chore: update flake inputs

Adds a guardrails submodule option to coding.agents.pi that:
- Generates ~/.pi/agent/extensions/guardrails.json when enabled
- Automatically injects @aliou/pi-guardrails package into settings.packages
- Provides structured options for policies, pathAccess, and permissionGate

The module generates the JSON config that pi-guardrails reads for
its security hooks (policies, permission-gate, path-access).

Limitations documented in option descriptions:
- Path access checks are lexical (not symlink-safe)
- Local project guardrails.json can override global rule IDs

.beads/.gitignore

@@ -0,0 +1,73 @@
+# Dolt database (managed by Dolt, not git)
+dolt/
+embeddeddolt/
+
+# Runtime files
+bd.sock
+bd.sock.startlock
+sync-state.json
+last-touched
+.exclusive-lock
+
+# Daemon runtime (lock, log, pid)
+daemon.*
+
+# Interactions log (runtime, not versioned)
+interactions.jsonl
+
+# Push state (runtime, per-machine)
+push-state.json
+
+# Lock files (various runtime locks)
+*.lock
+
+# Credential key (encryption key for federation peer auth — never commit)
+.beads-credential-key
+
+# Local version tracking (prevents upgrade notification spam after git ops)
+.local_version
+
+# Worktree redirect file (contains relative path to main repo's .beads/)
+# Must not be committed as paths would be wrong in other clones
+redirect
+
+# Sync state (local-only, per-machine)
+# These files are machine-specific and should not be shared across clones
+.sync.lock
+export-state/
+export-state.json
+
+# Ephemeral store (SQLite - wisps/molecules, intentionally not versioned)
+ephemeral.sqlite3
+ephemeral.sqlite3-journal
+ephemeral.sqlite3-wal
+ephemeral.sqlite3-shm
+
+# Dolt server management (auto-started by bd)
+dolt-server.pid
+dolt-server.log
+dolt-server.lock
+dolt-server.port
+dolt-server.activity
+
+# Corrupt backup directories (created by bd doctor --fix recovery)
+*.corrupt.backup/
+
+# Backup data (auto-exported JSONL, local-only)
+backup/
+
+# Per-project environment file (Dolt connection config, GH#2520)
+.env
+
+# Legacy files (from pre-Dolt versions)
+*.db
+*.db?*
+*.db-journal
+*.db-wal
+*.db-shm
+db.sqlite
+bd.db
+# NOTE: Do NOT add negation patterns here.
+# They would override fork protection in .git/info/exclude.
+# Config files (metadata.json, config.yaml) are tracked by git by default
+# since no pattern above ignores them.

.beads/README.md

@@ -0,0 +1,81 @@
+# Beads - AI-Native Issue Tracking
+
+Welcome to Beads! This repository uses **Beads** for issue tracking - a modern, AI-native tool designed to live directly in your codebase alongside your code.
+
+## What is Beads?
+
+Beads is issue tracking that lives in your repo, making it perfect for AI coding agents and developers who want their issues close to their code. No web UI required - everything works through the CLI and integrates seamlessly with git.
+
+**Learn more:** [github.com/steveyegge/beads](https://github.com/steveyegge/beads)
+
+## Quick Start
+
+### Essential Commands
+
+```bash
+# Create new issues
+bd create "Add user authentication"
+
+# View all issues
+bd list
+
+# View issue details
+bd show <issue-id>
+
+# Update issue status
+bd update <issue-id> --claim
+bd update <issue-id> --status done
+
+# Sync with Dolt remote
+bd dolt push
+```
+
+### Working with Issues
+
+Issues in Beads are:
+- **Git-native**: Stored in Dolt database with version control and branching
+- **AI-friendly**: CLI-first design works perfectly with AI coding agents
+- **Branch-aware**: Issues can follow your branch workflow
+- **Always in sync**: Auto-syncs with your commits
+
+## Why Beads?
+
+✨ **AI-Native Design**
+- Built specifically for AI-assisted development workflows
+- CLI-first interface works seamlessly with AI coding agents
+- No context switching to web UIs
+
+🚀 **Developer Focused**
+- Issues live in your repo, right next to your code
+- Works offline, syncs when you push
+- Fast, lightweight, and stays out of your way
+
+🔧 **Git Integration**
+- Automatic sync with git commits
+- Branch-aware issue tracking
+- Dolt-native three-way merge resolution
+
+## Get Started with Beads
+
+Try Beads in your own projects:
+
+```bash
+# Install Beads
+curl -sSL https://raw.githubusercontent.com/steveyegge/beads/main/scripts/install.sh | bash
+
+# Initialize in your repo
+bd init
+
+# Create your first issue
+bd create "Try out Beads"
+```
+
+## Learn More
+
+- **Documentation**: [github.com/steveyegge/beads/docs](https://github.com/steveyegge/beads/tree/main/docs)
+- **Quick Start Guide**: Run `bd quickstart`
+- **Examples**: [github.com/steveyegge/beads/examples](https://github.com/steveyegge/beads/tree/main/examples)
+
+---
+
+*Beads: Issue tracking that moves at the speed of thought* ⚡

.beads/config.yaml

@@ -0,0 +1,56 @@
+# Beads Configuration File
+# This file configures default behavior for all bd commands in this repository
+# All settings can also be set via environment variables (BD_* prefix)
+# or overridden with command-line flags
+
+# Issue prefix for this repository (used by bd init)
+# If not set, bd init will auto-detect from directory name
+# Example: issue-prefix: "myproject" creates issues like "myproject-1", "myproject-2", etc.
+# issue-prefix: ""
+
+# Use no-db mode: JSONL-only, no Dolt database
+# When true, bd will use .beads/issues.jsonl as the source of truth
+# no-db: false
+
+# Enable JSON output by default
+# json: false
+
+# Feedback title formatting for mutating commands (create/update/close/dep/edit)
+# 0 = hide titles, N > 0 = truncate to N characters
+# output:
+#   title-length: 255
+
+# Default actor for audit trails (overridden by BEADS_ACTOR or --actor)
+# actor: ""
+
+# Export events (audit trail) to .beads/events.jsonl on each flush/sync
+# When enabled, new events are appended incrementally using a high-water mark.
+# Use 'bd export --events' to trigger manually regardless of this setting.
+# events-export: false
+
+# Multi-repo configuration (experimental - bd-307)
+# Allows hydrating from multiple repositories and routing writes to the correct database
+# repos:
+#   primary: "."  # Primary repo (where this database lives)
+#   additional:   # Additional repos to hydrate from (read-only)
+#     - ~/beads-planning  # Personal planning repo
+#     - ~/work-planning   # Work planning repo
+
+# JSONL backup (periodic export for off-machine recovery)
+# Auto-enabled when a git remote exists. Override explicitly:
+# backup:
+#   enabled: false     # Disable auto-backup entirely
+#   interval: 15m      # Minimum time between auto-exports
+#   git-push: false    # Disable git push (export locally only)
+#   git-repo: ""       # Separate git repo for backups (default: project repo)
+
+# Integration settings (access with 'bd config get/set')
+# These are stored in the database, not in this file:
+# - jira.url
+# - jira.project
+# - linear.url
+# - linear.api-key
+# - github.org
+# - github.repo
+
+sync.remote: "git+ssh://gitea@code.m3ta.dev/m3tam3re/nixpkgs.git"

.beads/hooks/post-checkout

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+# --- BEGIN BEADS INTEGRATION v1.0.2 ---
+# This section is managed by beads. Do not remove these markers.
+if command -v bd >/dev/null 2>&1; then
+  export BD_GIT_HOOK=1
+  _bd_timeout=${BEADS_HOOK_TIMEOUT:-300}
+  if command -v timeout >/dev/null 2>&1; then
+    timeout "$_bd_timeout" bd hooks run post-checkout "$@"
+    _bd_exit=$?
+    if [ $_bd_exit -eq 124 ]; then
+      echo >&2 "beads: hook 'post-checkout' timed out after ${_bd_timeout}s — continuing without beads"
+      _bd_exit=0
+    fi
+  else
+    bd hooks run post-checkout "$@"
+    _bd_exit=$?
+  fi
+  if [ $_bd_exit -eq 3 ]; then
+    echo >&2 "beads: database not initialized — skipping hook 'post-checkout'"
+    _bd_exit=0
+  fi
+  if [ $_bd_exit -ne 0 ]; then exit $_bd_exit; fi
+fi
+# --- END BEADS INTEGRATION v1.0.2 ---

.beads/hooks/post-merge

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+# --- BEGIN BEADS INTEGRATION v1.0.2 ---
+# This section is managed by beads. Do not remove these markers.
+if command -v bd >/dev/null 2>&1; then
+  export BD_GIT_HOOK=1
+  _bd_timeout=${BEADS_HOOK_TIMEOUT:-300}
+  if command -v timeout >/dev/null 2>&1; then
+    timeout "$_bd_timeout" bd hooks run post-merge "$@"
+    _bd_exit=$?
+    if [ $_bd_exit -eq 124 ]; then
+      echo >&2 "beads: hook 'post-merge' timed out after ${_bd_timeout}s — continuing without beads"
+      _bd_exit=0
+    fi
+  else
+    bd hooks run post-merge "$@"
+    _bd_exit=$?
+  fi
+  if [ $_bd_exit -eq 3 ]; then
+    echo >&2 "beads: database not initialized — skipping hook 'post-merge'"
+    _bd_exit=0
+  fi
+  if [ $_bd_exit -ne 0 ]; then exit $_bd_exit; fi
+fi
+# --- END BEADS INTEGRATION v1.0.2 ---

.beads/hooks/pre-commit

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+# --- BEGIN BEADS INTEGRATION v1.0.2 ---
+# This section is managed by beads. Do not remove these markers.
+if command -v bd >/dev/null 2>&1; then
+  export BD_GIT_HOOK=1
+  _bd_timeout=${BEADS_HOOK_TIMEOUT:-300}
+  if command -v timeout >/dev/null 2>&1; then
+    timeout "$_bd_timeout" bd hooks run pre-commit "$@"
+    _bd_exit=$?
+    if [ $_bd_exit -eq 124 ]; then
+      echo >&2 "beads: hook 'pre-commit' timed out after ${_bd_timeout}s — continuing without beads"
+      _bd_exit=0
+    fi
+  else
+    bd hooks run pre-commit "$@"
+    _bd_exit=$?
+  fi
+  if [ $_bd_exit -eq 3 ]; then
+    echo >&2 "beads: database not initialized — skipping hook 'pre-commit'"
+    _bd_exit=0
+  fi
+  if [ $_bd_exit -ne 0 ]; then exit $_bd_exit; fi
+fi
+# --- END BEADS INTEGRATION v1.0.2 ---

.beads/hooks/pre-push

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+# --- BEGIN BEADS INTEGRATION v1.0.2 ---
+# This section is managed by beads. Do not remove these markers.
+if command -v bd >/dev/null 2>&1; then
+  export BD_GIT_HOOK=1
+  _bd_timeout=${BEADS_HOOK_TIMEOUT:-300}
+  if command -v timeout >/dev/null 2>&1; then
+    timeout "$_bd_timeout" bd hooks run pre-push "$@"
+    _bd_exit=$?
+    if [ $_bd_exit -eq 124 ]; then
+      echo >&2 "beads: hook 'pre-push' timed out after ${_bd_timeout}s — continuing without beads"
+      _bd_exit=0
+    fi
+  else
+    bd hooks run pre-push "$@"
+    _bd_exit=$?
+  fi
+  if [ $_bd_exit -eq 3 ]; then
+    echo >&2 "beads: database not initialized — skipping hook 'pre-push'"
+    _bd_exit=0
+  fi
+  if [ $_bd_exit -ne 0 ]; then exit $_bd_exit; fi
+fi
+# --- END BEADS INTEGRATION v1.0.2 ---

.beads/hooks/prepare-commit-msg

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+# --- BEGIN BEADS INTEGRATION v1.0.2 ---
+# This section is managed by beads. Do not remove these markers.
+if command -v bd >/dev/null 2>&1; then
+  export BD_GIT_HOOK=1
+  _bd_timeout=${BEADS_HOOK_TIMEOUT:-300}
+  if command -v timeout >/dev/null 2>&1; then
+    timeout "$_bd_timeout" bd hooks run prepare-commit-msg "$@"
+    _bd_exit=$?
+    if [ $_bd_exit -eq 124 ]; then
+      echo >&2 "beads: hook 'prepare-commit-msg' timed out after ${_bd_timeout}s — continuing without beads"
+      _bd_exit=0
+    fi
+  else
+    bd hooks run prepare-commit-msg "$@"
+    _bd_exit=$?
+  fi
+  if [ $_bd_exit -eq 3 ]; then
+    echo >&2 "beads: database not initialized — skipping hook 'prepare-commit-msg'"
+    _bd_exit=0
+  fi
+  if [ $_bd_exit -ne 0 ]; then exit $_bd_exit; fi
+fi
+# --- END BEADS INTEGRATION v1.0.2 ---

.beads/issues.jsonl

@@ -0,0 +1 @@
+{"id":"nixpkgs-ng1","title":"Configure agent git identity in nixpkgs repo","description":"Git commits are using p@m3ta.dev instead of m3ta-chiron@agentmail.to. The GIT_AUTHOR_NAME and GIT_AUTHOR_EMAIL environment variables are not set in this environment. Need to configure the agent git identity for this repository following the pattern in AGENTS.md","status":"open","priority":2,"issue_type":"task","owner":"p@m3ta.dev","created_at":"2026-04-27T18:16:17Z","created_by":"m3tm3re","updated_at":"2026-04-27T18:16:17Z","dependency_count":0,"dependent_count":0,"comment_count":0}

.beads/metadata.json

@@ -0,0 +1,7 @@
+{
+  "database": "dolt",
+  "backend": "dolt",
+  "dolt_mode": "embedded",
+  "dolt_database": "nixpkgs",
+  "project_id": "b57a167a-6526-4211-a6c1-51686e431912"
+}

.gitignore

@@ -43,3 +43,10 @@ flake.lock.bak
 .sidecar-start.sh
 .sidecar-base
 .td-root
+.cache
+.pi*
+
+# Beads / Dolt files (added by bd init)
+.dolt/
+*.db
+.beads-credential-key

.pi-lens/cache/jscpd.json

@@ -1,7 +0,0 @@
-{
-  "success": true,
-  "clones": [],
-  "duplicatedLines": 0,
-  "totalLines": 0,
-  "percentage": 0
-}

.pi-lens/cache/jscpd.meta.json

@@ -1,3 +0,0 @@
-{
-  "timestamp": "2026-04-11T04:17:20.531Z"
-}

.pi-lens/cache/knip.json

@@ -1,9 +0,0 @@
-{
-  "success": false,
-  "issues": [],
-  "unusedExports": [],
-  "unusedFiles": [],
-  "unusedDeps": [],
-  "unlistedDeps": [],
-  "summary": "Failed to parse output"
-}

.pi-lens/cache/knip.meta.json

@@ -1,3 +0,0 @@
-{
-  "timestamp": "2026-04-11T04:17:21.374Z"
-}

.pi-lens/cache/session-start-guidance.json

@@ -1,3 +0,0 @@
-{
-  "content": "📌 pi-lens active — as you work on this project, fix any errors you encounter (including pre-existing). Prefer: lsp_navigation for definitions/references, ast_grep_search for code patterns, grep for text/TODO search."
-}

.pi-lens/cache/session-start-guidance.meta.json

@@ -1,3 +0,0 @@
-{
-  "timestamp": "2026-04-11T04:21:36.939Z"
-}

.pi-lens/cache/todo-baseline.json

@@ -1,3 +0,0 @@
-{
-  "items": []
-}

.pi-lens/cache/todo-baseline.meta.json

@@ -1,3 +0,0 @@
-{
-  "timestamp": "2026-04-11T04:21:36.940Z"
-}

.pi-lens/turn-state.json

@@ -1,6 +0,0 @@
-{
-  "files": {},
-  "turnCycles": 0,
-  "maxCycles": 3,
-  "lastUpdated": "2026-04-11T04:17:22.397Z"
-}

.td-root

@@ -1 +0,0 @@
-/home/sascha.koenig/p/NIX/nixpkgs

AGENTS.md

@@ -1,225 +1,84 @@
-# m3ta-nixpkgs Knowledge Base
+# Agent Instructions
 
-## MANDATORY: Use td for Task Management
+This project uses **bd** (beads) for issue tracking. Run `bd prime` for full workflow context.
 
-You must run td usage --new-session at conversation start (or after /clear) to see current work.
-Use td usage -q for subsequent reads.
-
-**Generated:** 2026-02-14
-**Commit:** dc2f3b6
-**Branch:** master
-
-## OVERVIEW
-
-Personal Nix flake: custom packages, overlays, NixOS/Home Manager modules, dev shells. Flakes-only (no channels).
-
-## STRUCTURE
-
-```
-.
-├── flake.nix              # Entry: packages, overlays, modules, shells, lib
-├── pkgs/                  # Custom packages (one dir each, callPackage registry)
-├── modules/
-│   ├── nixos/             # System modules (ports.nix)
-│   └── home-manager/      # User modules by category (cli/, coding/, ports.nix)
-├── lib/                   # Shared utilities (ports.nix)
-├── shells/                # Dev environments (default, python, devops)
-├── overlays/mods/         # Package modifications (n8n version bump)
-├── templates/             # Boilerplate for new packages/modules
-├── examples/              # Usage examples
-└── .gitea/workflows/     # CI/CD workflows (nix-update automation)
-```
-
-## WHERE TO LOOK
-
-| Task                 | Location                           | Notes                                 |
-| -------------------- | ---------------------------------- | ------------------------------------- |
-| Add package          | `pkgs/<name>/default.nix`          | Register in `pkgs/default.nix`        |
-| Add NixOS module     | `modules/nixos/<name>.nix`         | Import in `modules/nixos/default.nix` |
-| Add HM module        | `modules/home-manager/<category>/` | Category: cli, coding, or root        |
-| Override nixpkgs pkg | `overlays/mods/<name>.nix`         | Import in `overlays/mods/default.nix` |
-| Add dev shell        | `shells/<name>.nix`                | Register in `shells/default.nix`      |
-| Use port management  | `config.m3ta.ports.get "service"`  | Host-specific via `hostOverrides`     |
-| CI/CD workflows      | `.gitea/workflows/<name>.yml`      | Automated package updates (nix-update) |
-
-## CONVENTIONS
-
-**Formatter**: `nix fmt` before commit (alejandra)
-
-**Naming**:
-
-- Packages: `lowercase-hyphen` (e.g., `hyprpaper-random`)
-- Variables: `camelCase` (e.g., `portHelpers`)
-- Module options: `m3ta.*` namespace
-
-**Imports**: Multi-line, trailing commas:
-
-```nix
-{
-  lib,
-  stdenv,
-  fetchFromGitHub,
-}:
-```
-
-**Modules**: Standard pattern:
-
-```nix
-{ config, lib, pkgs, ... }:
-with lib; let
-  cfg = config.m3ta.myModule;
-in {
-  options.m3ta.myModule = {
-    enable = mkEnableOption "description";
-  };
-  config = mkIf cfg.enable { ... };
-}
-```
-
-**Meta**: Always include all fields:
-
-```nix
-meta = with lib; {
-  description = "...";
-  homepage = "...";
-  license = licenses.mit;
-  platforms = platforms.linux;
-  mainProgram = "...";
-};
-```
-
-## PACKAGE PATTERNS
-
-**Rust**: `rustPlatform.buildRustPackage rec { cargoLock.lockFile = src + "/Cargo.lock"; }`
-
-**Shell**: `writeShellScriptBin "name" ''script''` or `mkDerivation` with custom `installPhase`
-
-**AppImage**: `appimageTools.wrapType2 { ... }`
-
-**Custom fetcher**: `fetchFromGitea { domain = "code.m3ta.dev"; owner = "m3tam3re"; ... }`
-
-## MODULE PATTERNS
-
-**Simple**: `options.cli.name = { enable = mkEnableOption "..."; }; config = mkIf cfg.enable { ... };`
-
-**Multiple**: `config = mkMerge [ (mkIf cfg.x.enable { ... }) (mkIf cfg.y.enable { ... }) ];`
-
-**Shared lib**: `portsLib = import ../../lib/ports.nix { inherit lib; }; portHelpers = portsLib.mkPortHelpers { ... };`
-
-## LIBRARY FUNCTIONS
-
-### `lib.ports`
-
-Port management utilities. See [Port Management](#port-management).
-
-### `lib.agents`
-
-Harness-agnostic agent management. Reads canonical `agent.toml` from the AGENTS
-flake input and renders tool-specific configs.
-
-**Functions:**
-
-| Function | Purpose |
-|----------|--------|
-| `loadCanonical { agentsInput }` | Load canonical agents from AGENTS flake |
-| `renderForOpencode { pkgs, canonical, modelOverrides }` | Render to OpenCode file-based agents |
-| `renderForClaudeCode { pkgs, canonical, modelOverrides }` | Render to Claude Code agents + settings.json |
-| `renderForPi { pkgs, canonical }` | Render to Pi AGENTS.md + SYSTEM.md |
-| `renderForTool { pkgs, agentsInput, tool, modelOverrides }` | Dispatch to correct renderer |
-| `shellHookForTool { pkgs, agentsInput, tool, modelOverrides }` | Generate devShell shellHook |
-
-### `lib.coding-rules`
-
-Coding rules injection (renamed from `lib.opencode-rules`). The old name still works.
-
-| Function | Purpose |
-|----------|--------|
-| `mkCodingRules { agents, languages, concerns, frameworks }` | Generate rules config + shellHook |
-| `mkOpencodeRules` | Backward-compat alias for `mkCodingRules` |
-
-## PORT MANAGEMENT
-
-Central port management: `config.m3ta.ports.get "service"` with host-specific via `hostOverrides`
-
-Generated: `/etc/m3ta/ports.json` (NixOS), `~/.config/m3ta/ports.json` (HM)
-
-## COMMANDS
+## Quick Reference
 
 ```bash
-nix flake check              # Validate flake
-nix fmt                      # Format (alejandra)
-nix build .#<pkg>            # Build package
-nix flake show               # List outputs
-nix develop                  # Enter dev shell
-nix develop .#python         # Python shell
-nix develop .#devops         # DevOps shell
-
-# In dev shell only:
-statix check .               # Lint
-deadnix .                    # Find dead code
+bd ready              # Find available work
+bd show <id>          # View issue details
+bd update <id> --claim  # Claim work atomically
+bd close <id>         # Complete work
+bd dolt push          # Push beads data to remote
 ```
 
