Commit Message

Commit Message Skill

Generate a single conventional commit message from staged Git changes or a provided commit-context artifact.

Inputs

• Staged Git changes are the primary source of truth.
• Accept a commit-context artifact file when explicitly provided.
• Ignore unstaged changes unless included in the provided context.
• If no staged changes and no context artifact exist, stop and report that there is no in-scope commit content.

Context Gathering

1. Use the supplied commit-context artifact first when present.
2. When the drm-copilot MCP commit-context tool is available for the workflow, collect commit context through that tool and stop if the MCP call fails.
3. Otherwise inspect read-only staged Git state only:
   • git diff --cached --stat
   • git diff --cached
   • git diff --cached --name-only
   • git log --oneline -n 20
4. Do not infer intent from unstaged files or unrelated commit history.

Classification

Follow Conventional Commits semantics. Choose exactly one primary type from: feat, fix, docs, test, refactor, ci, chore.

• Use the dominant intent of the staged changes.
• Prefer docs, test, or fix over chore when classification is ambiguous.
• Add a scope only when it materially improves clarity. Keep scopes concrete and subsystem-oriented.

Message Format

Output exactly one fenced code block with language tag text containing the commit message:

type(optional-scope): concise imperative summary

- Bullet describing meaningful change #1
- Bullet describing meaningful change #2

Refs: #<issue>

Header rules: imperative mood, 72 characters or fewer, no trailing period, no filler words.

Body rules: use bullets only when they add signal beyond the header. Avoid implementation trivia.

Reference rules: include Refs: footer only when issue or PR references are present in the context. Do not invent references.

Prohibitions

• No emojis
• No commentary outside the fenced code block
• No Markdown inside the commit body beyond plain-text hyphen bullets
• No references to "this commit"
• No speculation about unstaged work
• No multiple alternative commit messages