{
  config,
  lib,
  pkgs,
  ...
}: let
  shared = import ./shared-options.nix {inherit lib;};
in
  with lib; {
    options.coding.agents.opencode = {
      enable = mkEnableOption "OpenCode agent management via canonical agent.toml definitions";

      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;

      externalSkills = shared.externalSkillsOption;
    };

    config = mkIf config.coding.agents.opencode.enable {
      # Rendered agent files symlinked to ~/.config/opencode/agents/
      xdg.configFile."opencode/agents" = let
        cfg = config.coding.agents.opencode;
      in
        mkIf (cfg.agentsInput != null) {
          source = (import ../../../../lib {inherit lib;}).agents.renderForOpencode {
            inherit pkgs;
            canonical = cfg.agentsInput.lib.loadAgents;
            modelOverrides = cfg.modelOverrides;
          };
        };

      # Skills (merged from personal AGENTS repo + optional external skills)
      xdg.configFile."opencode/skills" = let
        cfg = config.coding.agents.opencode;
      in
        mkIf (cfg.agentsInput != null) {
          source = cfg.agentsInput.lib.mkOpencodeSkills {
            inherit pkgs;
            customSkills = "${cfg.agentsInput}/skills";
            externalSkills = shared.mapExternalSkills cfg.externalSkills;
          };
        };

      # Static config dirs from AGENTS repo
      xdg.configFile."opencode/context" = let
        cfg = config.coding.agents.opencode;
      in
        mkIf (cfg.agentsInput != null) {
          source = "${cfg.agentsInput}/context";
        };
      xdg.configFile."opencode/commands" = let
        cfg = config.coding.agents.opencode;
      in
        mkIf (cfg.agentsInput != null) {
          source = "${cfg.agentsInput}/commands";
        };
      xdg.configFile."opencode/prompts" = let
        cfg = config.coding.agents.opencode;
      in
        mkIf (cfg.agentsInput != null) {
          source = "${cfg.agentsInput}/prompts";
        };
    };
  }