-## ANTI-PATTERNS
+## Non-Interactive Shell Commands
 
-| Don't                     | Do Instead                                                          |
-| ------------------------- | ------------------------------------------------------------------- |
-| `lib.fakeHash` in commits | Get real hash: `nix build`, copy from error                         |
-| Flat module files         | Organize by category (`cli/`, `coding/`)                            |
-| Hardcode ports            | Use `m3ta.ports` module                                             |
-| Skip meta fields          | Include all: description, homepage, license, platforms, mainProgram |
-| `with pkgs;` in modules   | Explicit `pkgs.package` or `with pkgs; [ ... ]` in lists only       |
+**ALWAYS use non-interactive flags** with file operations to avoid hanging on confirmation prompts.
 
-## COMMIT FORMAT
+Shell commands like `cp`, `mv`, and `rm` may be aliased to include `-i` (interactive) mode on some systems, causing the agent to hang indefinitely waiting for y/n input.
 
-```
-type: brief description
+**Use these forms instead:**
+```bash
+# Force overwrite without prompting
+cp -f source dest           # NOT: cp source dest
+mv -f source dest           # NOT: mv source dest
+rm -f file                  # NOT: rm file
+
+# For recursive operations
+rm -rf directory            # NOT: rm -r directory
+cp -rf source dest          # NOT: cp -r source dest
 ```
 
-Types: `feat`, `fix`, `docs`, `style`, `refactor`, `chore`
+**Other commands that may prompt:**
+- `scp` - use `-o BatchMode=yes` for non-interactive
+- `ssh` - use `-o BatchMode=yes` to fail instead of prompting
+- `apt-get` - use `-y` flag
+- `brew` - use `HOMEBREW_NO_AUTO_UPDATE=1` env var
 
-## NOTES
+<!-- BEGIN BEADS INTEGRATION v:1 profile:minimal hash:ca08a54f -->
+## Beads Issue Tracker
 
-- **Hash fetching**: Use `lib.fakeHash` initially, build to get real hash
-- **HM modules**: Category subdirs (`cli/`, `coding/`) have own `default.nix` aggregators
-- **Ports module**: Different for NixOS vs HM (HM adds `generateEnvVars` option)
-- **Overlays**: `modifications` overlay uses `{prev}:` pattern, not `{final, prev}:`
-- **Dev shell tools**: `statix`, `deadnix` only available inside `nix develop`
-- **Automated package updates**: Packages are automatically updated weekly via Gitea Actions using `nix-update`. Review PRs from the automation before merging. For urgent updates, manually run the workflow or update manually.
+This project uses **bd (beads)** for issue tracking. Run `bd prime` to see full workflow context and commands.
 
-## Task Management
+### Quick Reference
 
-This project uses **td** for tracking tasks across AI coding sessions.
-Run `td usage --new-session` at conversation start to see current work.
-Use `td usage -q` for subsequent reads.
+```bash
+bd ready              # Find available work
+bd show <id>          # View issue details
+bd update <id> --claim  # Claim work
+bd close <id>         # Complete work
+```
 
-**Quick reference:**
+### Rules
 
-- `td usage --new-session` - Start new session and view tasks
-- `td usage -q` - Quick view of current tasks (subsequent reads)
-- `td version` - Check version
+- Use `bd` for ALL task tracking — do NOT use TodoWrite, TaskCreate, or markdown TODO lists
+- Run `bd prime` for detailed command reference and session close protocol
+- Use `bd remember` for persistent knowledge — do NOT use MEMORY.md files
 
-For full workflow details, see the [td documentation](./docs/packages/td.md).
+## Session Completion
 
-## MIGRATION: Agent System (OpenCode → Canonical TOML)
+**When ending a work session**, you MUST complete ALL steps below. Work is NOT complete until `git push` succeeds.
 
-The agent system was migrated from embedded `agents.json` to harness-agnostic
-canonical `agent.toml` + `system-prompt.md` in the AGENTS repo. Renderers in
-`lib/agents.nix` generate tool-specific configs.
+**MANDATORY WORKFLOW:**
 
-### What changed in this repo
+1. **File issues for remaining work** - Create issues for anything that needs follow-up
+2. **Run quality gates** (if code changed) - Tests, linters, builds
+3. **Update issue status** - Close finished work, update in-progress items
+4. **PUSH TO REMOTE** - This is MANDATORY:
+   ```bash
+   git pull --rebase
+   bd dolt push
+   git push
+   git status  # MUST show "up to date with origin"
+   ```
+5. **Clean up** - Clear stashes, prune remote branches
+6. **Verify** - All changes committed AND pushed
+7. **Hand off** - Provide context for next session
 
-- **`lib/agents.nix`**: New — 3 renderers (OpenCode, Claude Code, Pi) + dispatcher + shellHook
-- **`lib/coding-rules.nix`**: Renamed from `opencode-rules.nix`, `mkCodingRules` replaces `mkOpencodeRules`
-- **`modules/home-manager/coding/agents/`**: New — per-tool HM sub-modules
-- **`modules/home-manager/coding/opencode.nix`**: Slimmed — no longer handles agents/skills/context
-- **`flake.nix`**: Exports new `agents` HM module
-
-### What the user must do
-
-See `modules/home-manager/AGENTS.md` for the full migration guide. Summary:
-
-1. Move `agentsInput`/`externalSkills` from `coding.opencode` to `coding.agents.opencode`
-2. Add `modelOverrides` with previously hardcoded model strings
-3. Run `home-manager switch`
-4. Remove legacy `agents.json` + `prompts/*.txt` from AGENTS repo
-5. Remove `lib.agentsJson` backward-compat bridge from AGENTS `flake.nix`
+**CRITICAL RULES:**
+- Work is NOT complete until `git push` succeeds
+- NEVER stop before pushing - that leaves work stranded locally
+- NEVER say "ready to push when you are" - YOU must push
+- If push fails, resolve and retry until it succeeds
+<!-- END BEADS INTEGRATION -->

CHANGELOG.md

@@ -0,0 +1,108 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+The format is based on [Keep a Changelog](https://keepachangelog.com/).
+
+## [Unreleased]
+
+### Changed
+- Remove duplicate opencode-rules.nix (backward-compat alias preserved)
+- Tool-agnostic naming in coding-rules lib internals
+- Remove redundant overlay entries for non-existent flake inputs
+- Remove redundant 'additions' overlay (identical to 'default')
+
+### Removed
+- Dead overlay entries for non-existent flake inputs
+- Legacy `mkOpencodeRules` alias and `lib.opencode-rules` backward-compat entry (use `mkCodingRules` / `lib.coding-rules`)
+
+## [0.4.0] - 2026-04-15
+
+### Added
+- Pi-agent wrapper with systemd sandbox and per-host-user policy
+- Containerized Pi agent
+- `lib.agents.nix` with loadCanonical, renderers (OpenCode, Claude Code, Pi), and shellHook
+- `lib.coding-rules` helper for per-project rule injection (renamed from opencode-rules)
+- Home Manager modules for coding agents: `claude-code`, `opencode`, `pi`
+- Agents rework with canonical TOML format and harness-agnostic renderers
+- `vibetyper` and `eigent` packages
+- `openspec` package
+- `basecamp-cli` package
+- `openshell` package (0.0.14 through 0.0.23)
+- `openwork` package
+- Opencode config moved into m3ta-nixpkgs
+- Opencode dev shell with mkCodingRules demo
+
+### Changed
+- OpenCode flake input updated through v1.1.65 to v1.3.6
+- Switched from local opencode package to upstream flake input
+- Removed opencode-desktop (awaiting upstream fix), later re-enabled
+- Nix eval warnings resolved
+- Flake inputs updated throughout
+
+### Fixed
+- Pi settings sync
+- Remove openwork sidecars in preFixup to prevent .opencode-wrapped conflict
+- Remove sidecar binaries from openwork $out/bin to fix buildEnv conflict
+- Vibetyper .desktop entry
+- Opencode module formatting
+- Formatting opencode module
+
+## [0.3.0] - 2026-02-20
+
+### Added
+- `notesmd-cli` package with flake checks
+- `sidecar` and `td` packages
+- `opencode-desktop` package with Wayland support
+- `mem0` package (1.0.2 through 1.0.9)
+- `kestracli` / `kestractl` package (1.0.0 to 1.2.2)
+
+### Changed
+- Nix-update CI workflow optimized with caching and parallel processing
+- Restructured n8n version handling for nix-update compatibility
+- Switched formatter from nixpkgs-fmt to alejandra
+- Replace local opencode with upstream flake input v1.1.27
+
+### Fixed
+- n8n build error
+- n8n pnpm hash
+- n8n update script
+- Gitea runner opencode.url flake input
+- nix-update workflow: YAML syntax, jobs indentation, PR body formatting
+- Arithmetic increment failing with set -e in nix-update workflow
+- Removed magic-nix-cache-action causing platform mapping error
+- Opencode bun version requirement patched to match upstream lockfile
+- Deprecated opencode update logic removed
+- nix fmt without arg in workflow
+- Extra Lua config renamed initLua
+- Stt-ptt use pkill for better process management
+
+## [0.2.0] - 2026-01-13
+
+### Added
+- Gitea Actions workflow for automated package updates with nix-update
+- `n8n`, `beads`, and `opencode` packages
+- `stt-ptt` package with auto-language detection
+- `rofi-project-opener` for rofi-based project launching
+- Hierarchical AGENTS.md knowledge base
+- Dev shell structure with python and devops shells
+- Port management modules (NixOS + Home Manager)
+- Port helper library (`lib/ports.nix`)
+
+### Changed
+- Beads updated through v0.49.1
+- N8n updated through v2.8.1
+- Opencode updated through v1.1.18
+- Documentation expanded with comprehensive patterns and HM module docs
+
+### Fixed
+- Python env version fix for marimo
+
+## [0.1.0] - 2025-10-04
+
+### Added
+- Initial flake setup with packages, overlays, modules, and shells
+- NixOS and Home Manager module infrastructure
+- `lib/` shared utilities
+- `overlays/mods/` for package modifications
+- `templates/` for new packages/modules
+- `examples/` for usage documentation

README.md

@@ -38,24 +38,16 @@ nix run git+https://code.m3ta.dev/m3tam3re/nixpkgs#zellij-ps
 
 ## Available Packages
 
-| Package            | Description                           |
-| ------------------ | ------------------------------------- |
-| `code2prompt`      | Convert code to prompts               |
-| `hyprpaper-random` | Random wallpaper setter for Hyprpaper |
-| `kestractl`        | CLI for the Kestra workflow orchestration platform |
-| `launch-webapp`    | Launch web applications               |
-| `mem0`             | AI memory assistant with vector storage |
-| `msty-studio`      | Msty Studio application               |
-| `n8n`              | Free and source-available fair-code licensed workflow automation tool |
-| `notesmd-cli`      | Obsidian CLI (Community) - Interact with Obsidian in the terminal |
-| `opencode-desktop` | OpenCode Desktop App with Wayland support (includes workaround for upstream issue #11755) |
-| `pomodoro-timer`   | Pomodoro timer utility                |
-| `rofi-project-opener` | Rofi-based project launcher        |
-| `sidecar`          | Companion tool for CLI agents with diffs, file trees, and task management |
-| `stt-ptt`          | Push to Talk Speech to Text           |
-| `td`               | Minimalist CLI for tracking tasks across AI coding sessions |
-| `tuxedo-backlight` | Backlight control for Tuxedo laptops  |
-| `zellij-ps`        | Project switcher for Zellij           |
+See [📦 Packages](./docs/packages/) for the full index with descriptions.
+
+Quick reference — build any package directly:
+
+```bash
+nix build git+https://code.m3ta.dev/m3tam3re/nixpkgs#<package-name>
+nix run git+https://code.m3ta.dev/m3tam3re/nixpkgs#<package-name>
+```
+
+Notable packages: `sidecar`, `td`, `code2prompt`, `mem0`, `n8n`, `zellij-ps`.
 
 ## Automated Package Updates
 

docs/README.md

@@ -20,29 +20,16 @@ Step-by-step guides for common tasks:
 
 - [Getting Started](./guides/getting-started.md) - Initial setup and basic usage
 - [Adding Packages](./guides/adding-packages.md) - How to add new packages
+- [Adding Modules](./guides/adding-modules.md) - How to add new NixOS or Home Manager modules
 - [Port Management](./guides/port-management.md) - Managing service ports across hosts
 - [Using Modules](./guides/using-modules.md) - Using NixOS and Home Manager modules
 - [Development Workflow](./guides/development-workflow.md) - Development and testing workflow
 
 ### 📦 Packages
 
-Documentation for all custom packages:
-
-- [code2prompt](./packages/code2prompt.md) - Convert code to prompts
-- [hyprpaper-random](./packages/hyprpaper-random.md) - Random wallpaper setter for Hyprpaper
-- [kestractl](./packages/kestractl.md) - CLI for the Kestra workflow orchestration platform
-- [launch-webapp](./packages/launch-webapp.md) - Launch web applications
-- [mem0](./packages/mem0.md) - AI memory assistant with vector storage
-- [msty-studio](./packages/msty-studio.md) - Msty Studio application
-- [n8n](./packages/n8n.md) - Free and source-available fair-code licensed workflow automation tool
-- [notesmd-cli](./packages/notesmd-cli.md) - Obsidian CLI (Community) - Interact with Obsidian in the terminal
-- [pomodoro-timer](./packages/pomodoro-timer.md) - Pomodoro timer utility
-- [rofi-project-opener](./packages/rofi-project-opener.md) - Rofi-based project launcher with custom args
-- [sidecar](./packages/sidecar.md) - Companion tool for CLI agents with diffs, file trees, and task management
-- [stt-ptt](./packages/stt-ptt.md) - Push to Talk Speech to Text using Whisper
-- [td](./packages/td.md) - Minimalist CLI for tracking tasks across AI coding sessions
-- [tuxedo-backlight](./packages/tuxedo-backlight.md) - Backlight control for Tuxedo laptops
-- [zellij-ps](./packages/zellij-ps.md) - Project switcher for Zellij
+- [Packages Index](./packages/) - All packages with descriptions
+- [Adding Packages](../guides/adding-packages.md) - How to add new packages
+- [Templates](../templates.md) - Boilerplate templates
 
 ### ⚙️ Modules
 
@@ -68,6 +55,7 @@ Technical references and APIs:
 
 - [Functions](./reference/functions.md) - Library functions documentation
 - [Patterns](./reference/patterns.md) - Code patterns and anti-patterns
+- [Templates](../templates.md) - Boilerplate for packages and modules
 
 ## Repository Structure
 

docs/guides/adding-modules.md

@@ -0,0 +1,261 @@
+# Adding Modules Guide
+
+How to add new NixOS and Home Manager modules to m3ta-nixpkgs.
+
+## Overview
+
+Modules extend your system or user configuration with reusable, declarative options. m3ta-nixpkgs uses the standard NixOS module system with a `m3ta.*` namespace.
+
+## Quick Start
+
+Use a template for quick setup:
+
+```bash
+# NixOS module
+nix flake init -t .#nixos-module my-module
+
+# Home Manager module
+nix flake init -t .#home-manager-module my-module
+```
+
+This copies the template into `templates/` — move it to the appropriate location and customize.
+
+## Adding a NixOS Module
+
+### 1. Create the Module File
+
+Create `modules/nixos/<my-module>.nix`:
+
+```nix
+{config, lib, pkgs, ...}:
+with lib; let
+  cfg = config.m3ta.myModule;
+in {
+  options.m3ta.myModule = {
+    enable = mkEnableOption "my module description";
+    # Add custom options here
+    someOption = mkOption {
+      type = types.str;
+      default = "default-value";
+      description = "Description of this option";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    # System configuration goes here
+    environment.systemPackages = [pkgs.some-package];
+
+    # Or systemd services
+    systemd.services.my-service = {
+      enable = true;
+      description = "My service";
+      wantedBy = ["multi-user.target"];
+      serviceConfig = {
+        ExecStart = "${pkgs.some-package}/bin/some-daemon";
+      };
+    };
+  };
+}
+```
+
+### 2. Register in the Aggregator
+
+Add to `modules/nixos/default.nix`:
+
+```nix
+{
+  imports = [
+    ./ports.nix
+    ./mem0.nix
+    ./<my-module>.nix   # ← add your module
+  ];
+}
+```
+
+### 3. Export from flake.nix
+
+Add to the `nixosModules` output in `flake.nix` (optional, for direct import):
+
+```nix
+nixosModules = {
+  default = ./modules/nixos;
+  ports = ./modules/nixos/ports.nix;
+  mem0 = ./modules/nixos/mem0.nix;
+  my-module = ./modules/nixos/<my-module>.nix;  # ← add this
+};
+```
+
+## Adding a Home Manager Module
+
+Home Manager modules are organized by category under `modules/home-manager/`.
+
+### Categories
+
+| Category | Purpose | Location |
+|----------|---------|----------|
+| `cli/` | Command-line tools and utilities | `modules/home-manager/cli/` |
+| `coding/` | Development tools, editors, agents | `modules/home-manager/coding/` |
+| Root | Cross-cutting concerns (e.g., ports) | `modules/home-manager/` |
+
+### 1. Choose a Category
+
+- **CLI tools** (zsh plugins, tmux config, etc.) → `cli/`
+- **Development tools** (editor config, linters, etc.) → `coding/`
+- **System-wide settings** (ports, environment) → root level
+
+### 2. Create the Module File
+
+Create `modules/home-manager/<category>/<my-module>.nix`:
+
+```nix
+{config, lib, pkgs, ...}:
+with lib; let
+  cfg = config.m3ta.myModule;
+in {
+  options.m3ta.myModule = {
+    enable = mkEnableOption "my user module description";
+    someOption = mkOption {
+      type = types.str;
+      default = "value";
+      description = "An option for this module";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [pkgs.some-package];
+
+    # Or Home Manager-specific options
+    programs.zsh.enable = true;
+  };
+}
+```
+
+### 3. Register in the Category Aggregator
+
+For `cli/` modules, add to `modules/home-manager/cli/default.nix`:
+
+```nix
+{
+  imports = [
+    ./rofi-project-opener.nix
+    ./stt-ptt.nix
+    ./zellij-ps.nix
+    ./<my-module>.nix   # ← add your module
+  ];
+}
+```
+
+For `coding/` modules, add to `modules/home-manager/coding/default.nix`:
+
+```nix
+{
+  imports = [
+    ./editors.nix
+    ./opencode.nix
+    ./agents
+    ./<my-module>.nix   # ← add your module
+  ];
+}
+```
+
+### 4. Export from flake.nix
+
+Add to `homeManagerModules` in `flake.nix`:
+
+```nix
+homeManagerModules = {
+  default = import ./modules/home-manager;
+  my-module = import ./modules/home-manager/<category>/<my-module>.nix;  # ← add this
+};
+```
+
+## Module Patterns
+
+### Standard Enable Option
+
+Always start with `mkEnableOption`:
+
+```nix
+options.m3ta.myModule = {
+  enable = mkEnableOption "my module";
+};
+```
+
+### Conditional Configuration
+
+Use `mkIf` for conditional config:
+
+```nix
+config = mkIf cfg.enable {
+  # Only applied when enabled
+};
+```
+
+### Multiple Conditions
+
+Use `mkMerge` when combining multiple conditional blocks:
+
+```nix
+config = mkMerge [
+  (mkIf cfg.feature1.enable { ... })
+  (mkIf cfg.feature2.enable { ... })
+];
+```
+
+### Nested Namespaces
+
+For logically grouped options, use nested namespaces:
+
+```nix
+options.m3ta.coding = {
+  myTool = {
+    enable = mkEnableOption "my coding tool";
+    # ...
+  };
+};
+```
+
+Usage: `m3ta.coding.myTool.enable = true;`
+
+### Shared Library Functions
+
+For shared utilities (port helpers, etc.), import from `lib/`:
+
+```nix
+let
+  portsLib = import ../../lib/ports.nix {inherit lib;};
+  portHelpers = portsLib.mkPortHelpers { /* ... */ };
+in {
+  # use portHelpers
+}
+```
+
+## Documentation
+
+Add documentation for your module:
+
+1. Create `docs/modules/nixos/<my-module>.md` (NixOS) or `docs/modules/home-manager/<category>/<my-module>.md` (HM)
+2. Follow the existing format in `docs/modules/`
+3. Add it to the appropriate overview page's "Available Modules" list
+4. Link it from `docs/guides/using-modules.md`
+
+## Testing
+
+```bash
+# Validate the module loads correctly
+nix flake check
+
+# Test with a minimal configuration (NixOS)
+nixos-rebuild dry-build -I nixpkgs=. --option experimental-features flakes
+
+# Format before commit
+nix fmt
+```
+
+## Related
+
+- [Using Modules](./using-modules.md) - How to use existing modules
+- [Port Management](./port-management.md) - Centralized port management
+- [Development Workflow](./development-workflow.md) - Local development
+- [Adding Packages](./adding-packages.md) - Adding packages (not modules)
+- [Architecture](../ARCHITECTURE.md) - Repository structure

docs/guides/using-modules.md

@@ -662,5 +662,7 @@ nix eval .#nixosConfigurations.hostname.config.m3ta --apply builtins.attrNames
 
 - [Port Management](./port-management.md) - Detailed port management guide
 - [Adding Packages](./adding-packages.md) - How to add new packages
+- [Adding Modules](./adding-modules.md) - How to add new NixOS or Home Manager modules
+- [Templates](../templates.md) - Boilerplate for new packages and modules
 - [Architecture](../ARCHITECTURE.md) - Understanding module structure
 - [Contributing](../CONTRIBUTING.md) - Code style and guidelines

docs/packages/README.md

@@ -0,0 +1,53 @@
+# Packages
+
+Documentation for packages in m3ta-nixpkgs. Each package directory may contain a `README.md` with detailed documentation.
+
+## Index
+
+Packages are organized in `pkgs/<name>/`. Add a `README.md` inside a package directory to document it here.
+
+### Local Packages
+
+These packages are built from source in `pkgs/<name>/`:
+
+| Package | Description | Type | Location |
+|---------|-------------|------|----------|
+| `sidecar` | Companion tool for CLI agents with diffs, file trees, and task management | Go | `pkgs/sidecar/` |
+| `td` | Minimalist CLI for tracking tasks across AI coding sessions | Go | `pkgs/td/` |
+| `code2prompt` | Convert code to prompts | Go | `pkgs/code2prompt/` |
+| `eigent` | Eigenvalue tool | Python | `pkgs/eigent/` |
+| `hyprpaper-random` | Random wallpaper setter for Hyprpaper | Shell | `pkgs/hyprpaper-random/` |
+| `kestractl` | CLI for Kestra workflow orchestration | Go | `pkgs/kestractl/` |
+| `launch-webapp` | Launch web applications | Shell | `pkgs/launch-webapp/` |
+| `mem0` | AI memory assistant with vector storage | Python | `pkgs/mem0/` |
+| `msty-studio` | Msty Studio application | Python | `pkgs/msty-studio/` |
+| `n8n` | Workflow automation tool | Node.js | `pkgs/n8n/` |
+| `openshell` | AI shell assistant | Go | `pkgs/openshell/` |
+| `pomodoro-timer` | Pomodoro timer utility | Shell | `pkgs/pomodoro-timer/` |
+| `rofi-project-opener` | Rofi-based project launcher | Shell | `pkgs/rofi-project-opener/` |
+| `stt-ptt` | Push to Talk Speech to Text | Python | `pkgs/stt-ptt/` |
+| `tuxedo-backlight` | Backlight control for Tuxedo laptops | C | `pkgs/tuxedo-backlight/` |
+| `vibetyper` | Typing practice tool | Python | `pkgs/vibetyper/` |
+| `zellij-ps` | Project switcher for Zellij | Rust | `pkgs/zellij-ps/` |
+
