{
  "instruction": "Separate production and dev/test dependencies using optional-dependencies in pyproject.toml",
  "relevant_when": "Agent creates a Python project with both production and development dependencies",
  "context": "Production dependencies go in [project.dependencies]. Development tools (ruff, mypy, pre-commit) and test dependencies (pytest, httpx, coverage) go in [project.optional-dependencies] under dev and/or test groups. This prevents dev tools from being installed in production.",
  "sources": [
    {
      "type": "file",
      "filename": "skills/python-project-structure/SKILL.md",
      "tile": "tessl-labs/python-project-structure@0.2.0"
    }
  ],
  "checklist": [
    {
      "name": "optional-dependencies-exist",
      "rule": "pyproject.toml has [project.optional-dependencies] with at least a dev or test group containing development/testing tools",
      "relevant_when": "Agent creates a Python project with pytest, ruff, or other dev tools"
    },
    {
      "name": "test-deps-separated",
      "rule": "pytest and test-related packages (httpx, pytest-cov, pytest-asyncio) are in optional-dependencies, not in the main dependencies list",
      "relevant_when": "Agent creates a Python project with tests"
    }
  ]
}