Appendix B — Appendix: The Slop Defence Kit

The five gates from Chapter 9, as a starting configuration. Tune the thresholds; never remove a gate silently.

Gate	Tool	Starting threshold
Style and errors	ruff check	any error fails
Behaviour	pytest	any failure fails
Coverage floor	pytest --cov-fail-under	80%
Forgotten promises	TODO/FIXME grep	more than 5 fails
Change-size budget	git diff main --stat	more than 400 lines fails

B.1 Commissioning prompt

Build slop_check.py implementing the five gates above as one script,
per the specification in this conversation. Under 100 lines,
standard library plus ruff and pytest only.

B.2 Wiring

• Local: pre-commit hook running python slop_check.py.
• Remote: the same five gates as a CI workflow. Commission the YAML from the agent, then verify it by opening a branch pull request.