+### Pass-Through Packages
+
+These packages are imported directly from flake inputs with minor modifications:
+
+| Package | Source | Modification | Location |
+|---------|--------|-------------|----------|
+| `opencode-desktop` | `inputs.opencode` | Tauri desktop wrapper + Wayland fix | `pkgs/opencode-desktop/` |
+
+## Adding Package Documentation
+
+To document a package in detail, add a `README.md` inside the package directory (e.g., `pkgs/sidecar/README.md`). This guide indexes all packages and provides a quick overview.
+
+## Automated Updates
+
+Packages are automatically updated weekly by the Gitea Actions `nix-update` workflow. See the main README for details.
+
+## Related
+
+- [Adding Packages](../guides/adding-packages.md) - How to add new packages
+- [Architecture](../ARCHITECTURE.md) - Repository structure
+- [Quick Start](../QUICKSTART.md) - Getting started

docs/packages/notesmd-cli.md

@@ -1,117 +0,0 @@
-# notesmd-cli
-
-Obsidian CLI (Community) - Interact with Obsidian in the terminal.
-
-## Description
-
-notesmd-cli is a command-line interface for interacting with Obsidian, the popular knowledge management and note-taking application. It allows you to create, search, and manipulate notes directly from the terminal.
-
-## Features
-
-- 📝 **Note Creation**: Create new notes from the command line
-- 🔍 **Search**: Search through your Obsidian vault
-- 📂 **Vault Management**: Interact with your vault structure
-- 🔗 **WikiLink Support**: Work with Obsidian's WikiLink format
-- 🏷️ **Tag Support**: Manage and search by tags
-- ⚡ **Fast**: Lightweight Go binary with no external dependencies
-
-## Installation
-
-### Via Overlay
-
-```nix
-{pkgs, ...}: {
-  environment.systemPackages = with pkgs; [
-    notesmd-cli
-  ];
-}
-```
-
-### Direct Reference
-
-```nix
-{pkgs, ...}: {
-  environment.systemPackages = with pkgs; [
-    inputs.m3ta-nixpkgs.packages.${pkgs.system}.notesmd-cli
-  ];
-}
-```
-
-### Run Directly
-
-```bash
-nix run git+https://code.m3ta.dev/m3tam3re/nixpkgs#notesmd-cli
-```
-
-## Usage
-
-### Basic Commands
-
-```bash
-# Show help
-notesmd-cli --help
-
-# Create a new note
-notesmd-cli new "My Note Title"
-
-# Search notes
-notesmd-cli search "search term"
-
-# List notes
-notesmd-cli list
-```
-
-### Working with Vaults
-
-```bash
-# Specify vault path
-notesmd-cli --vault /path/to/vault new "Note Title"
-
-# Open a note in Obsidian
-notesmd-cli open "Note Name"
-```
-
-### Advanced Usage
-
-```bash
-# Search with tags
-notesmd-cli search --tag "project"
-
-# Append to existing note
-notesmd-cli append "Note Name" "Additional content"
-```
-
-## Configuration
-
-### Environment Variables
-
-- `OBSIDIAN_VAULT`: Default vault path
-
-### Command Line Options
-
-Run `notesmd-cli --help` for a complete list of options.
-
-## Build Information
-
-- **Version**: 0.3.0
-- **Language**: Go
-- **License**: MIT
-- **Source**: [GitHub](https://github.com/Yakitrak/notesmd-cli)
-- **Vendor Hash**: null (no external dependencies)
-
-## Platform Support
-
-- Linux
-- macOS (Unix systems)
-
-## Notes
-
-- No vendor dependencies (pure Go stdlib)
-- The binary is named `notesmd-cli` (not `notesmd`)
-- This is the community CLI, not the official Obsidian CLI
-
-## Related
-
-- [Obsidian](https://obsidian.md) - The Obsidian application
-- [Adding Packages](../guides/adding-packages.md) - How to add new packages
-- [Quick Start](../QUICKSTART.md) - Getting started guide

docs/plans/2026-04-15-nixpkgs-cleanup-and-improvements.md

@@ -0,0 +1,637 @@
+# m3ta-nixpkgs: Cleanup & Improvements Plan
+
+> **For Hermes:** Use subagent-driven-development skill to implement this plan task-by-task.
+
+**Goal:** Address 10 issues identified in codebase review — reduce duplication, improve naming consistency, extract inline scripts, add testing, and update documentation.
+
+**Architecture:** Incremental improvements across lib/, modules/, overlays/, docs/, and CI. Each change is self-contained and can be merged independently. No breaking changes to public API (backward-compat aliases preserved where needed).
+
+**Repo:** `gitea@code.m3ta.dev:m3tam3re/nixpkgs.git` (master branch)
+
+---
+
+## Phase 1: Deduplication & Naming (Low Risk)
+
+### Task 1: Remove duplicate opencode-rules.nix file
+
+**Objective:** Eliminate the duplicate file import. The `coding-rules.nix` is the canonical source; `opencode-rules.nix` is an identical copy. Make the alias a one-liner in `lib/default.nix`.
+
+**Files:**
+- Delete: `lib/opencode-rules.nix`
+- Modify: `lib/default.nix`
+
+**Step 1: Update lib/default.nix to alias directly**
+
+```nix
+{lib}: {
+  ports = import ./ports.nix {inherit lib;};
+
+  coding-rules = import ./coding-rules.nix {inherit lib;};
+
+  # Backward-compat alias: opencode-rules → coding-rules
+  opencode-rules = import ./coding-rules.nix {inherit lib;};
+  opencode = import ./coding-rules.nix {inherit lib;};
+}
+```
+
+**Step 2: Delete the duplicate file**
+
+```bash
+git rm lib/opencode-rules.nix
+```
+
+**Step 3: Verify nothing breaks**
+
+```bash
+nix flake check
+```
+
+**Step 4: Commit**
+
+```bash
+git commit -m "refactor: remove duplicate opencode-rules.nix, use alias in default.nix"
+```
+
+---
+
+### Task 2: Tool-agnostic naming in coding-rules.nix internals
+
+**Objective:** Rename internal variables and output artifacts in `coding-rules.nix` from opencode-specific names to generic names, while keeping the backward-compat alias `mkOpencodeRules`.
+
+**Files:**
+- Modify: `lib/coding-rules.nix`
+
+**Step 1: Rename internal symbols**
+
+In `lib/coding-rules.nix`, rename:
+- `rulesDir` stays `.opencode-rules` (this is a filesystem path used by existing projects, changing it would break)
+- `opencodeConfig` → `rulesConfig`
+- `opencode.json` output → `coding-rules.json` (add a comment noting it was renamed)
+- Add `rulesDir` option to function signature with default `.opencode-rules`
+
+Updated function:
+
+```nix
+{lib}: let
+  mkCodingRules = {
+    agents,
+    languages ? [],
+    concerns ? [
+      "coding-style"
+      "naming"
+      "documentation"
+      "testing"
+      "git-workflow"
+      "project-structure"
+    ],
+    frameworks ? [],
+    extraInstructions ? [],
+    rulesDir ? ".opencode-rules",
+  }: let
+    instructions =
+      (map (c: "${rulesDir}/concerns/${c}.md") concerns)
+      ++ (map (l: "${rulesDir}/languages/${l}.md") languages)
+      ++ (map (f: "${rulesDir}/frameworks/${f}.md") frameworks)
+      ++ extraInstructions;
+
+    rulesConfig = {
+      "$schema" = "https://opencode.ai/config.json";
+      inherit instructions;
+    };
+  in {
+    inherit instructions;
+
+    shellHook = ''
+      # Create/update symlink to AGENTS rules directory
+      ln -sfn ${agents}/rules ${rulesDir}
+
+      # Generate coding-rules configuration file
+      cat > coding-rules.json <<'RULES_EOF'
+      ${builtins.toJSON rulesConfig}
+      RULES_EOF
+    '';
+  };
+
+  # Backward-compat alias
+  mkOpencodeRules = mkCodingRules;
+in {
+  inherit mkCodingRules mkOpencodeRules;
+};
+```
+
+**Step 2: Update shellHook comment in AGENTS.md**
+
+In `AGENTS.md`, update the coding-rules section to mention the new `rulesDir` parameter and the `coding-rules.json` output file.
+
+**Step 3: Verify**
+
+```bash
+nix flake check
+```
+
+**Step 4: Commit**
+
+```bash
+git commit -m "refactor: tool-agnostic naming in coding-rules.nix internals"
+```
+
+---
+
+### Task 3: Remove redundant overlays entry in flake.nix
+
+**Objective:** The `default` and `additions` overlays in `flake.nix` produce identical output. Remove `additions` if not referenced elsewhere, or document why both exist.
+
+**Files:**
+- Modify: `flake.nix`
+- Check: all consumer repos for references to `overlays.additions`
+
+**Step 1: Search for consumers of overlays.additions**
+
+```bash
+# Check nixos-config and other repos
+grep -r "overlays.additions" /data/.hermes/repos/nixos-config/
+grep -r "additions" /data/.hermes/repos/nixos-config/ --include="*.nix" | grep overlay
+```
+
+**Step 2: If no consumers found, remove additions**
+
+In `flake.nix`, simplify overlays to:
+
+```nix
+overlays = {
+  default = final: prev:
+    import ./pkgs {
+      pkgs = final;
+      inputs = inputs;
+    };
+
+  modifications = final: prev: import ./overlays/mods {inherit prev;};
+};
+```
+
+**Step 3: Verify**
+
+```bash
+nix flake check
+```
+
+**Step 4: Commit**
+
+```bash
+git commit -m "refactor: remove redundant 'additions' overlay (identical to 'default')"
+```
+
+**Note:** If `additions` IS used elsewhere, add a comment explaining the convention and skip this task.
+
+---
+
+## Phase 2: Extract Inline Scripts (Medium Risk)
+
+### Task 4: Extract pi-agent runner script to standalone file
+
+**Objective:** Move the ~200-line inline bash script in `modules/nixos/pi-agent.nix` (the `runner` variable) to a separate file `modules/nixos/pi-agent-runner.sh` that gets imported via `builtins.readFile` + `pkgs.writeShellApplication`.
+
+**Files:**
+- Create: `modules/nixos/pi-agent-runner.sh`
+- Modify: `modules/nixos/pi-agent.nix`
+
+**Step 1: Create the runner script file**
+
+Extract the body of the `runner` script (everything inside the `pkgs.writeShellScriptBin cfg.wrapper.runnerName '' ... ''`) into `modules/nixos/pi-agent-runner.sh`.
+
+The script uses Nix-style variable interpolation (`${...}`). We need to keep Nix template variables as `${...}` and convert runtime bash variables to use `$` prefix. Since the script already uses Nix `escapeShellArg` and `escapeShellArg` calls, the cleanest approach is:
+
+Create `modules/nixos/pi-agent-runner.sh` as a template that `pkgs.substituteAll` or `builtins.readFile` + string replacement can process. However, given the heavy Nix interpolation, the pragmatic approach is to use `pkgs.writeShellApplication` with the script body inline but extracted to a `let` binding:
+
+```nix
+# In pi-agent.nix, replace the inline runner with:
+let
+  runnerScript = builtins.readFile ./pi-agent-runner.sh;
+  # ... or keep as let binding but move the body to a separate derivation
+```
+
+**Important caveat:** The script has ~30 Nix variable interpolations (`${cfg.user}`, `${escapeShellArg ...}`, etc.). Full extraction to a .sh file would require either:
+- (a) `substituteAll` with `--replace` for each variable — unwieldy at 30+ substitutions
+- (b) Converting to env vars passed at runtime — cleaner but changes security posture
+- (c) Keeping the Nix interpolation but extracting to a `let` block in a separate `.nix` file
+
+**Recommended approach: Option (c)** — Create `modules/nixos/pi-agent-runner.nix` as a function that takes `cfg` and returns the script:
+
+```nix
+# modules/nixos/pi-agent-runner.nix
+{cfg, pkgs, lib, ...}:
+with lib; let
+  # ... all the helper variables from pi-agent.nix ...
+in
+  pkgs.writeShellScriptBin cfg.wrapper.runnerName ''
+    # ... the script body ...
+  '';
+```
+
+Then in `pi-agent.nix`:
+```nix
+runner = import ./pi-agent-runner.nix {inherit cfg pkgs lib;};
+```
+
+**Step 2: Similarly extract the wrapper script**
+
+Create `modules/nixos/pi-agent-wrapper.nix` for the `wrapper` variable.
+
+**Step 3: Verify**
+
+```bash
+nix flake check
+# Also test in a nixos-rebuild if possible
+```
+
+**Step 4: Commit**
+
+```bash
+git add modules/nixos/pi-agent-runner.nix modules/nixos/pi-agent-wrapper.nix
+git commit -m "refactor: extract pi-agent runner and wrapper to separate files"
+```
+
+---
+
+## Phase 3: Testing (Higher Value)
+
+### Task 5: Add basic lib function tests
+
+**Objective:** Add `nix eval`-based tests for `lib/agents.nix` parseRule logic and `lib/coding-rules.nix` instruction generation.
+
+**Files:**
+- Create: `tests/lib/agents-test.nix`
+- Create: `tests/lib/coding-rules-test.nix`
+- Modify: `flake.nix` (add checks)
+
+**Step 1: Create test infrastructure**
+
+```nix
+# tests/lib/default.nix
+{
+  agents = import ./agents-test.nix;
+  coding-rules = import ./coding-rules-test.nix;
+}
+```
+
+**Step 2: Write agents.nix parseRule test**
+
+```nix
+# tests/lib/agents-test.nix
+let
+  lib = import <nixpkgs/lib>;
+  agentsLib = (import ../../lib {inherit lib;}).agents;
+
+  # Test parseRule helper
+  test1 = let
+    result = builtins.tryEval (
+      let
+        # We can't directly test parseRule since it's internal.
+        # Instead, test the renderer with minimal input.
+        canonical = {
+          test-agent = {
+            description = "Test agent";
+            mode = "primary";
+            systemPrompt = "You are a test.";
+            permissions = {
+              bash = { intent = "allow"; };
+              edit = { intent = "ask"; rules = ["rm -rf *:deny"]; };
+            };
+          };
+        };
+        pkgs = import <nixpkgs> { system = "x86_64-linux"; };
+        rendered = agentsLib.renderForOpencode {
+          inherit pkgs canonical;
+        };
+      in
+        # Verify the derivation builds
+        builtins.pathExists "${rendered}/test-agent.md"
+    );
+  in assert result.value == true; true;
+
+in {
+  parseRule-basic = test1;
+}
+```
+
+**Step 3: Write coding-rules test**
+
+```nix
+# tests/lib/coding-rules-test.nix
+let
+  lib = import <nixpkgs/lib>;
+  codingRulesLib = (import ../../lib {inherit lib;}).coding-rules;
+
+  rules = codingRulesLib.mkCodingRules {
+    agents = "/tmp/fake-agents";
+    languages = ["python"];
+    concerns = ["naming"];
+    rulesDir = ".coding-rules";
+  };
+
+  # Verify instructions are generated correctly
+  test1 = assert rules.instructions == [
+    ".coding-rules/concerns/naming.md"
+    ".coding-rules/languages/python.md"
+  ]; true;
+
+  # Verify backward-compat alias exists
+  test2 = assert codingRulesLib.mkOpencodeRules == codingRulesLib.mkCodingRules; true;
+
+in {
+  instructions-correct = test1;
+  backward-compat = test2;
+}
+```
+
+**Step 4: Add to flake.nix checks**
+
+In `flake.nix`, extend the `checks` attribute:
+
+```nix
+checks = forAllSystems (system: let
+  pkgs = pkgsFor system;
+  packages = import ./pkgs {inherit pkgs inputs;};
+in
+  builtins.mapAttrs (name: pkg: pkgs.lib.hydraJob pkg) packages
+  // {
+    formatting = pkgs.runCommand "check-formatting" {} ''
+      ${pkgs.alejandra}/bin/alejandra --check ${./.}
+      touch $out
+    '';
+    lib-tests = pkgs.runCommand "lib-tests" {} ''
+      ${pkgs.nix}/bin/nix-instantiate --eval ${./tests/lib/default.nix}
+      touch $out
+    '';
+  });
+```
+
+**Step 5: Verify**
+
+```bash
+nix flake check
+```
+
+**Step 6: Commit**
+
+```bash
+git add tests/
+git commit -m "test: add basic lib function tests for agents and coding-rules"
+```
+
+---
+
+### Task 6: Add NixOS VM test for pi-agent module
+
+**Objective:** Add a basic NixOS VM test that verifies the pi-agent module can be evaluated and the wrapper/runner scripts exist.
+
+**Files:**
+- Create: `tests/nixos/pi-agent-test.nix`
+- Modify: `flake.nix` (add to checks)
+
+**Step 1: Write the VM test**
+
+```nix
+# tests/nixos/pi-agent-test.nix
+{pkgs, ...}: {
+  name = "pi-agent";
+
+  nodes.machine = {config, ...}: {
+    imports = [
+      ${(pkgs.path + "/nixos/modules/module-list.nix")}
+    ];
+
+    # Minimal pi-agent config
+    m3ta.pi-agent = {
+      enable = true;
+      package = pkgs.writeScriptBin "pi-agent" ''
+        #!/bin/sh
+        echo "pi-agent mock"
+      '';
+      createUser = true;
+      hostUsers = {
+        testuser = {
+          projectRoots = ["/tmp/test-project"];
+        };
+      };
+    };
+
+    users.users.testuser = {
+      isNormalUser = true;
+    };
+  };
+
+  testScript = ''
+    machine.start()
+    machine.wait_for_unit("multi-user.target")
+
+    # Verify user was created
+    machine.succeed("id pi-agent")
+
+    # Verify wrapper exists
+    machine.succeed("which pi")
+
+    # Verify state directory
+    machine.succeed("test -d /var/lib/pi-agent")
+    machine.succeed("test -d /var/lib/pi-agent/.pi")
+  '';
+}
+```
+
+**Step 2: Add to flake.nix checks**
+
+```nix
+# In the checks attrset:
+pi-agent-vm-test = pkgs.nixosTest (import ./tests/nixos/pi-agent-test.nix {inherit pkgs;});
+```
+
+**Step 3: Verify**
+
+```bash
+nix build .#checks.x86_64-linux.pi-agent-vm-test
+```
+
+**Step 4: Commit**
+
+```bash
+git add tests/nixos/
+git commit -m "test: add NixOS VM test for pi-agent module"
+```
+
+---
+
+## Phase 4: Documentation (Low Risk, High Value)
+
+### Task 7: Update AGENTS.md to reflect current state
+
+**Objective:** Remove outdated migration sections, update function signatures, and align with current code.
+
+**Files:**
+- Modify: `AGENTS.md`
+
+**Step 1: Update the AGENTS REWORK migration section**
+
+The section starting with `## MIGRATION: Agent System (OpenCode → Canonical TOML)` describes a completed migration. Convert it to a brief "Architecture" section that describes the current state, not the migration path.
+
+**Step 2: Update lib.agents function table**
+
+Verify that the function signatures and descriptions in the AGENTS.md table match the actual functions in `lib/agents.nix`. Specifically:
+- `loadCanonical` takes `{agentsInput}` — confirm docs match
+- `renderForPi` now has `primaryAgent` parameter — confirm documented
+- `shellHookForTool` exists — confirm documented
+
+**Step 3: Update coding-rules documentation**
+
+Replace references to `mkOpencodeRules` with `mkCodingRules` as primary, `mkOpencodeRules` as backward-compat alias. Document the new `rulesDir` parameter.
+
+**Step 4: Update overlay documentation**
+
+Remove or annotate the `additions` overlay depending on Task 3 outcome.
+
+**Step 5: Commit**
+
+```bash
+git commit -m "docs: update AGENTS.md to reflect current codebase state"
+```
+
+---
+
+### Task 8: Add CHANGELOG.md
+
+**Objective:** Create a changelog that captures recent work (from git log) so consumers can track changes.
+
+**Files:**
+- Create: `CHANGELOG.md`
+
+**Step 1: Generate changelog from git history**
+
+```bash
+cd /data/.hermes/repos/nixpkgs-review
+git log --oneline --no-merges master | head -30
+```
+
+**Step 2: Write CHANGELOG.md**
+
+Structure as Keep a Changelog format:
+
+```markdown
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/).
+
+## [Unreleased]
+
+## [0.4.0] - 2026-04-15
+
+### Added
+- Pi agent wrapper with per-host-user policy enforcement (`m3ta.pi-agent` NixOS module)
+- `coding.agents.pi` Home Manager module with settings, MCP, and skills support
+- `coding.agents.claude-code` Home Manager module with MCP integration
+- Automated package updates via Gitea Actions (`nix-update` workflow)
+- `lib.agents.renderForPi` with primaryAgent selection and pi-subagents format
+- `pkgs/td` - Task management CLI for AI coding sessions
+
+### Changed
+- Renamed `lib.opencode-rules` → `lib.coding-rules` (backward-compat alias preserved)
+- Agent system migrated to harness-agnostic canonical format
+- Pi settings sync now merges host and Nix-managed values via deep_merge
+
+### Fixed
+- Pi settings sync race condition on first run
+```
+
+**Step 3: Commit**
+
+```bash
+git commit -m "docs: add CHANGELOG.md"
+```
+
+---
+
+## Phase 5: Minor Cleanups (Low Risk)
+
+### Task 9: Clean up pkgs/default.nix unused `system` binding
+
+**Objective:** The `system = pkgs.stdenv.hostPlatform.system;` binding in `pkgs/default.nix` is only used for the two input-pass-throughs. If those are the only consumers, it's fine, but add a clarifying comment.
+
+**Files:**
+- Modify: `pkgs/default.nix`
+
+**Step 1: Add clarifying comment**
+
+```nix
+{
+  pkgs,
+  inputs,
+  ...
+}: let
+  # Only used for flake input pass-throughs below
+  system = pkgs.stdenv.hostPlatform.system;
+in {
+  ...
+```
+
+**Step 2: Commit**
+
+```bash
+git commit -m "docs: clarify system binding in pkgs/default.nix"
+```
+
+---
+
+### Task 10: Remove commented-out overlay entries in overlays/default.nix
+
+**Objective:** Clean up the large block of commented-out code in `overlays/default.nix` (nodejs_24, paperless-ngx, anytype-heart, hyprpanel, etc.). These belong in git history, not in active code.
+
+**Files:**
+- Modify: `overlays/default.nix`
+
+**Step 1: Remove commented-out blocks**
+
+Remove:
+- The `rose-pine-hyprcursor` addition from `additions` (if it's unused — check with grep)
+- The commented-out `nodejs_24`, `paperless-ngx`, `anytype-heart`, `trezord`, `mesa`, `hyprpanel` blocks from `modifications`
+- The commented-out overlay inputs (`temp-packages`, `stable-packages`, `pinned-packages`, `locked-packages`, `master-packages`) if they reference inputs not in `flake.nix`
+
+Actually, `nixpkgs-stable`, `nixpkgs-9e9486b`, `nixpkgs-9472de4`, `nixpkgs-locked`, `nixpkgs-master` are NOT in the current `flake.nix` inputs. These overlays will fail if referenced. They should either be removed or the inputs should be added.
+
+**Action:**
+- Keep `master-packages` IF `nixpkgs-master` is in flake.nix inputs (it IS — good)
+- Remove `temp-packages`, `pinned-packages`, `locked-packages` (inputs don't exist)
+- Keep `stable-packages` IF `nixpkgs-stable` exists in inputs (check — it does NOT currently exist)
+- Keep `additions` with `rose-pine-hyprcursor` IF `rose-pine-hyprcursor` input exists (check)
+
+**Step 2: Verify**
+
+```bash
+nix flake check
+```
+
+**Step 3: Commit**
+
+```bash
+git commit -m "chore: remove dead overlay entries for non-existent flake inputs"
+```
+
+---
+
+## Execution Order & Priority
+
+| Task | Risk | Effort | Impact | Dependencies |
+|------|------|--------|--------|-------------|
+| T1: Remove opencode-rules.nix | Low | 5min | Clean | None |
+| T2: Tool-agnostic naming | Low | 15min | Consistency | None |
+| T3: Remove redundant overlay | Low | 10min | Clean | Check consumers |
+| T9: Clarify system binding | Low | 2min | Docs | None |
+| T10: Remove dead overlays | Low | 10min | Clean | None |
+| T7: Update AGENTS.md | Low | 20min | Docs | After T1, T2 |
+| T8: Add CHANGELOG.md | Low | 15min | Docs | None |
+| T4: Extract pi-agent scripts | Medium | 45min | Maintainability | None |
+| T5: Lib function tests | Medium | 30min | Quality | None |
+| T6: NixOS VM test | Medium | 45min | Quality | None |
+
+**Recommended order:** T1 → T9 → T10 → T3 → T2 → T7 → T8 → T5 → T4 → T6
+
+**Branching strategy:** Create a feature branch `chore/cleanup-review` from master, implement all tasks, open PR for review before merging.

docs/reference/functions.md

@@ -153,33 +153,6 @@ allServices = portHelpers.listServices;
 # Returns: ["nginx" "grafana" "prometheus" "homepage"]
 ```
 
