review-coverage

name	review-coverage
description	Assess whether a pull request's review comments address the generated checklist items. Reads the checklist from PR comments and local files, maps review comments to checklist items, and reports coverage.
allowed-tools	Read, Bash(gh *), Bash(git *), Bash(ls *), Bash(bash plugins/*), Bash(wc *)
user-invocable	true

Review Coverage --- Checklist Completeness Assessment

Assess whether a PR's review comments and checklist state address all generated checklist items. Reports coverage percentage and identifies uncovered items.

Command

/review-coverage <pr-number>

Arguments

Argument	Required	Description
<pr-number>	Yes	The GitHub PR number to assess coverage for.

Prerequisites

• gh CLI must be installed and authenticated
• A review checklist must have been previously generated for the PR (via /review-checklist)

Workflow

1. Verify prerequisites. Check that gh is available and authenticated:

   bash scripts/check-gh-cli.sh
   

2. Locate the checklist. Find the review checklist using the dual storage model (ADR-012):

   • Primary: Search PR comments for the marker <!-- principled-review-checklist: PR-<number> -->

     gh pr view <pr-number> --json comments --jq '.comments[].body'
     

   • Fallback: Check for .review/<pr-number>-checklist.md locally

   If no checklist is found, report the absence and suggest running /review-checklist first.

3. Parse checklist state. From the located checklist, extract all items and their checked/unchecked state:

   • - [x] = checked (addressed)
   • - [ ] = unchecked (not addressed)
   • Group by section: Acceptance Criteria, ADR Compliance, General Quality

4. Retrieve review comments. Get all review comments on the PR:

   gh pr view <pr-number> --json reviews,comments
   

   Also fetch inline review comments (file-level comments):

   gh api repos/{owner}/{repo}/pulls/<pr-number>/comments
   

5. Map comments to checklist items. For each unchecked checklist item, search review comments for relevant discussion:

   • Match by keyword overlap between the checklist item text and comment content
   • Match by file association (inline comments on files related to specific criteria)
   • A comment is considered to "address" a checklist item if it discusses the same concern, even without checking the box

6. Calculate coverage. Compute coverage metrics:

   • Checked coverage: percentage of checklist items marked [x]
   • Discussed coverage: percentage of items either checked or addressed by comments
   • Per-section breakdown

7. Report results. Output a structured coverage report:

   Review Coverage for PR #42:
   
   Overall: 10/14 items addressed (71%)
     Checked: 8/14 (57%)
     Discussed but unchecked: 2/14 (14%)
   
   By section:
     Acceptance Criteria:  4/5 addressed (80%)
       - [ ] Widget renders correctly with default props  ← NOT ADDRESSED
     ADR Compliance:       3/3 addressed (100%)
     General Quality:      3/6 addressed (50%)
       - [ ] Documentation updated if public API changed  ← NOT ADDRESSED
       - [ ] No TODO/FIXME comments without linked issues  ← NOT ADDRESSED
       - [ ] Error handling for external calls             ← NOT ADDRESSED
   
   Recommendation: 4 items remain unaddressed. Consider reviewing
   before approving.
   

Important Notes

• /review-coverage is read-only. It does not modify the checklist, the PR, or any plan documents.
• Coverage is advisory. The plugin reports gaps but does not gate merges.
• Comment-to-item mapping is best-effort. Free-text comments may not map cleanly to structured checklist items. When in doubt, items are reported as unaddressed.

Scripts

• scripts/check-gh-cli.sh --- Verify gh CLI availability and auth status (copy from principled-github canonical)