Toolchain Health (Python + mise + Poetry)

Navigate and validate the Python toolchain configuration for this repo.

Canonical Policy

• Exact version source of truth: .mise.toml
  • Example:

    [tools]
    python = "3.11.8"
    

• Compatible range in pyproject.toml:
  • Use a range that includes the mise version and allows patch bumps, e.g.:

    [tool.poetry.dependencies]
    python = ">=3.11,<4.0"
    

• Poetry env uses the mise-managed interpreter:
  • When (re)creating the env:

    poetry env use "$(mise which python)"
    poetry lock
    poetry install --only main
    

• Upgrades:
  1. Update .mise.toml first and run mise install python.
  2. Run poetry env use "$(mise which python)".
  3. Only then tighten the python range in pyproject.toml if necessary.

Agents should avoid changing one layer (mise or pyproject) without considering the others.

Command: /toolchain-health

Use the /toolchain-health command (see .claude/commands/toolchain-health.md) to:

1. Print Python from mise (mise which python + version).
2. Show the python = ... constraint in pyproject.toml.
3. Show the Python used by the Poetry env (if any).

When to Use This Skill

• Editing .mise.toml to change Python versions.
• Editing pyproject.toml to change the python constraint.
• Seeing Poetry errors like:
  • "Current Python version is not allowed by the project"
  • Version solver failures related to python markers.
• Before running poetry lock or poetry install as part of dependency or LLM infra work.

Agent Guidance

When this skill is relevant:

1. Run /toolchain-health to gather the current state.
2. Identify mismatches:
   • If .mise.toml and pyproject.toml disagree, recommend updating one to match the other, following the policy above.
   • If Poetry env uses a different interpreter than mise, recommend:

     poetry env use "$(mise which python)"
     

3. Explain the root cause and suggest a minimal, coherent fix rather than ad-hoc changes.