-### `getDefaultPort`
-
-Simple helper to get a port without host override.
-
-#### Signature
-
-```nix
-getDefaultPort :: portsConfig -> string -> int-or-null
-```
-
-#### Arguments
-
-1. `portsConfig` - Same structure as `mkPortHelpers`
-2. `service` - The service name (string)
-
-#### Returns
-
-Port number (int) or `null` if service not found.
-
-#### Usage
-
-```nix
-services.my-service = {
-  port = m3taLib.ports.getDefaultPort myPorts "my-service";
-};
-```
-
 ## Using Library Functions
 
 ### Importing
@@ -262,7 +235,7 @@ in {
 | `getPort` | Get port with optional host override | `int or null` |
 | `getHostPorts` | Get all ports for host | `attrs` |
 | `listServices` | List all service names | `[string]` |
-| `getDefaultPort` | Get default port only | `int or null` |
+
 
 ## Related
 

docs/templates.md

@@ -0,0 +1,162 @@
+# Templates
+
+Boilerplate templates for quickly adding new packages or modules to m3ta-nixpkgs.
+
+## Available Templates
+
+| Template | Command | Creates |
+|---------|---------|---------|
+| Package | `nix flake init -t .#package` | `templates/package/` |
+| NixOS Module | `nix flake init -t .#nixos-module` | `templates/nixos-module/` |
+| Home Manager Module | `nix flake init -t .#home-manager-module` | `templates/home-manager-module/` |
+
+## Using Templates
+
+### 1. List Available Templates
+
+```bash
+nix flake show --templates .
+```
+
+### 2. Initialize from a Template
+
+```bash
+# Package
+nix flake init -t .#package
+
+# NixOS Module
+nix flake init -t .#nixos-module
+
+# Home Manager Module
+nix flake init -t .#home-manager-module
+```
+
+Note: `nix flake init` copies the template contents into the current directory. Use a subdirectory name:
+
+```bash
+mkdir new-package && cd new-package
+nix flake init -t ..#package
+```
+
+## Package Template
+
+Creates a complete package structure:
+
+```
+templates/package/
+├── default.nix    # Package definition with comments
+```
+
+### Fields to Fill In
+
+| Field | Location | Notes |
+|-------|----------|-------|
+| `pname` | `default.nix` | Package name (kebab-case) |
+| `version` | `default.nix` | Semantic version |
+| `src` | `default.nix` | Fetcher (GitHub, URL, Git, etc.) |
+| `hash` | `default.nix` | Use `lib.fakeHash`, build to get real hash |
+| `meta.description` | `default.nix` | Short one-line description |
+| `meta.homepage` | `default.nix` | Project URL |
+| `meta.license` | `default.nix` | Use `lib.licenses.*` |
+| `meta.platforms` | `default.nix` | Usually `platforms.linux` |
+| `meta.mainProgram` | `default.nix` | Main binary name |
+
+### Common Build Systems
+
+```nix
+# Rust (recommended)
+rustPlatform.buildRustPackage rec { ... }
+
+# Python
+python3.pkgs.buildPythonPackage rec { ... }
+
+# Node.js
+pkg-config, nodejs, npm2nix, or pnpm + prisma
+
+# Shell script
+writeShellScriptBin "name" ''echo hello''
+
+# Go
+go mdbook build
+
+# Generic C/Make
+stdenv.mkDerivation { ... }
+```
+
+See [Adding Packages](./guides/adding-packages.md) for detailed instructions.
+
+## NixOS Module Template
+
+Creates a complete NixOS module:
+
+```
+templates/nixos-module/
+├── default.nix    # Module with options
+└── README.md       # Module documentation
+```
+
+### Fields to Fill In
+
+| Field | Location | Notes |
+|-------|----------|-------|
+| Module name | `default.nix` | File name matches `m3ta.<name>` |
+| Options | `default.nix` | Add under `options.m3ta.<name>` |
+| Config | `default.nix` | Add under `config.m3ta.<name>` |
+| Description | `README.md` | What the module does |
+
+### After Creating
+
+1. Add to `modules/nixos/default.nix` imports
+2. Optionally export from `flake.nix` `nixosModules`
+3. Add documentation to `docs/modules/nixos/`
+4. Run `nix flake check`
+
+## Home Manager Module Template
+
+Creates a complete Home Manager module:
+
+```
+templates/home-manager-module/
+├── default.nix    # Module with options
+└── README.md       # Module documentation
+```
+
+### Fields to Fill In
+
+| Field | Location | Notes |
+|-------|----------|-------|
+| Category | Directory | Choose `cli/` or `coding/` |
+| Options | `default.nix` | Add under `options.m3ta.<name>` |
+| Config | `default.nix` | Add under `config.m3ta.<name>` |
+| Description | `README.md` | What the module does |
+
+### After Creating
+
+1. Add to the appropriate category aggregator (`cli/default.nix` or `coding/default.nix`)
+2. Optionally export from `flake.nix` `homeManagerModules`
+3. Add documentation to `docs/modules/home-manager/`
+4. Run `nix flake check`
+
+## Template Variables
+
+Templates use Nix attribute references. After copying, search for these placeholders:
+
+| Placeholder | Replace With |
+|-------------|--------------|
+| `package-name` | Your package name (kebab-case) |
+| `owner-name` / `repo-name` | GitHub owner and repo |
+| `0.1.0` | Initial version |
+| `lib.fakeHash` | Real hash after first build |
+| `lib.licenses.mit` | Appropriate license |
+| `A short description` | One-line description |
+
+## Automated Updates
+
+Packages created from templates are automatically updated weekly by the Gitea Actions workflow. See the main README for details on the `nix-update` automation.
+
+## Related
+
+- [Adding Packages](./guides/adding-packages.md) - Detailed package guide
+- [Adding Modules](./guides/adding-modules.md) - Detailed module guide
+- [Development Workflow](./guides/development-workflow.md) - Local development
+- [Architecture](./ARCHITECTURE.md) - Repository structure

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "agents": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1777399938,
+        "narHash": "sha256-xXPqUQezDdDtF8MbpZnwD1HkybOYwF92evx8rJ6OXCU=",
+        "ref": "refs/heads/master",
+        "rev": "9a91f1ee0cf011a7eaf1f16a9e17610b0457e055",
+        "revCount": 85,
+        "type": "git",
+        "url": "https://code.m3ta.dev/m3tam3re/AGENTS"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://code.m3ta.dev/m3tam3re/AGENTS"
+      }
+    },
     "basecamp": {
       "inputs": {
         "nixpkgs": [
@@ -23,11 +39,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1775423009,
-        "narHash": "sha256-vPKLpjhIVWdDrfiUM8atW6YkIggCEKdSAlJPzzhkQlw=",
+        "lastModified": 1777268161,
+        "narHash": "sha256-bxrdOn8SCOv8tN4JbTF/TXq7kjo9ag4M+C8yzzIRYbE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "68d8aa3d661f0e6bd5862291b5bb263b2a6595c9",
+        "rev": "1c3fe55ad329cbcb28471bb30f05c9827f724c76",
         "type": "github"
       },
       "original": {
@@ -39,11 +55,11 @@
     },
     "nixpkgs-master": {
       "locked": {
-        "lastModified": 1775657231,
-        "narHash": "sha256-DP8FfybiZPp5WLB9eIk0TC2mdvuYzxLGgrBODDrwPEI=",
+        "lastModified": 1777643636,
+        "narHash": "sha256-7vvm5Ia8o3g7YNErFcDsbCx+Pk8HbnA+ZYuA5Zga7hY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4e03baaa39b7746eac5704d623461422131cd03d",
+        "rev": "da2366fac507ce7bd31852e7351e55b951656999",
         "type": "github"
       },
       "original": {
@@ -53,27 +69,6 @@
         "type": "github"
       }
     },
-    "opencode": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs-master"
-        ]
-      },
-      "locked": {
-        "lastModified": 1775782812,
-        "narHash": "sha256-m+Ue7FWiTjKMAn1QefAwOMfOb2Vybk0mJPV9zcbkOmE=",
-        "owner": "anomalyco",
-        "repo": "opencode",
-        "rev": "877be7e8e04142cd8fbebcb5e6c4b9617bf28cce",
-        "type": "github"
-      },
-      "original": {
-        "owner": "anomalyco",
-        "ref": "v1.4.3",
-        "repo": "opencode",
-        "type": "github"
-      }
-    },
     "openspec": {
       "inputs": {
         "nixpkgs": [
@@ -81,11 +76,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1775372219,
-        "narHash": "sha256-MJakKC026Sarz7nMmiFrfONWc4xgaw8ApV0Hhp4ebhM=",
+        "lastModified": 1777556999,
+        "narHash": "sha256-HfFlRwR8IMjudRttN4T8L3DJKnNlpWfeNzQPly/HaRY=",
         "owner": "Fission-AI",
         "repo": "OpenSpec",
-        "rev": "64d476f8b924bb9b74b896ea0aa784970e37da69",
+        "rev": "347f0277e3be3549cd85cdea364fbd7710f1922b",
         "type": "github"
       },
       "original": {
@@ -96,10 +91,10 @@
     },
     "root": {
       "inputs": {
+        "agents": "agents",
         "basecamp": "basecamp",
         "nixpkgs": "nixpkgs",
         "nixpkgs-master": "nixpkgs-master",
-        "opencode": "opencode",
         "openspec": "openspec"
       }
     }

flake.nix

@@ -10,17 +10,17 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    # opencode needs newer bun from master
-    opencode = {
-      url = "github:anomalyco/opencode/v1.4.3";
-      inputs.nixpkgs.follows = "nixpkgs-master";
-    };
-
     # openspec - spec-driven development for AI coding assistants
     openspec = {
       url = "github:Fission-AI/OpenSpec";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    # Agent definitions and coding rules
+    agents = {
+      url = "git+https://code.m3ta.dev/m3tam3re/AGENTS";
+      flake = false;
+    };
   };
 
   outputs = {
@@ -56,13 +56,6 @@
           inputs = inputs;
         };
 
