The implementer + reviewer sandcastle prompts already enforce
conventional commits, but the convention was buried in those prompt
templates — agents not running through sandcastle (e.g. interactive
Claude sessions, ad-hoc fixups) had no visible signal that the format
is non-negotiable.
Four visibility surfaces now carry the signal:
- CLAUDE.md Key Conventions: new top bullet stating the spec
(<type>(<scope>): <subject>), the full type list, breaking-change
syntax (!), and three example commits
- AGENTS.md preamble: parallel callout alongside the vocabulary
and quality-gates notes
- .claude/hooks/session-start.sh: one-line reminder in the boot
pointers (every session now sees it at start)
- .claude/hooks/prompt-context.sh: new 10th keyword group fires
when a user prompt mentions commit/message/changelog/conventional,
injecting the full spec into the turn's context
Conventional Commits spec: https://www.conventionalcommits.org/
Verified: the prompt-context hook smoke-tests green when a prompt
containing "commit message" is piped in — it emits the conventional
commits pointer.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Danijel Martinek
7193acd1d1