| name | verify-no-regressions |
| argument-hint | [count] [base-branch] |
| description | Verify no behavioral regressions after implementation. Spawns parallel sonnet subagents for semantic diff review + test execution. Use when: user says "verify no regressions", "check for regressions", "make sure nothing broke".
|
Verify No Regressions
Usage: /verify-no-regressions [count] [base-branch] (defaults: 1 main)
Work state
- Working tree: !
git status --short 2>/dev/null || echo "(not a git repo)"
- Commits ahead of base: !
set -- $ARGUMENTS; git log --oneline "${2:-main}"...HEAD 2>/dev/null || echo "(none or invalid base)"
- Committed diff: !
set -- $ARGUMENTS; git diff --stat "${2:-main}"...HEAD 2>/dev/null
- Staged diff: !
git diff --cached --stat 2>/dev/null
- Unstaged diff: !
git diff --stat 2>/dev/null
- Test scripts: !
cat package.json 2>/dev/null | jq -r '.scripts | to_entries[] | select(.key | test("test";"i")) | "\(.key): \(.value)"' 2>/dev/null || echo "(no package.json)"
Instructions
Read the work state above to determine what happened:
- Committed: commits ahead of base, clean working tree → review with
git diff base...HEAD
- Staged: files in staging → review with
git diff --cached
- Unstaged/untracked: modified or new files → review working tree files directly
- Mixed: combination of the above → review all layers
If nothing changed anywhere, report that and stop.
Spawn sonnet subagents in a single message. Tell each agent which diff commands to use based on the work state.
-
Semantic reviewers -- split changed files across $0 agent(s) (default: 1). Each agent:
- Reads the diff (using the appropriate command for the work state) and current file contents
- Classifies each change as INTENTIONAL, RISKY (could break callers), or REGRESSION
- Reports verdict: PASS / NEEDS_REVIEW / FAIL
-
Test runner (skip if no test infrastructure) -- one additional agent that runs the test suite and reports PASS / FAIL.
After all agents complete, synthesize a single report with overall verdict.