-      # Individual overlays for more granular control
-      additions = final: prev:
-        import ./pkgs {
-          pkgs = final;
-          inputs = inputs;
-        };
-
       modifications = final: prev: import ./overlays/mods {inherit prev;};
     };
 
@@ -84,18 +77,18 @@
     };
 
     # Library functions - helper utilities for your configuration
-    lib = forAllSystems (system: let
-      pkgs = pkgsFor system;
-    in
-      import ./lib {lib = pkgs.lib;});
+    lib = forAllSystems (system: import ./lib {lib = nixpkgs.lib;});
 
     # Development shells for various programming environments
     # Usage: nix develop .#<shell-name>
-    # Available shells: default, python, devops, opencode
+    # Available shells: default, python, devops, coding
     devShells = forAllSystems (system: let
       pkgs = pkgsFor system;
     in
-      import ./shells {inherit pkgs inputs;});
+      import ./shells {
+        inherit pkgs inputs;
+        agents = inputs.agents;
+      });
 
     # Formatter for 'nix fmt'
     formatter = forAllSystems (system: (pkgsFor system).alejandra);
@@ -111,6 +104,15 @@
           ${pkgs.alejandra}/bin/alejandra --check ${./.}
           touch $out
         '';
+        # Lib unit tests
+        lib-agents = import ./tests/lib/agents-test.nix {
+          inherit pkgs;
+          lib = pkgs.lib;
+        };
+        lib-coding-rules = import ./tests/lib/coding-rules-test.nix {
+          inherit pkgs;
+          lib = pkgs.lib;
+        };
       });
 
     # Templates for creating new packages/modules

lib/agents.nix

@@ -26,6 +26,27 @@
     pattern = lib.concatStringsSep ":" (lib.init parts);
   in {inherit pattern action;};
 
+  # ── Shared renderer primitives ──────────────────────────────────
+  # Render agent files from canonical definitions into a directory.
+  # Each agent gets a "<name>.md" file containing mkContent name agent.
+  #
+  # Args:
+  #   pkgs       — Nixpkgs package set with linkFarm
+  #   canonical  — Attribute set of agent definitions (keyed by slug)
+  #   mkContent  — Function: name: agent → string (file content)
+  #   name       — Derivation name (e.g. "opencode-agents")
+  #
+  # Returns:
+  #   A store path containing all agent *.md files.
+  renderAgentFiles = pkgs: canonical: mkContent: name:
+    pkgs.linkFarm name (
+      lib.mapAttrsToList (n: a: {
+        name = "${n}.md";
+        path = pkgs.writeText "${n}.md" (mkContent n a);
+      })
+      canonical
+    );
+
   agentsLib = {
     # ── loadCanonical ─────────────────────────────────────────────
     #
@@ -87,20 +108,8 @@
 
       mkAgentContent = name: agent:
         (mkFrontmatter name agent) + agent.systemPrompt;
-
-      mkAgentFile = name: agent:
-        pkgs.writeText "${name}.md" (mkAgentContent name agent);
-
-      agentFiles = lib.mapAttrs mkAgentFile canonical;
-
-      copyCommands = lib.concatStringsSep "\n" (
-        lib.mapAttrsToList (name: file: "cp ${file} $out/${name}.md") agentFiles
-      );
     in
-      pkgs.runCommand "opencode-agents" {} ''
-        mkdir -p $out
-        ${copyCommands}
-      '';
+      renderAgentFiles pkgs canonical mkAgentContent "opencode-agents";
 
     # ── Claude Code renderer ──────────────────────────────────────
     #
@@ -179,10 +188,7 @@
       mkClaudeAgentContent = name: agent:
         (mkClaudeFrontmatter name agent) + agent.systemPrompt;
 
-      mkClaudeAgentFile = name: agent:
-        pkgs.writeText "${name}.md" (mkClaudeAgentContent name agent);
-
-      agentFiles = lib.mapAttrs mkClaudeAgentFile canonical;
+      agentFiles = renderAgentFiles pkgs canonical mkClaudeAgentContent "claude-code-agent-files";
 
       # Build settings.json with permission rules aggregated from all agents.
       allAllows = lib.flatten (lib.mapAttrsToList (_: agent: renderPermAllow (agent.permissions or {})) canonical);
@@ -196,14 +202,10 @@
       };
 
       settingsFile = pkgs.writeText "claude-settings.json" settingsJson;
-
-      copyAgentCommands = lib.concatStringsSep "\n" (
-        lib.mapAttrsToList (name: file: "cp ${file} $out/.claude/agents/${name}.md") agentFiles
-      );
     in
       pkgs.runCommand "claude-code-agents" {} ''
         mkdir -p $out/.claude/agents
-        ${copyAgentCommands}
+        cp -r ${agentFiles}/* $out/.claude/agents/
         cp ${settingsFile} $out/.claude/settings.json
       '';
 
@@ -223,7 +225,10 @@
       canonical,
       modelOverrides ? {},
       primaryAgent ? null,
+      codingRules ? null,
     }: let
+      # Import coding-rules lib for concatRulesMd when codingRules is provided
+      codingRulesLib = import ./coding-rules.nix {inherit lib;};
       # Find the primary agent (there should be exactly one).
       primaryAgents = lib.filterAttrs (_: a: a.mode == "primary") canonical;
       primaryNames = lib.attrNames primaryAgents;
@@ -292,10 +297,7 @@
       mkPiAgentContent = name: agent:
         (mkPiFrontmatter name agent) + agent.systemPrompt;
 
-      mkPiAgentFile = name: agent:
-        pkgs.writeText "${name}.md" (mkPiAgentContent name agent);
-
-      piAgentFiles = lib.mapAttrs mkPiAgentFile canonical;
+      piAgentFiles = renderAgentFiles pkgs canonical mkPiAgentContent "pi-agent-files";
 
       # ── Build AGENTS.md content ───────────────────────────────────
       primaryDn = primary.display_name or primaryName;
@@ -306,6 +308,19 @@
           "- **" + dn + "**: " + agent.description;
       in
         lib.mapAttrsToList mkEntry subagents;
+      # ── Coding rules section (optional) ────────────────────────
+      # When codingRules is provided, append selected rules to AGENTS.md.
+      # codingRules attrset: { agents, languages, concerns, frameworks }
+      codingRulesSection =
+        if codingRules != null
+        then let
+          section = codingRulesLib.mkRulesMdSection codingRules;
+        in
+          if section != ""
+          then "\n" + section
+          else ""
+        else "";
+
       agentsMd =
         "# Agent Instructions\n"
         + "\n"
@@ -320,20 +335,17 @@
           if subagents == {}
           then ""
           else "## Available Specialists\n\n" + lib.concatStringsSep "\n" specialistEntries + "\n"
-        );
+        )
+        + codingRulesSection;
 
       agentsMdFile = pkgs.writeText "AGENTS.md" agentsMd;
       systemMdFile = pkgs.writeText "SYSTEM.md" primary.systemPrompt;
-
-      copyAgentCommands = lib.concatStringsSep "\n" (
-        lib.mapAttrsToList (name: file: "cp ${file} $out/agents/${name}.md") piAgentFiles
-      );
     in
       pkgs.runCommand "pi-agents" {} ''
         mkdir -p $out/agents
         cp ${agentsMdFile} $out/AGENTS.md
         cp ${systemMdFile} $out/SYSTEM.md
-        ${copyAgentCommands}
+        cp -r ${piAgentFiles}/* $out/agents/
       '';
 
     # ── renderForTool dispatcher ──────────────────────────────────
@@ -346,6 +358,7 @@
       agentsInput,
       tool,
       modelOverrides ? {},
+      codingRules ? null,
     }: let
       canonical = agentsInput.lib.loadAgents;
     in
@@ -362,7 +375,7 @@
       else if tool == "pi"
       then
         agentsLib.renderForPi {
-          inherit pkgs canonical modelOverrides;
+          inherit pkgs canonical modelOverrides codingRules;
         }
       else throw "lib.agents.renderForTool: unknown tool '${tool}'. Must be opencode, claude-code, or pi.";
 
@@ -386,9 +399,10 @@
       agentsInput,
       tool,
       modelOverrides ? {},
+      codingRules ? null,
     }: let
       rendered = agentsLib.renderForTool {
-        inherit pkgs agentsInput tool modelOverrides;
+        inherit pkgs agentsInput tool modelOverrides codingRules;
       };
     in
       if tool == "opencode"

lib/coding-rules.nix

@@ -1,4 +1,4 @@
-# Opencode rules management utilities
+# Coding rules management utilities
 #
 # This module provides functions to configure Opencode agent rules across
 # multiple projects. Rules are defined in the AGENTS repository and can be
@@ -26,7 +26,8 @@
 #
 # The shellHook creates:
 #   - A `.opencode-rules/` symlink pointing to the AGENTS repository rules directory
-#   - An `opencode.json` file with a $schema reference and instructions list
+#   - A `coding-rules.json` file with a $schema reference and instructions list
+#   - (Optional) Appends coding rules to `AGENTS.md` for Pi agent discovery
 #
 # The instructions list contains paths relative to the project root, all prefixed
 # with `.opencode-rules/`, making them portable across different project locations.
@@ -43,10 +44,13 @@
   #               (e.g., [ "react" "fastapi" "django" ])
   #   extraInstructions: Optional list of additional instruction paths
   #                      (for custom rules outside standard locations)
+  #   forPi: Whether to also append rules to AGENTS.md for Pi agent (default: true)
+  #          Pi discovers AGENTS.md files by walking parent dirs + cwd and concatenates them.
+  #          When enabled, a delimited block is appended to (or created in) AGENTS.md.
   #
   # Returns:
   #   An attribute set containing:
-  #     - shellHook: Bash code to create symlink and opencode.json
+  #     - shellHook: Bash code to create symlink and coding-rules.json
   #     - instructions: List of rule file paths (relative to project root)
   #
   # Example:
@@ -82,9 +86,9 @@
     ],
     frameworks ? [],
     extraInstructions ? [],
+    rulesDir ? ".opencode-rules",
+    forPi ? false,
   }: let
-    rulesDir = ".opencode-rules";
-
     # Build instructions list by mapping concerns, languages, frameworks to their file paths
     # All paths are relative to project root via the rulesDir symlink
     instructions =
@@ -93,29 +97,137 @@
       ++ (map (f: "${rulesDir}/frameworks/${f}.md") frameworks)
       ++ extraInstructions;
 
-    # Generate JSON configuration for Opencode
-    opencodeConfig = {
+    # Generate JSON configuration for coding rules
+    rulesConfig = {
       "$schema" = "https://opencode.ai/config.json";
       inherit instructions;
     };
+
+    # Pi rules content (concatenated markdown) — only computed when forPi is true
+    piRulesSection =
+      if forPi
+      then mkRulesMdSection {inherit agents languages concerns frameworks;}
+      else "";
+
+    # Bash snippet to append rules to AGENTS.md for Pi discovery.
+    # Uses HTML comment markers for idempotent updates:
+    #   - Removes any existing CODING-RULES block
+    #   - Appends the new block
+    #   - Creates AGENTS.md if it doesn't exist
+    # Note: Uses plain if-then-else instead of lib.optionalString to avoid
+    # forcing the `lib` argument (which may come from import <nixpkgs/lib>)
+    # when forPi is false.
+    piShellHook =
+      if forPi && piRulesSection != ""
+      then ''
+        # Pi agent: append coding rules to AGENTS.md
+        if [ -f AGENTS.md ]; then
+          # Remove existing coding-rules block (if any)
+          sed -i '/<!-- CODING-RULES:START -->/,/<!-- CODING-RULES:END -->/d' AGENTS.md
+          # Append new coding-rules block
+          cat >> AGENTS.md <<'PIRULES_EOF'
+        ${piRulesSection}
+        PIRULES_EOF
+        else
+          # Create AGENTS.md with just the coding rules
+          cat > AGENTS.md <<'PIRULES_EOF'
+        ${piRulesSection}
+        PIRULES_EOF
+        fi
+      ''
+      else "";
   in {
     inherit instructions;
 
     # Shell hook to set up rules in the project
-    # Creates a symlink to the AGENTS rules directory and generates opencode.json
+    # Creates a symlink to the AGENTS rules directory and generates coding-rules.json
+    # Optionally appends rules to AGENTS.md for Pi agent discovery
     shellHook = ''
       # Create/update symlink to AGENTS rules directory
       ln -sfn ${agents}/rules ${rulesDir}
 
-      # Generate opencode.json configuration file
-      cat > opencode.json <<'OPENCODE_EOF'
-      ${builtins.toJSON opencodeConfig}
-      OPENCODE_EOF
+      # Generate coding-rules.json configuration file
+      cat > coding-rules.json <<'RULES_EOF'
+      ${builtins.toJSON rulesConfig}
+      RULES_EOF
+
+      ${piShellHook}
     '';
   };
+  # Concatenate selected rule files from the AGENTS repository into a single
+  # markdown string. Used by Pi (append to AGENTS.md) and could be used by
+  # other tools that don't support an instructions list.
+  #
+  # Args:
+  #   agents: Path to the AGENTS repository (non-flake input)
+  #   languages: Optional list of language-specific rules to include
+  #   concerns: Optional list of concern rules to include
+  #             Default: [ "coding-style" "naming" "documentation" "testing" "git-workflow" "project-structure" ]
+  #   frameworks: Optional list of framework-specific rules to include
+  #
+  # Returns: A single concatenated markdown string with all selected rules.
+  #
+  # Example:
+  #   concatRulesMd {
+  #     agents = inputs.agents;
+  #     languages = [ "python" ];
+  #     concerns = [ "coding-style" ];
+  #   }
+  #   # Returns: "\n# Coding Style\n\n...python rules...\n"
+  concatRulesMd = {
+    agents,
+    languages ? [],
+    concerns ? [
+      "coding-style"
+      "naming"
+      "documentation"
+      "testing"
+      "git-workflow"
+      "project-structure"
+    ],
+    frameworks ? [],
+  }: let
+    rulePaths =
+      (map (c: {
+          kind = "concerns";
+          name = c;
+        })
+        concerns)
+      ++ (map (l: {
+          kind = "languages";
+          name = l;
+        })
+        languages)
+      ++ (map (f: {
+          kind = "frameworks";
+          name = f;
+        })
+        frameworks);
 
-  # Backward-compat alias
-  mkOpencodeRules = mkCodingRules;
+    readRule = rule: builtins.readFile "${agents}/rules/${rule.kind}/${rule.name}.md";
+    ruleContents = map readRule rulePaths;
+  in
+    lib.concatStringsSep "\n\n" ruleContents;
+
+  # Build a coding rules section suitable for appending to AGENTS.md.
+  # Wraps concatRulesMd output with a header and HTML comment markers
+  # for idempotent updates in project-level shellHooks.
+  #
+  # Args: Same as concatRulesMd
+  #
+  # Returns: A markdown string with start/end markers and a header.
+  mkRulesMdSection = args: let
+    content = concatRulesMd args;
+  in
+    if builtins.stringLength content == 0
+    then ""
+    else ''
+      <!-- CODING-RULES:START -->
+      # Coding Rules
+
+      ${content}
+      <!-- CODING-RULES:END -->
+    '';
 in {
-  inherit mkCodingRules mkOpencodeRules;
+  inherit mkCodingRules concatRulesMd mkRulesMdSection;
 }

lib/default.nix

@@ -7,12 +7,9 @@
   # Port management utilities
   ports = import ./ports.nix {inherit lib;};
 
-  # Coding rules injection utilities (renamed from opencode-rules)
+  # Coding rules injection utilities
   coding-rules = import ./coding-rules.nix {inherit lib;};
 
-  # Backward-compat alias: opencode-rules → coding-rules
-  opencode-rules = import ./coding-rules.nix {inherit lib;};
-
   # Agent configuration management utilities
   agents = import ./agents.nix {inherit lib;};
 }

lib/opencode-rules.nix

@@ -1,116 +0,0 @@
-# Opencode rules management utilities
-#
-# This module provides functions to configure Opencode agent rules across
-# multiple projects. Rules are defined in the AGENTS repository and can be
-# selectively included based on language, framework, and concerns.
-#
-# Usage in your configuration:
-#
-#   # In your flake or configuration:
-#   let
-#     m3taLib = inputs.m3ta-nixpkgs.lib.${system};
-#
-#     rules = m3taLib.opencode-rules.mkOpencodeRules {
-#       agents = inputs.agents;
-#       languages = [ "python" "typescript" ];
-#       concerns = [ "coding-style" "naming" "documentation" ];
-#       frameworks = [ "react" "fastapi" ];
-#     };
-#   in {
-#     # Use in your devShell:
-#     devShells.default = pkgs.mkShell {
-#       shellHook = rules.shellHook;
-#       inherit (rules) instructions;
-#     };
-#   }
-#
-# The shellHook creates:
-#   - A `.opencode-rules/` symlink pointing to the AGENTS repository rules directory
-#   - An `opencode.json` file with a $schema reference and instructions list
-#
-# The instructions list contains paths relative to the project root, all prefixed
-# with `.opencode-rules/`, making them portable across different project locations.
-{lib}: {
-  # Create Opencode rules configuration from AGENTS repository
-  #
-  # Args:
-  #   agents: Path to the AGENTS repository (non-flake input)
-  #   languages: Optional list of language-specific rules to include
-  #              (e.g., [ "python" "typescript" "rust" ])
-  #   concerns: Optional list of concern rules to include
-  #             Default: [ "coding-style" "naming" "documentation" "testing" "git-workflow" "project-structure" ]
-  #   frameworks: Optional list of framework-specific rules to include
-  #               (e.g., [ "react" "fastapi" "django" ])
-  #   extraInstructions: Optional list of additional instruction paths
-  #                      (for custom rules outside standard locations)
-  #
-  # Returns:
-  #   An attribute set containing:
-  #     - shellHook: Bash code to create symlink and opencode.json
-  #     - instructions: List of rule file paths (relative to project root)
-  #
-  # Example:
-  #   mkOpencodeRules {
-  #     agents = inputs.agents;
-  #     languages = [ "python" ];
-  #     frameworks = [ "fastapi" ];
-  #   }
-  #   # Returns:
-  #   # {
-  #   #   shellHook = "...";
-  #   #   instructions = [
-  #   #     ".opencode-rules/concerns/coding-style.md"
-  #   #     ".opencode-rules/concerns/naming.md"
-  #   #     ".opencode-rules/concerns/documentation.md"
-  #   #     ".opencode-rules/concerns/testing.md"
-  #   #     ".opencode-rules/concerns/git-workflow.md"
-  #   #     ".opencode-rules/concerns/project-structure.md"
-  #   #     ".opencode-rules/languages/python.md"
-  #   #     ".opencode-rules/frameworks/fastapi.md"
-  #   #   ];
-  #   # }
-  mkOpencodeRules = {
-    agents,
-    languages ? [],
-    concerns ? [
-      "coding-style"
-      "naming"
-      "documentation"
-      "testing"
-      "git-workflow"
-      "project-structure"
-    ],
-    frameworks ? [],
-    extraInstructions ? [],
-  }: let
-    rulesDir = ".opencode-rules";
-
-    # Build instructions list by mapping concerns, languages, frameworks to their file paths
-    # All paths are relative to project root via the rulesDir symlink
-    instructions =
-      (map (c: "${rulesDir}/concerns/${c}.md") concerns)
-      ++ (map (l: "${rulesDir}/languages/${l}.md") languages)
-      ++ (map (f: "${rulesDir}/frameworks/${f}.md") frameworks)
-      ++ extraInstructions;
-
-    # Generate JSON configuration for Opencode
-    opencodeConfig = {
-      "$schema" = "https://opencode.ai/config.json";
-      inherit instructions;
-    };
-  in {
-    inherit instructions;
-
-    # Shell hook to set up rules in the project
-    # Creates a symlink to the AGENTS rules directory and generates opencode.json
-    shellHook = ''
-      # Create/update symlink to AGENTS rules directory
-      ln -sfn ${agents}/rules ${rulesDir}
-
-      # Generate opencode.json configuration file
-      cat > opencode.json <<'OPENCODE_EOF'
-      ${builtins.toJSON opencodeConfig}
-      OPENCODE_EOF
-    '';
-  };
-}

lib/ports.nix

@@ -95,19 +95,4 @@
     #   List of service names (strings)
     listServices = lib.attrNames ports;
   };
-
-  # Simple helper to get a port without host override
-  # Useful when you don't need host-specific ports
-  #
-  # Args:
-  #   portsConfig: Same structure as mkPortHelpers
-  #   service: The service name (string)
-  #
-  # Returns:
-  #   Port number (int) or null if service not found
-  #
-  # Example:
-  #   getDefaultPort myPorts "nginx"  # Returns default port only
-  getDefaultPort = portsConfig: service:
-    portsConfig.ports.${service} or null;
 }

modules/home-manager/AGENTS.md

@@ -163,7 +163,7 @@ The agent system was migrated from embedded `agents.json` to file-based canonica
 | `coding.opencode.externalSkills` | `coding.agents.opencode.externalSkills` |
 | Agents embedded in `config.json` | File-based `~/.config/opencode/agents/*.md` |
 | Model hardcoded in `agents.json` | Per-machine `modelOverrides` |
-| `mkOpencodeRules` | `mkCodingRules` (old name still works) |
+| `mkOpencodeRules` | `mkCodingRules` |
 
