{
  lib,
  stdenv,
  fetchFromGitHub,
  python3,
}:
# NOTE: First build will fail with a hash mismatch error.
# Copy the "got: sha256-XXX..." from the error and replace fakeHash below.
let
  version = "3.0.6";

  src = fetchFromGitHub {
    owner = "plastic-labs";
    repo = "honcho";
    tag = "v${version}";
    hash = lib.fakeHash;
  };

  pythonEnv = python3.withPackages (ps:
    with ps; [
      # Core web framework
      fastapi
      uvicorn
      httptools
      python-dotenv
      sqlalchemy
      fastapi-pagination

      # Database & vector
      pgvector
      psycopg
      greenlet

      # LLM providers
      openai
      google-genai

      # Utilities
      httpx
      rich
      nanoid
      alembic
      pyjwt
      tenacity
      tiktoken
      langfuse
      pydantic
      pydantic-settings
      pdfplumber
      typing-extensions
      json-repair
      scikit-learn
      prometheus-client
      cloudevents

      # Vector store backends
      turbopuffer
      lancedb
      pyarrow

      # Cache
      redis
      cashews

      # Observability
      sentry-sdk
    ]);
in
  stdenv.mkDerivation {
    pname = "honcho";
    inherit version src;

    buildInputs = [pythonEnv];

    buildPhase = ''
      rm -rf sdks honcho-cli
    '';

    installPhase = ''
      mkdir -p $out/{src,migrations,scripts,bin}

      cp -r src/* $out/src/
      cp -r migrations/* $out/migrations/
      cp scripts/provision_db.py $out/scripts/
      cp alembic.ini $out/

      # API wrapper
      cat > $out/bin/honcho-api << 'WRAPPER'
      #!/bin/sh
      exec ${pythonEnv}/bin/python -c "
      import sys, os
      app_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
      os.chdir(app_dir)
      sys.path.insert(0, app_dir)
      os.environ.setdefault('PYTHON_DOTENV_DISABLED', 'true')
      os.environ.setdefault('HONCHO_CONFIG_TOML_DISABLED', 'true')
      import uvicorn
      port = int(os.environ.get('PORT', '8000'))
      for i, arg in enumerate(sys.argv[1:]):
          if arg.startswith('--port='):
              port = int(arg.split('=',1)[1])
          elif arg == '--port':
              nxt = sys.argv[i+2:i+3]
              if nxt: port = int(nxt[0])
      uvicorn.run('src.main:app', host='0.0.0.0', port=port)
      " "$@"
      WRAPPER
      chmod +x $out/bin/honcho-api

      # Deriver wrapper
      cat > $out/bin/honcho-deriver << 'WRAPPER'
      #!/bin/sh
      exec ${pythonEnv}/bin/python -c "
      import sys, os
      app_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
      os.chdir(app_dir)
      sys.path.insert(0, app_dir)
      os.environ.setdefault('PYTHON_DOTENV_DISABLED', 'true')
      os.environ.setdefault('HONCHO_CONFIG_TOML_DISABLED', 'true')
      from src.deriver.__main__ import *
      " "$@"
      WRAPPER
      chmod +x $out/bin/honcho-deriver

      # Migration wrapper
      cat > $out/bin/honcho-migrate << 'WRAPPER'
      #!/bin/sh
      exec ${pythonEnv}/bin/python -c "
      import sys, os, asyncio
      app_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
      os.chdir(app_dir)
      sys.path.insert(0, app_dir)
      os.environ.setdefault('PYTHON_DOTENV_DISABLED', 'true')
      os.environ.setdefault('HONCHO_CONFIG_TOML_DISABLED', 'true')
      from src.db import init_db
      asyncio.run(init_db())
      " "$@"
      WRAPPER
      chmod +x $out/bin/honcho-migrate
    '';

    passthru = {
      inherit pythonEnv;
      python = pythonEnv;
    };

    meta = {
      description = "Honcho — Memory system for stateful AI agents";
      homepage = "https://honcho.dev";
      license = lib.licenses.agpl3Only;
      platforms = lib.platforms.linux;
    };
  }