clist: Skill for Claude Code

Run & verify CLIST changes

The long-running dev service hosts Django and RQ. Use it for Django tests and management commands; run standalone script tests on the host. See docs/testing.md for fixtures, CI coverage, and legacy PHP tests.

Choose checks by changed behavior

• Django app code: start with a focused test label, then widen only if the change affects more code:

  docker compose exec dev ./manage.py test --keepdb ranking.tests.test_parser_regression
  

• Parser output: run an existing offline fixture via ./manage.py test --keepdb ranking.tests.test_parsers. Fixture recording makes live requests. parse_statistic --no-update-results can still write contest problems and event logs, so it is not a read-only test.
• Operational Python scripts: run the relevant src/scripts/tests/ test with host pytest. The full standalone command and its pinned dependencies are in docs/testing.md.
• Management commands without a focused test: inspect --help and choose a narrow invocation whose side effects are understood. A flag named --dryrun is safe only if its implementation actually avoids writes.

Run Ruff on changed Python files from the host:

mise exec -- ruff check src/path/changed.py
mise exec -- ruff format --check src/path/changed.py

Use ruff format without --check only when intending to change formatting. Report the exact checks, results, and any behavior they did not cover. When a check fails, investigate the cause before widening or repeating it.