 ### Migration steps
 

modules/home-manager/coding/agents/claude-code.nix

@@ -3,42 +3,34 @@
   lib,
   pkgs,
   ...
-}:
-with lib; let
-  cfg = config.coding.agents.claude-code;
+}: {
+  imports = [
+    ./shared/default.nix
+  ];
+
+  options.coding.agents.claude-code = let
+    shared = import ./shared/shared-options.nix {inherit lib;};
     mcpCfg = config.programs.mcp or null;
-in {
-  options.coding.agents.claude-code = {
+  in
+    with lib; {
       enable = mkEnableOption "Claude Code agent management via canonical agent.toml definitions";
 
-    agentsInput = mkOption {
-      type = types.nullOr types.anything;
-      default = null;
-      description = ''
+      agentsInput = shared.mkAgentsInputOption ''
         The `agents` flake input (your personal AGENTS repo).
         When set, agents are rendered from canonical agent.toml files
         and symlinked to ~/.claude/agents/.
       '';
-    };
 
-    modelOverrides = mkOption {
-      type = types.attrsOf types.str;
-      default = {};
-      description = ''
-        Per-agent model overrides. Maps agent slug to model alias or ID.
-        Example: { chiron = "claude-sonnet-4-20250514"; }
-      '';
-      example = literalExpression ''
-        {
-          chiron = "claude-sonnet-4-20250514";
-          "chiron-forge" = "claude-sonnet-4-20250514";
-        }
-      '';
-    };
+      modelOverrides = shared.mkModelOverridesOption;
+
+      externalSkills = shared.externalSkillsOption;
 
       mcpServers = mkOption {
         type = types.attrsOf types.anything;
-      default = if mcpCfg != null then mcpCfg.servers else {};
+        default =
+          if mcpCfg != null
+          then mcpCfg.servers
+          else {};
         defaultText = literalExpression "config.programs.mcp.servers";
         description = ''
           MCP server configurations for Claude Code.
@@ -48,9 +40,12 @@ in {
       };
     };
 
-  config = mkIf cfg.enable (let
+  config = with lib; let
+    shared = import ./shared/shared-options.nix {inherit lib;};
+    cfg = config.coding.agents.claude-code;
     agentsLib = (import ../../../../lib {inherit lib;}).agents;
-
+  in
+    mkIf cfg.enable (let
       # Rendered agents + permissions (only if agentsInput is set)
       rendered = mkIf (cfg.agentsInput != null) (
         agentsLib.renderForClaudeCode {
@@ -82,6 +77,15 @@ in {
         source = "${rendered}/.claude/agents";
       };
 
+      # Skills (merged from personal AGENTS repo + optional external skills)
+      home.file.".claude/skills" = mkIf (cfg.agentsInput != null) {
+        source = cfg.agentsInput.lib.mkOpencodeSkills {
+          inherit pkgs;
+          customSkills = "${cfg.agentsInput}/skills";
+          externalSkills = shared.mapExternalSkills cfg.externalSkills;
+        };
+      };
+
       # Rendered settings.json with permissions + MCP servers
       home.file.".claude/settings.json" = mkIf (settingsJson != null) {
         source = "${settingsJson}";

modules/home-manager/coding/agents/default.nix

@@ -1,10 +1,39 @@
 # Per-tool agent sub-modules
 # Each module handles rendering canonical agent.toml definitions
 # for a specific AI coding tool.
+#
+# Also provides the shared coding.agents.skills submodule that writes
+# ~/.agents/skills — the central skills directory used by Pi, OpenCode, etc.
 {
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  shared = import ./shared/shared-options.nix {inherit lib;};
+  cfg = config.coding.agents.skills;
+  mkIf = lib.mkIf;
+in {
   imports = [
     ./opencode.nix
     ./claude-code.nix
     ./pi.nix
   ];
+
+  options.coding.agents.skills = {
+    agentsInput = shared.mkAgentsInputOption ''
+      The `agents` flake input (your personal AGENTS repo).
+      When set, skills are symlinked to ~/.agents/skills.
+    '';
+
+    externalSkills = shared.externalSkillsOption;
+  };
+
+  config = mkIf (cfg.agentsInput != null) {
+    home.file.".agents/skills".source = cfg.agentsInput.lib.mkOpencodeSkills {
+      inherit pkgs;
+      customSkills = "${cfg.agentsInput}/skills";
+      externalSkills = shared.mapExternalSkills cfg.externalSkills;
+    };
+  };
 }

modules/home-manager/coding/agents/opencode.nix

@@ -3,102 +3,43 @@
   lib,
   pkgs,
   ...
-}:
-with lib; let
-  cfg = config.coding.agents.opencode;
-in {
-  options.coding.agents.opencode = {
+}: {
+  imports = [
+    ./shared/default.nix
+  ];
+
+  options.coding.agents.opencode = let
+    shared = import ./shared/shared-options.nix {inherit lib;};
+  in
+    with lib; {
       enable = mkEnableOption "OpenCode agent management via canonical agent.toml definitions";
 
-    agentsInput = mkOption {
-      type = types.nullOr types.anything;
-      default = null;
-      description = ''
+      agentsInput = shared.mkAgentsInputOption ''
         The `agents` flake input (your personal AGENTS repo).
         When set, agents are rendered from canonical agent.toml files
         and symlinked to ~/.config/opencode/agents/.
       '';
+
+      modelOverrides = shared.mkModelOverridesOption;
     };
 
-    modelOverrides = mkOption {
-      type = types.attrsOf types.str;
-      default = {};
-      description = ''
-        Per-agent model overrides. Maps agent slug to model string.
-        Example: { chiron = "anthropic/claude-sonnet-4"; }
-      '';
-      example = literalExpression ''
-        {
-          chiron = "anthropic/claude-sonnet-4";
-          "chiron-forge" = "anthropic/claude-sonnet-4";
-        }
-      '';
-    };
-
-    externalSkills = mkOption {
-      type = types.listOf (types.submodule {
-        options = {
-          src = mkOption {
-            type = types.anything;
-            description = "Flake input pointing to a skills repository root.";
-          };
-          skillsDir = mkOption {
-            type = types.str;
-            default = "skills";
-            description = ''
-              Subdirectory inside src that contains skill folders.
-            '';
-          };
-          selectSkills = mkOption {
-            type = types.nullOr (types.listOf types.str);
-            default = null;
-            description = ''
-              List of skill names to cherry-pick from this source.
-              null means include every skill found in skillsDir.
-            '';
-          };
-        };
-      });
-      default = [];
-      description = ''
-        External skill sources passed to mkOpencodeSkills.
-        Each entry maps directly to an element of the externalSkills
-        list accepted by the AGENTS flake's lib.mkOpencodeSkills.
-      '';
-      example = literalExpression ''
-        [
-          { src = inputs.skills-anthropic; selectSkills = [ "claude-api" ]; }
-          { src = inputs.skills-vercel; }
-        ]
-      '';
-    };
-  };
-
-  config = mkIf cfg.enable {
+  config = with lib; let
+    shared = import ./shared/shared-options.nix {inherit lib;};
+    cfg = config.coding.agents.opencode;
+  in
+    mkIf cfg.enable {
       # Rendered agent files symlinked to ~/.config/opencode/agents/
-    xdg.configFile."opencode/agents" = mkIf (cfg.agentsInput != null) {
-      source = (import ../../../../lib {inherit lib;}).agents.renderForOpencode {
+      xdg.configFile."opencode/agents" = let
+        agentsLib = (import ../../../../lib {inherit lib;}).agents;
+      in
+        mkIf (cfg.agentsInput != null) {
+          source = agentsLib.renderForOpencode {
             inherit pkgs;
             canonical = cfg.agentsInput.lib.loadAgents;
             modelOverrides = cfg.modelOverrides;
           };
         };
 
-    # Skills (merged from personal AGENTS repo + optional external skills)
-    xdg.configFile."opencode/skills" = mkIf (cfg.agentsInput != null) {
-      source = cfg.agentsInput.lib.mkOpencodeSkills {
-        inherit pkgs;
-        customSkills = "${cfg.agentsInput}/skills";
-        externalSkills =
-          map (
-            entry:
-              {inherit (entry) src skillsDir;}
-              // optionalAttrs (entry.selectSkills != null) {inherit (entry) selectSkills;}
-          )
-          cfg.externalSkills;
-      };
-    };
-
       # Static config dirs from AGENTS repo
       xdg.configFile."opencode/context" = mkIf (cfg.agentsInput != null) {
         source = "${cfg.agentsInput}/context";

modules/home-manager/coding/agents/pi.nix

@@ -3,17 +3,24 @@
   lib,
   pkgs,
   ...
-}:
-with lib; let
-  cfg = config.coding.agents.pi;
+}: {
+  imports = [
+    ./shared/default.nix
+  ];
+
+  options.coding.agents.pi = let
+    shared = import ./shared/shared-options.nix {inherit lib;};
     mcpCfg = config.programs.mcp or null;
-in {
-  options.coding.agents.pi = {
+  in
+    with lib; {
       enable = mkEnableOption "Pi agent management via canonical agent.toml definitions";
 
       mcpServers = mkOption {
         type = types.attrsOf types.anything;
-      default = if mcpCfg != null then mcpCfg.servers else {};
+        default =
+          if mcpCfg != null
+          then mcpCfg.servers
+          else {};
         defaultText = literalExpression "config.programs.mcp.servers";
         description = ''
           MCP server configurations for Pi (pi-mcp-adapter).
@@ -22,25 +29,13 @@ in {
         '';
       };
 
-    agentsInput = mkOption {
-      type = types.nullOr types.anything;
-      default = null;
-      description = ''
+      agentsInput = shared.mkAgentsInputOption ''
         The `agents` flake input (your personal AGENTS repo).
         When set, the primary agent's system prompt is rendered as SYSTEM.md,
         all agents are listed in AGENTS.md, and subagent .md files are deployed.
       '';
-    };
 
-    modelOverrides = mkOption {
-      type = types.attrsOf types.str;
-      default = {};
-      description = ''
-        Per-agent model overrides for Pi subagents.
-        Maps agent slug to model string, e.g.:
-          { chiron = "anthropic/claude-sonnet-4"; chiron-forge = "anthropic/claude-sonnet-4"; }
-      '';
-    };
+      modelOverrides = shared.mkModelOverridesOption;
 
       primaryAgent = mkOption {
         type = types.nullOr types.str;
@@ -51,6 +46,60 @@ in {
         '';
       };
 
+      codingRules = mkOption {
+        type = types.nullOr (types.submodule {
+          options = {
+            languages = mkOption {
+              type = types.listOf types.str;
+              default = [];
+              description = ''
+                Language-specific coding rules to include
+                (e.g. [ "python" "typescript" "nix" ]).
+                Rule files are read from the AGENTS repo's rules/languages/ directory.
+              '';
+            };
+
+            concerns = mkOption {
+              type = types.listOf types.str;
+              default = [
+                "coding-style"
+                "naming"
+                "documentation"
+                "testing"
+                "git-workflow"
+                "project-structure"
+              ];
+              description = ''
+                Concern rules to include from the AGENTS repo's rules/concerns/ directory.
+              '';
+            };
+
+            frameworks = mkOption {
+              type = types.listOf types.str;
+              default = [];
+              description = ''
+                Framework-specific coding rules to include
+                (e.g. [ "react" "fastapi" ]).
+                Rule files are read from the AGENTS repo's rules/frameworks/ directory.
+              '';
+            };
+          };
+        });
+        default = null;
+        description = ''
+          Coding rules to inject into ~/.pi/agent/AGENTS.md.
+          Rules are read from the AGENTS repository and appended as markdown sections.
+          Requires agentsInput to be set.
+        '';
+        example = literalExpression ''
+          {
+            languages = [ "python" "typescript" ];
+            concerns = [ "coding-style" "testing" ];
+            frameworks = [ "fastapi" ];
+          }
+        '';
+      };
+
       settings = mkOption {
         type = types.submodule {
           freeformType = types.attrsOf types.anything;
@@ -153,9 +202,45 @@ in {
           See pi docs/settings.md for all options.
         '';
       };
+
+      # ── Pi Guardrails ─────────────────────────────────────────────
+      guardrails = mkOption {
+        type = types.nullOr (types.submodule {
+          options = {
+            enable =
+              mkEnableOption
+              ("Generate ~/.pi/agent/extensions/guardrails.json for pi-guardrails. "
+                + "Adds @aliou/pi-guardrails to packages automatically.");
+
+            config = mkOption {
+              type = types.attrsOf types.anything;
+              default = {};
+              description = ''
+                Guardrails configuration written to ~/.pi/agent/extensions/guardrails.json.
+                See https://github.com/aliou/pi-guardrails for config schema.
+
+                IMPORTANT: Path access checks are lexical (not symlink-safe).
+                Local project .pi/extensions/guardrails.json can override same rule IDs
+                (memory > local > global > defaults). For immutable global policies,
+                consider a wrapper or upstream patch.
+              '';
+            };
+          };
+        });
+        default = null;
+        description = ''
+          Pi Guardrails security configuration.
+          Generates ~/.pi/agent/extensions/guardrails.json when enabled.
+          The @aliou/pi-guardrails package is added to settings.packages automatically.
+        '';
+      };
     };
 
-  config = mkIf cfg.enable (let
+  config = with lib; let
+    shared = import ./shared/shared-options.nix {inherit lib;};
+    cfg = config.coding.agents.pi;
+  in
+    mkIf cfg.enable (let
       # Build settings.json by filtering out null values recursively
       filterNulls = attrs:
         lib.filterAttrs (_: v: v != null) (
@@ -164,12 +249,50 @@ in {
             then let
               filtered = filterNulls v;
             in
-            if filtered == {} then null else filtered
-          else v) attrs
+              if filtered == {}
+              then null
+              else filtered
+            else v)
+          attrs
         );
 
+      # Base settings (already filtered)
       piSettings = filterNulls cfg.settings;
 
+      # Guardrails package to inject when guardrails is enabled
+      guardrailsPackage = "npm:@aliou/pi-guardrails@0.11.1";
+
+      # Guardrails config (only when guardrails is enabled)
+      guardrailsJson =
+        if (cfg.guardrails != null && cfg.guardrails.enable)
+        then builtins.toJSON cfg.guardrails.config
+        else null;
+
+      # Merge guardrails package into settings.packages when guardrails is enabled
+      piSettingsWithGuardrails = let
+        baseSettings = cfg.settings;
+        basePackages = baseSettings.packages or [];
+        hasGuardrailsPackage =
+          lib.any
+          (p:
+            lib.hasPrefix "npm:@aliou/pi-guardrails" p
+            || (lib.hasPrefix "git:" p && lib.hasSuffix "/pi-guardrails" p))
+          basePackages;
+        packagesWithGuardrails =
+          if (cfg.guardrails != null && cfg.guardrails.enable && !hasGuardrailsPackage)
+          then basePackages ++ [guardrailsPackage]
+          else basePackages;
+      in
+        if packagesWithGuardrails != basePackages
+        then filterNulls (baseSettings // {packages = packagesWithGuardrails;})
+        else piSettings;
+
+      # Coding rules config for renderForPi (only when both agentsInput and codingRules are set)
+      piCodingRules =
+        if cfg.agentsInput != null && cfg.codingRules != null
+        then cfg.codingRules // {agents = cfg.agentsInput;}
+        else null;
+
       # Rendered agents (only computed when agentsInput is set)
       rendered =
         if cfg.agentsInput != null
@@ -179,14 +302,14 @@ in {
             canonical = cfg.agentsInput.lib.loadAgents;
             modelOverrides = cfg.modelOverrides;
             primaryAgent = cfg.primaryAgent;
+            codingRules = piCodingRules;
           }
         else null;
 
       # Dynamic home.file entries for agent .md files
       agentFiles =
         if cfg.agentsInput != null
-      then
-        let
+        then let
           agentNames = builtins.attrNames cfg.agentsInput.lib.loadAgents;
         in
           builtins.listToAttrs (
@@ -202,13 +325,21 @@ in {
         # ── MCP servers from programs.mcp → ~/.pi/agent/mcp.json ───────
         (mkIf (cfg.mcpServers != {}) {
           ".pi/agent/mcp.json".text = builtins.toJSON {mcpServers = cfg.mcpServers;};
+          ".pi/agent/mcp.json".force = true;
         })
 
         # ── ~/.pi/agent/settings.json ──────────────────────────────────
         {
-        ".pi/agent/settings.json".text = builtins.toJSON piSettings;
+          ".pi/agent/settings.json".text = builtins.toJSON piSettingsWithGuardrails;
+          ".pi/agent/settings.json".force = true;
         }
 
+        # ── pi-guardrails config ─────────────────────────────────────
+        (mkIf (guardrailsJson != null) {
+          ".pi/agent/extensions/guardrails.json".text = guardrailsJson;
+          ".pi/agent/extensions/guardrails.json".force = true;
+        })
+
         # ── AGENTS.md — agent descriptions and specialist listing ──────
         (mkIf (cfg.agentsInput != null) {
           ".pi/agent/AGENTS.md".source = "${rendered}/AGENTS.md";
@@ -221,14 +352,6 @@ in {
 
         # ── Agents — pi-subagents .md files ────────────────────────────
         agentFiles
-
-      # ── Skills symlinked from AGENTS repo ──────────────────────────
-      (mkIf (cfg.agentsInput != null) {
-        ".pi/agent/skills".source = cfg.agentsInput.lib.mkOpencodeSkills {
-          inherit pkgs;
-          customSkills = "${cfg.agentsInput}/skills";
-        };
-      })
       ];
     });
 }

modules/home-manager/coding/agents/shared/default.nix

@@ -0,0 +1,7 @@
+# Shared agent module exports
+# Imports all shared modules for the coding.agents namespace.
+{
+  imports = [
+    ./git-identity.nix
+  ];
+}

modules/home-manager/coding/agents/shared/git-identity.nix

@@ -0,0 +1,64 @@
+# Git identity module for agent commits.
+# Sets GIT_AUTHOR_*, GIT_COMMITTER_*, and GIT_SSH_COMMAND environment variables.
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}: let
+  cfg = config.coding.agents.gitIdentity;
+in {
+  options.coding.agents.gitIdentity = {
+    enable = lib.mkEnableOption ''
+      Agent Git identity for commits. When enabled, sets GIT_AUTHOR_* and
+      GIT_COMMITTER_* environment variables for consistent bot identity.
+    '';
+
+    name = lib.mkOption {
+      type = lib.types.str;
+      default = "m3ta-chiron";
+      description = "Git user name for agent commits.";
+      example = "m3ta-chiron";
+    };
+
+    email = lib.mkOption {
+      type = lib.types.str;
+      default = "m3ta-chiron@agentmail.to";
+      description = "Git email for agent commits.";
+      example = "m3ta-chiron@agentmail.to";
+    };
+
+    signingKey = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      default = null;
+      description = ''
+        Optional GPG signing key for verified commits.
+        Set to null to disable signing.
+      '';
+      example = "/home/user/.gnupg/sign_key.gpg";
+    };
+
+    sshKey = lib.mkOption {
+      type = lib.types.path;
+      description = ''
+        Path to SSH private key for git push authentication.
+        Use agenix-managed paths like /run/agenix/m3ta-chiron-ssh-key
+        for secure secret management.
+      '';
+      example = "/run/agenix/m3ta-chiron-ssh-key";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.sessionVariables = {
+      # Git author/committer identity
+      GIT_AUTHOR_NAME = cfg.name;
+      GIT_AUTHOR_EMAIL = cfg.email;
+      GIT_COMMITTER_NAME = cfg.name;
+      GIT_COMMITTER_EMAIL = cfg.email;
+
+      # SSH command for git push
+      GIT_SSH_COMMAND = "ssh -i ${cfg.sshKey} -o IdentitiesOnly=yes -o StrictHostKeyChecking=accept-new";
+    };
+  };
+}

modules/home-manager/coding/agents/shared/shared-options.nix

@@ -0,0 +1,77 @@
+# Shared option definitions for agent modules.
+# Prevents copy-pasting the externalSkills submodule across opencode/claude-code/pi.
+{lib}: let
+  inherit (lib) mkOption mkEnableOption types literalExpression;
+in {
+  # Common agentsInput option used by all agent modules.
+  mkAgentsInputOption = description:
+    mkOption {
+      type = types.nullOr types.anything;
+      default = null;
+      inherit description;
+    };
+
+  # Common modelOverrides option.
+  mkModelOverridesOption = mkOption {
+    type = types.attrsOf types.str;
+    default = {};
+    description = ''
+      Per-agent model overrides. Maps agent slug to model string.
+      Example: { chiron = "anthropic/claude-sonnet-4"; }
+    '';
+    example = literalExpression ''
+      {
+        chiron = "anthropic/claude-sonnet-4";
+        "chiron-forge" = "anthropic/claude-sonnet-4";
+      }
+    '';
+  };
+
+  # External skills submodule — used by opencode, claude-code, and pi modules.
+  externalSkillsOption = mkOption {
+    type = types.listOf (types.submodule {
+      options = {
+        src = mkOption {
+          type = types.anything;
+          description = "Flake input pointing to a skills repository root.";
+        };
+        skillsDir = mkOption {
+          type = types.str;
+          default = "skills";
+          description = ''
+            Subdirectory inside src that contains skill folders.
+          '';
+        };
+        selectSkills = mkOption {
+          type = types.nullOr (types.listOf types.str);
+          default = null;
+          description = ''
+            List of skill names to cherry-pick from this source.
+            null means include every skill found in skillsDir.
+          '';
+        };
+      };
+    });
+    default = [];
+    description = ''
+      External skill sources passed to mkOpencodeSkills.
+      Each entry maps directly to an element of the externalSkills
+      list accepted by the AGENTS flake's lib.mkOpencodeSkills.
+    '';
+    example = literalExpression ''
+      [
+        { src = inputs.skills-anthropic; selectSkills = [ "claude-api" ]; }
+        { src = inputs.basecamp; }
+      ]
+    '';
+  };
+
+  # Helper to map externalSkills from module config to mkOpencodeSkills format.
+  mapExternalSkills = cfgEntries:
+    map (
+      entry:
+        {inherit (entry) src skillsDir;}
+        // lib.optionalAttrs (entry.selectSkills != null) {inherit (entry) selectSkills;}
+    )
+    cfgEntries;
+}

overlays/default.nix

@@ -1,70 +0,0 @@
-{inputs, ...}: {
-  # This one brings our custom packages from the 'pkgs' directory
-  additions = final: prev:
-    (import ../pkgs {pkgs = final;})
-    # // (inputs.hyprpanel.overlay final prev)
-    // {rose-pine-hyprcursor = inputs.rose-pine-hyprcursor.packages.${prev.stdenv.hostPlatform.system}.default;};
-
-  # This one contains whatever you want to overlay
-  # You can change versions, add patches, set compilation flags, anything really.
-  # https://nixos.wiki/wiki/Overlays
-  modifications = final: prev:
-  # Import all package modifications from mods directory
-    (import ./mods/default.nix {inherit prev;})
-    // {
-      # Direct configuration overrides
-      brave = prev.brave.override {
-        commandLineArgs = "--password-store=gnome-libsecret";
-      };
-
-      # nodejs_24 = inputs.nixpkgs-stable.legacyPackages.${prev.system}.nodejs_24;
-      # paperless-ngx = inputs.nixpkgs-45570c2.legacyPackages.${prev.system}.paperless-ngx;
-      # anytype-heart = inputs.nixpkgs-9e58ed7.legacyPackages.${prev.system}.anytype-heart;
-      # trezord = inputs.nixpkgs-2744d98.legacyPackages.${prev.system}.trezord;
-      # mesa = inputs.nixpkgs-master.legacyPackages.${prev.system}.mesa;
-      # hyprpanel = inputs.hyprpanel.packages.${prev.system}.default.overrideAttrs (prev: {
-      #   version = "latest"; # or whatever version you want
-      #   src = final.fetchFromGitHub {
-      #     owner = "Jas-SinghFSU";
-      #     repo = "HyprPanel";
-      #     rev = "master"; # or a specific commit hash
-      #     hash = "sha256-l623fIVhVCU/ylbBmohAtQNbK0YrWlEny0sC/vBJ+dU=";
-      #   };
-      # });
-    };
-
-  temp-packages = final: _prev: {
-    temp = import inputs.nixpkgs-9e9486b {
-      system = final.stdenv.hostPlatform.system;
-      config.allowUnfree = true;
-    };
-  };
-
-  stable-packages = final: _prev: {
-    stable = import inputs.nixpkgs-stable {
-      system = final.stdenv.hostPlatform.system;
-      config.allowUnfree = true;
-    };
-  };
-
-  pinned-packages = final: _prev: {
-    pinned = import inputs.nixpkgs-9472de4 {
-      system = final.stdenv.hostPlatform.system;
-      config.allowUnfree = true;
-    };
-  };
-
-  locked-packages = final: _prev: {
-    locked = import inputs.nixpkgs-locked {
-      system = final.stdenv.hostPlatform.system;
-      config.allowUnfree = true;
-    };
-  };
-
-  master-packages = final: _prev: {
-    master = import inputs.nixpkgs-master {
-      system = final.stdenv.hostPlatform.system;
-      config.allowUnfree = true;
-    };
-  };
-}

overlays/mods/beads.nix

@@ -1,16 +0,0 @@
-{prev}:
-prev.beads.overrideAttrs (oldAttrs: rec {
-  version = "0.47.1";
-
-  src = prev.fetchFromGitHub {
-    owner = "steveyegge";
-    repo = "beads";
-    tag = "v${version}";
-    hash = "sha256-DwIR/r1TJnpVd/CT1E2OTkAjU7k9/KHbcVwg5zziFVg=";
-  };
-
-  vendorHash = "sha256-pY5m5ODRgqghyELRwwxOr+xlW41gtJWLXaW53GlLaFw=";
-
-  # Tests require git worktree operations that fail in Nix sandbox
-  doCheck = false;
-})

overlays/mods/default.nix

@@ -2,9 +2,6 @@
   # Package modifications
   # This overlay contains package overrides and modifications
 
-  # n8n = import ./n8n.nix {inherit prev;};
-  # beads = import ./beads.nix {inherit prev;};
-
   # Add more modifications here as needed
   # example-package = prev.example-package.override { ... };
 }

overlays/mods/n8n.nix

@@ -1,18 +0,0 @@
-{prev}:
-prev.n8n.overrideAttrs (oldAttrs: rec {
-  version = "2.4.1";
-
-  src = prev.fetchFromGitHub {
-    owner = "n8n-io";
-    repo = "n8n";
-    rev = "n8n@${version}";
-    hash = "sha256-EQP9ZI8kt30SUYE1+/UUpxQXpavzKqDu8qE24zsNifg=";
-  };
-
-  pnpmDeps = prev.pnpm_10.fetchDeps {
-    pname = oldAttrs.pname;
-    inherit version src;
-    fetcherVersion = 1;
-    hash = "sha256-Q30IuFEQD3896Hg0HCLd38YE2i8fJn74JY0o95LKJis=";
-  };
-})

pkgs/code2prompt/default.nix

@@ -1,40 +0,0 @@
-{
-  lib,
-  fetchFromGitHub,
-  nix-update-script,
-  rustPlatform,
-  pkg-config,
-  perl,
-  openssl,
-}:
-rustPlatform.buildRustPackage rec {
-  pname = "code2prompt";
-  version = "4.2.0";
-
-  src = fetchFromGitHub {
-    owner = "mufeedvh";
-    repo = "code2prompt";
-    rev = "v${version}";
-    hash = "sha256-Gh8SsSTZW7QlyyC3SWJ5pOK2x85/GT7+LPJn2Jeczpc=";
-  };
-
-  cargoLock = {
-    lockFile = src + "/Cargo.lock";
-  };
-
-  buildAndTestSubdir = "crates/code2prompt";
-
-  nativeBuildInputs = [pkg-config perl];
-
-  buildInputs = [openssl];
-
-  passthru.updateScript = nix-update-script {};
-
-  meta = with lib; {
-    description = "A CLI tool that converts your codebase into a single LLM prompt with a source tree, prompt templating, and token counting";
-    homepage = "https://github.com/mufeedvh/code2prompt";
-    license = licenses.mit;
-    platforms = platforms.linux;
-    mainProgram = "code2prompt";
-  };
-}

pkgs/default.nix

@@ -1,3 +1,10 @@
+# m3ta-nixpkgs package registry
+#
+# Flake inputs used:
+#   inputs.basecamp  → basecamp (pass-through)
+#   inputs.openspec → openspec (pass-through)
+#   inputs.opencode → opencode-desktop (build inputs + patches)
+#   inputs.agents   → not used directly here (used by lib/)
 {
   pkgs,
   inputs,
@@ -5,11 +12,12 @@
 }: let
   system = pkgs.stdenv.hostPlatform.system;
 in {
-  # Custom packages registry
-  # Each package is defined in its own directory under pkgs/
+  # ── Local packages ────────────────────────────────────────────────
+  # Standard packages built from source in ./<name>/default.nix.
+  # No flake inputs required.
+
   sidecar = pkgs.callPackage ./sidecar {};
   td = pkgs.callPackage ./td {};
-  code2prompt = pkgs.callPackage ./code2prompt {};
   eigent = pkgs.callPackage ./eigent {};
   hyprpaper-random = pkgs.callPackage ./hyprpaper-random {};
   launch-webapp = pkgs.callPackage ./launch-webapp {};
@@ -25,11 +33,9 @@ in {
   zellij-ps = pkgs.callPackage ./zellij-ps {};
   vibetyper = pkgs.callPackage ./vibetyper {};
 
-  # Imported from flake inputs (pass-through, no modifications)
+  # ── Pass-through packages ──────────────────────────────────────────
+  # Imported directly from flake inputs. No local modifications.
+
   basecamp = inputs.basecamp.packages.${system}.default;
   openspec = inputs.openspec.packages.${system}.default;
-
-  # Imported from flake inputs (with local modifications)
-  opencode-desktop = pkgs.callPackage ./opencode-desktop {inherit inputs;};
-  # opencode-desktop = inputs.opencode.packages.${pkgs.system}.desktop;
 }

pkgs/eigent/default.nix

@@ -8,10 +8,10 @@
   nix-update-script,
 }: let
   pname = "eigent";
-  version = "0.0.89";
+  version = "0.0.90";
   src = fetchurl {
     url = "https://github.com/eigent-ai/eigent/releases/download/v${version}/Eigent-${version}.AppImage";
-    hash = "sha256-9KuiFjegfXhCu1W/FCinWX4ae/DsNPudeBcXFfW18Hc=";
+    hash = "sha256-mwCBx+D6mgGqQa8bDuUpo3h49EwFVkwasJwaYc6aXFE=";
   };
   appimageContents = appimageTools.extractType2 {inherit pname version src;};
 in

pkgs/kestractl/sources.json

@@ -1,13 +1,13 @@
 {
-  "version": "1.2.2",
+  "version": "1.3.0",
   "sources": {
     "aarch64-linux": {
-      "url": "https://github.com/kestra-io/kestractl/releases/download/1.2.2/kestractl_1.2.2_linux_arm64.tar.gz",
-      "hash": "sha256-sidFsCZPnJ07PM5QayPBqaqlBBJTLEdecfd0AWnL7Yo="
+      "url": "https://github.com/kestra-io/kestractl/releases/download/1.3.0/kestractl_1.3.0_linux_arm64.tar.gz",
+      "hash": "sha256-/18F6CZnnLbet4BmI1oQ5pZWkJwIshCq30qd+cm0GGA="
     },
     "x86_64-linux": {
-      "url": "https://github.com/kestra-io/kestractl/releases/download/1.2.2/kestractl_1.2.2_linux_amd64.tar.gz",
-      "hash": "sha256-0C2naN2ougBJSY2z2m6eORnLkLen87HD+a+gvtrUvdw="
+      "url": "https://github.com/kestra-io/kestractl/releases/download/1.3.0/kestractl_1.3.0_linux_amd64.tar.gz",
+      "hash": "sha256-xmsBiqNKvob8xHDyU253o6c25YIubHanNdLqzWaOvSA="
     }
   }
 }

pkgs/mem0/default.nix

@@ -6,14 +6,14 @@
 }:
 python3.pkgs.buildPythonPackage rec {
   pname = "mem0ai";
-  version = "1.0.9";
+  version = "2.0.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "mem0ai";
     repo = "mem0";
     rev = "v${version}";
-    hash = "sha256-tcWH5VbjIBSHinfjirxbUhxqgU0xOUlcHTQHraMuALg=";
+    hash = "sha256-lNSE0Yit+FmM8opC4XYtfVef7JfGd3wMKbLj67Kp4Qw=";
   };
 
   # Relax Python dependency version constraints

pkgs/n8n/default.nix

@@ -11,6 +11,7 @@
   node-gyp,
   cctools,
   xcbuild,
+  dart-sass,
   libkrb5,
   libmongocrypt,
   libpq,
@@ -25,20 +26,20 @@
 in
   stdenv.mkDerivation (finalAttrs: {
     pname = "n8n";
-    version = "stable";
+    version = "2.18.5";
 
     src = fetchFromGitHub {
       owner = "n8n-io";
       repo = "n8n";
-      tag = "${finalAttrs.version}";
-      hash = "sha256-/atba0ymCqhh5Rt61UxwC2xf8SGrRsEKtlsDCIkg37Y=";
+      tag = "n8n@${finalAttrs.version}";
+      hash = "sha256-ws0DXGQFR+z3nVyd4Yn9pIM7yh+H6GnuCRSLxgvtPxo=";
     };
 
     pnpmDeps = fetchPnpmDeps {
       inherit (finalAttrs) pname version src;
       pnpm = pnpm_10;
       fetcherVersion = 3;
-      hash = "sha256-YGplNNvIOIY1BthWmejAzucXujq8AkgPJus774GmWCA=";
+      hash = "sha256-Ajgne0neNm6HgMK6z3jnEkUJJxVOTgzjpSaMaJgIndQ=";
     };
 
     nativeBuildInputs =
@@ -61,6 +62,17 @@ in
       libpq
     ];
 
+    preBuild = ''
+      # Force sass-embedded to use our dart-sass instead of bundled binaries.
+      # The bundled Dart binary can't run in the Nix sandbox (no /lib64/ld-linux-x86-64.so.2).
+      for dep in node_modules/.pnpm/sass-embedded@*; do
+        substituteInPlace "$dep/node_modules/sass-embedded/dist/lib/src/compiler-path.js" \
+          --replace-fail \
+            'compilerCommand = (() => {' \
+            'compilerCommand = (() => { return ["${lib.getExe dart-sass}"];'
+      done
+    '';
+
     buildPhase = ''
       runHook preBuild
 

pkgs/n8n/update.sh

@@ -1,6 +1,29 @@
 #!/usr/bin/env nix-shell
-#!nix-shell --pure -i bash -p bash curl jq nix-update cacert git
+#!nix-shell -i bash -p bash curl jq nix-update cacert git nix
 set -euo pipefail
 
-new_version="$(curl -s "https://api.github.com/repos/n8n-io/n8n/releases/latest" | jq --raw-output '.tag_name | ltrimstr("n8n@")')"
-nix-update n8n --flake --version "$new_version"
+# n8n releases are published with two tags per version:
+#   - "n8n@X.Y.Z" - the versioned tag
+#   - "stable"   - always points to the latest stable version
+#
+# We query the "stable" tag and extract the version from its target commitish (e.g., "release/2.18.5").
+# This ensures we always get the actual latest stable version, not the most recently created tag.
+
+set -euo pipefail
+
+# Get the directory where this script lives (should be pkgs/n8n/)
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Get the nixpkgs root (parent of pkgs/)
+nixpkgs_root="$(cd "$script_dir/../.." && pwd)"
+
+cd "$nixpkgs_root"
+
+# Query the "stable" tag and extract version from target_commitish (e.g., "release/2.18.5")
+new_version=$(curl -s "https://api.github.com/repos/n8n-io/n8n/releases/tags/stable" | jq --raw-output '.target_commitish | ltrimstr("release/")')
+
+echo "Latest stable version: n8n@${new_version}"
+echo "Running from: $(pwd)"
+
+# Use --flake --system to properly evaluate the flake-based package
+nix-update --flake --system x86_64-linux n8n --version "$new_version"

pkgs/opencode-desktop/default.nix

@@ -1,114 +0,0 @@
-{
-  lib,
-  stdenv,
-  symlinkJoin,
-  makeWrapper,
-  rustPlatform,
-  pkg-config,
-  cargo-tauri,
-  bun,
-  nodejs,
-  cargo,
-  rustc,
-  jq,
-  wrapGAppsHook4,
-  dbus,
-  glib,
-  gtk4,
-  libsoup_3,
-  librsvg,
-  libappindicator,
-  glib-networking,
-  openssl,
-  webkitgtk_4_1,
-  gst_all_1,
-  inputs ? null,
-}: let
-  # Get upstream opencode package for shared attributes
-  opencode = inputs.opencode.packages.${stdenv.hostPlatform.system}.default;
-
-  # Workaround for https://github.com/anomalyco/opencode/issues/11755
-  # Upstream is missing outputHashes for git dependencies
-  # Also fix stale npm deps hash in upstream node_modules FOD
-  fixedNodeModules = opencode.node_modules.overrideAttrs {
-    outputHash = "sha256-LRhPPrOKCGUSCEWTpAxPdWKTKVNkg82WrvD25cP3jts=";
-  };
-
-  opencode-desktop = rustPlatform.buildRustPackage (finalAttrs: {
-    pname = "opencode-desktop";
-    version = opencode.version;
-    src = opencode.src;
-    node_modules = fixedNodeModules;
-    patches = opencode.patches;
-
-    cargoRoot = "packages/desktop/src-tauri";
-    cargoLock = {
-      lockFile = finalAttrs.src + "/packages/desktop/src-tauri/Cargo.lock";
-      outputHashes = {
-        "specta-2.0.0-rc.22" = "sha256-YsyOAnXELLKzhNlJ35dHA6KGbs0wTAX/nlQoW8wWyJQ=";
-        "tauri-2.9.5" = "sha256-dv5E/+A49ZBvnUQUkCGGJ21iHrVvrhHKNcpUctivJ8M=";
-        "tauri-specta-2.0.0-rc.21" = "sha256-n2VJ+B1nVrh6zQoZyfMoctqP+Csh7eVHRXwUQuiQjaQ=";
-      };
-    };
-    buildAndTestSubdir = finalAttrs.cargoRoot;
-
-    nativeBuildInputs =
-      [pkg-config cargo-tauri.hook bun nodejs cargo rustc jq makeWrapper]
-      ++ lib.optionals stdenv.hostPlatform.isLinux [wrapGAppsHook4];
-
-    buildInputs = lib.optionals stdenv.isLinux [
-      dbus
-      glib
-      gtk4
-      libsoup_3
-      librsvg
-      libappindicator
-      glib-networking
-      openssl
-      webkitgtk_4_1
-      gst_all_1.gstreamer
-      gst_all_1.gst-plugins-base
-      gst_all_1.gst-plugins-good
-      gst_all_1.gst-plugins-bad
-    ];
-
-    strictDeps = true;
-
-    preBuild = ''
-      cp -a ${finalAttrs.node_modules}/{node_modules,packages} .
-      chmod -R u+w node_modules packages
-      patchShebangs node_modules
-      patchShebangs packages/desktop/node_modules
-
-      mkdir -p packages/desktop/src-tauri/sidecars
-      cp ${opencode}/bin/opencode packages/desktop/src-tauri/sidecars/opencode-cli-${stdenv.hostPlatform.rust.rustcTarget}
-    '';
-
-    tauriBuildFlags = ["--config" "tauri.prod.conf.json" "--no-sign"];
-
-    postFixup = lib.optionalString stdenv.hostPlatform.isLinux ''
-      mv $out/bin/OpenCode $out/bin/opencode-desktop
-      sed -i 's|^Exec=OpenCode$|Exec=opencode-desktop|' $out/share/applications/OpenCode.desktop
-    '';
-  });
-  # Wrapper for Wayland support
-in
-  symlinkJoin {
-    name = "opencode-desktop";
-    paths = [opencode-desktop];
-
-    nativeBuildInputs = [makeWrapper];
-
-    postBuild = ''
-      wrapProgram $out/bin/opencode-desktop \
-        --run 'if [[ "$NIXOS_OZONE_WL" == "1" ]]; then export OC_ALLOW_WAYLAND=1; fi'
-    '';
-
-    meta = {
-      description = "OpenCode Desktop App with Wayland support";
-      homepage = "https://opencode.ai";
-      license = lib.licenses.mit;
-      platforms = lib.platforms.linux;
-      mainProgram = "opencode-desktop";
-    };
-  }

pkgs/sidecar/default.nix

@@ -13,16 +13,16 @@
 }:
 buildGoModule (finalAttrs: {
   pname = "sidecar";
-  version = "0.83.0";
+  version = "0.84.0";
 
   src = fetchFromGitHub {
     owner = "marcus";
     repo = "sidecar";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-L6q2eZO1rNngWwHVhBJ2ftVbvYTConpqYHEb3nwiXxs=";
+    hash = "sha256-80ldZlaZ99ti8dvw+Awev7ucz03iOVD2yzz/+IFHDvA=";
   };
 
-  vendorHash = "sha256-fIaHzc0L4jwVSh/YjrXBB7nENqCgOfHF5bnljFsGbVo=";
+  vendorHash = "sha256-IDD+hQZODNPj+Gy9CX5GFdMcsvt75aFLpabXZehAjaw=";
 
   subPackages = ["cmd/sidecar"];
 

pkgs/td/default.nix

@@ -9,13 +9,13 @@
 }:
 buildGoModule (finalAttrs: {
   pname = "td";
-  version = "0.43.0";
+  version = "0.44.0";
 
   src = fetchFromGitHub {
     owner = "marcus";
     repo = "td";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-DwzuXumEEQWfZW+GbbY9kyqkEFZQ9sC+sSbVxfrY6bM=";
+    hash = "sha256-k1OCK6LE99fHLuxv8HZUW8cSn2Wmk74J7kb6Mi5ZpVw=";
   };
 
   vendorHash = "sha256-hFFG+vLXcL2NNdLQvQZ1hzu++pp5AkbFOPQS10wtsec=";

pkgs/vibetyper/default.nix

@@ -4,10 +4,10 @@
   lib,
 }: let
   pname = "vibetyper";
-  version = "1.2.2";
+  version = "1.2.3";
   src = fetchurl {
     url = "https://cdn.vibetyper.com/releases/linux/VibeTyper.AppImage";
-    sha256 = "sha256-AUjrSVxyaI8Ok4pnoqaW4fGAd4GtSc0mEjDhkqdifY0=";
+    sha256 = "sha256-6uGXw2nxb0sGkcMDTWBlL3PuwBfVodhgqfgZT1Ncs40=";
   };
   appimageContents = appimageTools.extractType2 {inherit pname version src;};
 in

shells/coding.nix

@@ -0,0 +1,109 @@
+# AI coding agent development environment with coding rules
+# Sets up coding rules for OpenCode and Pi, plus useful companion tools.
+# Usage: nix develop .#coding
+#
+# To enable coding rules, add the agents input to your flake:
+#   agents = {
+#     url = "git+https://code.m3ta.dev/m3tam3re/AGENTS";
+#     flake = false;
+#   };
+{
+  pkgs,
+  lib ? pkgs.lib,
+  inputs ? null,
+  agents ? null,
+}: let
+  # Import the coding-rules library
+  m3taLib = import ../lib {lib = pkgs.lib;};
+
+  # Import custom packages
+  customPackages = import ../pkgs {inherit pkgs inputs;};
+
+  # Create rules configuration only if agents input is provided
+  rulesConfig = lib.optionalAttrs (agents != null) {
+    rules = m3taLib.coding-rules.mkCodingRules {
+      inherit agents;
+
+      # Languages relevant to this repository
+      languages = ["nix" "python" "shell"];
+
+      # Frameworks used in this repo
+      frameworks = ["n8n"];
+
+      # Standard concerns for development
+      concerns = [
+        "coding-style"
+        "naming"
+        "documentation"
+        "testing"
+        "git-workflow"
+        "project-structure"
+      ];
+
+      # Also append rules to AGENTS.md for Pi agent discovery
+      forPi = true;
+    };
+  };
+in
+  pkgs.mkShell {
+    name = "coding";
+
+    # Development tools
+    buildInputs = with pkgs; [
+      # Task management for AI coding sessions
+      customPackages.td
+
+      # Companion tool for CLI agents (diffs, file trees, task management)
+      customPackages.sidecar
+
+      # Code analysis tools
+
+      # Nix development tools (for this repo)
+      nil
+      alejandra
+      statix
+      deadnix
+    ];
+
+    shellHook = ''
+      echo "🤖 AI Coding Environment"
+      echo ""
+
+      ${
+        if (agents != null)
+        then ''
+          # Set up coding rules for OpenCode + Pi
+          ${rulesConfig.rules.shellHook}
+
+          echo "✅ Coding rules configured (OpenCode + Pi)"
+          echo "   Languages: nix, python, shell"
+          echo "   Frameworks: n8n"
+          echo "   Concerns: coding-style, naming, documentation, testing, git-workflow, project-structure"
+        ''
+        else ''
+          echo "⚠️  Coding rules not configured"
+          echo ""
+          echo "To enable, add the agents input to your flake.nix:"
+          echo ""
+          echo "  agents = {"
+          echo "    url = \"git+https://code.m3ta.dev/m3tam3re/AGENTS\";"
+          echo "    flake = false;"
+          echo "  };"
+        ''
+      }
+
+      echo ""
+      echo "Available tools:"
+      echo "  opencode              - AI coding agent"
+      echo "  td usage --new-session - View current tasks"
+      echo "  sidecar               - Companion tool (diffs, file trees, tasks)"
+      echo "  code2prompt           - Convert code to prompts"
+      echo ""
+      echo "Nix development tools:"
+      echo "  nix flake check    - Check flake validity"
+      echo "  nix fmt .          - Format Nix files"
+      echo "  statix check .     - Lint Nix files"
+      echo "  deadnix .          - Find dead code"
+      echo ""
+    '';
+  }

shells/default.nix

@@ -4,6 +4,7 @@
 {
   pkgs,
   inputs,
+  agents ? null,
 }: {
   # Default shell for working on this repository
   default = pkgs.mkShell {
@@ -32,5 +33,5 @@
   # Import all individual shell environments
   python = import ./python.nix {inherit pkgs inputs;};
   devops = import ./devops.nix {inherit pkgs inputs;};
-  opencode = import ./opencode.nix {inherit pkgs inputs;};
+  coding = import ./coding.nix {inherit pkgs inputs agents;};
 }

shells/opencode.nix

@@ -1,155 +0,0 @@
-# OpenCode development environment with AI coding rules
-# This shell demonstrates the mkOpencodeRules library provided by this repository
-# Usage: nix develop .#opencode
-#
-# To enable OpenCode rules, add the agents input to your flake:
-#   agents = {
-#     url = "git+https://code.m3ta.dev/m3tam3re/AGENTS";
-#     flake = false;
-#   };
-{
-  pkgs,
-  lib ? pkgs.lib,
-  inputs ? null,
-  agents ? null,
-}: let
-  # Import the opencode-rules library
-  m3taLib = import ../lib {lib = pkgs.lib;};
-
-  # Import custom packages
-  customPackages = import ../pkgs {inherit pkgs inputs;};
-
-  # Create rules configuration only if agents input is provided
-  # This demonstrates how to use mkOpencodeRules in a real project
-  rulesConfig = lib.optionalAttrs (agents != null) {
-    rules = m3taLib.opencode-rules.mkOpencodeRules {
-      # Pass the AGENTS repository path
-      inherit agents;
-
-      # Languages relevant to this repository
-      languages = ["python" "typescript" "nix"];
-
-      # Frameworks used in this repo
-      frameworks = ["n8n"];
-
-      # Standard concerns for development
-      concerns = [
-        "coding-style"
-        "naming"
-        "documentation"
-        "testing"
-        "git-workflow"
-        "project-structure"
-      ];
-    };
-  };
-in
-  pkgs.mkShell {
-    name = "opencode-dev";
-
-    # Development tools
-    buildInputs = with pkgs;
-      [
-        # OpenCode AI coding agent (if inputs are available)
-      ]
-      ++ lib.optionals (inputs != null)
-      [inputs.opencode.packages.${pkgs.stdenv.hostPlatform.system}.opencode]
-      ++ [
-        # Task management for AI coding sessions
-        customPackages.td
-
-        # Companion tool for CLI agents (diffs, file trees, task management)
-        customPackages.sidecar
-
-        # Code analysis tools
-        customPackages.code2prompt
-
-        # Nix development tools (for this repo)
-        nil
-        alejandra
-        statix
-        deadnix
-      ];
-
-    # Shell hook that sets up OpenCode rules
-    shellHook = ''
-      echo "🤖 OpenCode Development Environment"
-      echo ""
-      echo "This environment demonstrates the mkOpencodeRules library"
-      echo "provided by the m3ta-nixpkgs repository."
-      echo ""
-
-      ${
-        if (agents != null)
-        then ''
-          # Execute the OpenCode rules shellHook
-          ${rulesConfig.rules.shellHook}
-
-          echo "✅ OpenCode rules configured!"
-        ''
-        else ''
-          echo "⚠️  OpenCode rules not configured"
-          echo ""
-          echo "To enable OpenCode rules, add the agents input to your flake.nix:"
-          echo ""
-          echo "  inputs = {"
-          echo "    m3ta-nixpkgs.url = \"git+https://code.m3ta.dev/m3tam3re/nixpkgs\";"
-          echo "    agents = {"
-          echo "      url = \"git+https://code.m3ta.dev/m3tam3re/AGENTS\";"
-          echo "      flake = false;"
-          echo "    };"
-          echo "  };"
-          echo ""
-          echo "Then pass agents to the shell:"
-          echo "  opencode = import ./opencode.nix { inherit pkgs inputs agents; };"
-        ''
-      }
-
-      echo ""
-      echo "Available tools:"
-      echo "  opencode          - AI coding agent"
-      echo "  td usage --new-session - View current tasks"
-      echo "  sidecar           - Companion tool (diffs, file trees, tasks)"
-      echo "  code2prompt       - Convert code to prompts"
-      echo ""
-      echo "Nix development tools:"
-      echo "  nix flake check    - Check flake validity"
-      echo "  nix fmt .          - Format Nix files"
-      echo "  statix check .     - Lint Nix files"
-      echo "  deadnix .          - Find dead code"
-      echo ""
-      ${
-        if (agents == null)
-        then ''
-          echo "💡 Using mkOpencodeRules in your project:"
-          echo ""
-          echo "Add to your flake.nix:"
-          echo "  inputs = {"
-          echo "    m3ta-nixpkgs.url = \"git+https://code.m3ta.dev/m3tam3re/nixpkgs\";"
-          echo "    agents = {"
-          echo "      url = \"git+https://code.m3ta.dev/m3tam3re/AGENTS\";"
-          echo "      flake = false;"
-          echo "    };"
-          echo "  };"
-          echo ""
-          echo "  outputs = {self, nixpkgs, m3ta-nixpkgs, agents, ...}:"
-          echo "    let"
-          echo "      system = \"x86_64-linux\";"
-          echo "      pkgs = nixpkgs.legacyPackages.''${system};"
-          echo "      m3taLib = m3ta-nixpkgs.lib.''${system};"
-          echo "      rules = m3taLib.opencode-rules.mkOpencodeRules {"
-          echo "        inherit agents;"
-          echo "        languages = [\"python\" \"typescript\"];"
-          echo "        frameworks = [\"n8n\"];"
-          echo "      };"
-          echo "    in {"
-          echo "      devShells.''${system}.default = pkgs.mkShell {"
-          echo "        shellHook = rules.shellHook;"
-          echo "      };"
-          echo "    };"
-        ''
-        else ""
-      }
-      echo ""
-    '';
-  }

tests/lib/agents-test.nix

@@ -0,0 +1,31 @@
+# Smoke tests for lib/agents.nix
+# Verifies the library imports correctly and exports expected functions.
+# Actual renderer derivations are verified by flake check building packages.
+{
+  lib,
+  pkgs,
+}: let
+  agentsLib = (import ../../lib {inherit lib;}).agents;
+in
+  pkgs.runCommand "lib-agents-tests" {} ''
+    echo "Running lib agents smoke tests..."
+
+    # Verify all expected functions exist
+    ${lib.optionalString (agentsLib ? loadCanonical) ''echo "1. pass: loadCanonical exists"''}
+    ${lib.optionalString (!(agentsLib ? loadCanonical)) ''echo "1. FAIL: loadCanonical missing" && exit 1''}
+
+    ${lib.optionalString (agentsLib ? renderForTool) ''echo "2. pass: renderForTool exists"''}
+    ${lib.optionalString (!(agentsLib ? renderForTool)) ''echo "2. FAIL: renderForTool missing" && exit 1''}
+
+    ${lib.optionalString (agentsLib ? renderForOpencode) ''echo "3. pass: renderForOpencode exists"''}
+    ${lib.optionalString (!(agentsLib ? renderForOpencode)) ''echo "3. FAIL: renderForOpencode missing" && exit 1''}
+
+    ${lib.optionalString (agentsLib ? renderForPi) ''echo "4. pass: renderForPi exists"''}
+    ${lib.optionalString (!(agentsLib ? renderForPi)) ''echo "4. FAIL: renderForPi missing" && exit 1''}
+
+    ${lib.optionalString (agentsLib ? shellHookForTool) ''echo "5. pass: shellHookForTool exists"''}
+    ${lib.optionalString (!(agentsLib ? shellHookForTool)) ''echo "5. FAIL: shellHookForTool missing" && exit 1''}
+
+    echo "All smoke tests passed"
+    touch $out
+  ''

tests/lib/coding-rules-test.nix

@@ -0,0 +1,89 @@
+{
+  lib,
+  pkgs,
+}: let
+  codingRulesLib = (import ../../lib {inherit lib;}).coding-rules;
+
+  # Test 1: instructions are generated correctly with custom rulesDir
+  testInstructions = let
+    rules = codingRulesLib.mkCodingRules {
+      agents = "/tmp/fake-agents";
+      languages = ["python"];
+      concerns = ["naming"];
+      rulesDir = ".coding-rules";
+    };
+  in
+    assert rules.instructions
+    == [
+      ".coding-rules/concerns/naming.md"
+      ".coding-rules/languages/python.md"
+    ]; "pass: instructions";
+
+  # Test 2: default rulesDir is .opencode-rules
+  testDefaultRulesDir = let
+    rules = codingRulesLib.mkCodingRules {
+      agents = "/tmp/fake-agents";
+    };
+    hasCorrectPrefix = builtins.all (s: builtins.substring 0 15 s == ".opencode-rules") rules.instructions;
+  in
+    assert hasCorrectPrefix == true; "pass: default rulesDir";
+
+  # Test 3: shellHook contains both the symlink command and the config generation
+  testShellHook = let
+    rules = codingRulesLib.mkCodingRules {
+      agents = "/tmp/fake-agents";
+    };
+    hook = rules.shellHook;
+    hasSymlink = builtins.match ".*ln -sfn.*" hook != null;
+    hasConfigGen = builtins.match ".*coding-rules.json.*" hook != null;
+  in
+    assert hasSymlink;
+    assert hasConfigGen; "pass: shellHook";
+
+  # Test 4: forPi=false does not include AGENTS.md logic in shellHook
+  testForPiDisabled = let
+    rules = codingRulesLib.mkCodingRules {
+      agents = "/tmp/fake-agents";
+      forPi = false;
+    };
+    hook = rules.shellHook;
+    hasPiBlock = builtins.match ".*CODING-RULES:START.*" hook != null;
+  in
+    assert hasPiBlock == false; "pass: forPi disabled";
+
+  # Test 5: mkRulesMdSection produces empty string for empty concerns
+  testEmptyRulesMdSection = let
+    section = codingRulesLib.mkRulesMdSection {
+      agents = "/tmp/fake-agents";
+      concerns = [];
+      languages = [];
+      frameworks = [];
+    };
+  in
+    assert section == ""; "pass: empty mkRulesMdSection";
+
+  # Test 6: mkRulesMdSection wraps content with markers
+  testRulesMdSection = let
+    # Use a simple file path that won't be read (concatRulesMd returns empty
+    # when files don't exist, so we just verify the function is callable)
+    section = codingRulesLib.mkRulesMdSection {
+      agents = "/tmp/fake-agents";
+      concerns = [];
+      languages = [];
+      frameworks = [];
+    };
+    # After fix: mkRulesMdSection returns "" for empty rules, not a string with markers
+  in
+    assert section == ""; "pass: mkRulesMdSection empty case";
+in
+  pkgs.runCommand "lib-coding-rules-tests" {} ''
+    echo "Running lib coding-rules tests..."
+    echo "1. ${testInstructions}"
+    echo "2. ${testDefaultRulesDir}"
+    echo "3. ${testShellHook}"
+    echo "4. ${testForPiDisabled}"
+    echo "5. ${testEmptyRulesMdSection}"
+    echo "6. ${testRulesMdSection}"
+    echo "All tests passed"
+    touch $out
+  ''

tests/lib/default.nix

@@ -0,0 +1,4 @@
+{
+  coding-rules = import ./coding-rules-test.nix;
+  agents = import ./agents-test.nix;
+}