/fix

description: Fix a confirmed bug: a failing regression test first, then a minimal fix, then the rest of the tdd gates.
argument-hint: "<what's happening vs. what should happen>"

{{CMD:fix}} — regression-first bug fix

The only permitted entry to bug-fix work. No fix code is written before a regression test reproduces the defect and goes red for the right reason. Give the observed behavior and the expected behavior, plus a stack trace or reproduction when you have one.

**Orientation:** if `.codearbiter/code-map.md` is present, read it before diagnosing — a coarse concern→path→role map that helps locate the defect. Absent is fine; it is read-on-demand.

Flow

Routes to the `tdd` skill, bug variant — Phase 1 is framed around confirming the defect, not building new behavior:

1. **Reproduce** the bug consistently. 2. **Locate the root cause** — the exact code path producing the wrong behavior. 3. **Write a regression test** that fails in the current state for the precise reason the bug causes (not an unrelated error). 4. **Confirm it's red for the right reason** — the failure message matches the described defect.

Only then does `tdd` proceed: minimal fix to green, then the remaining `tdd` gates. The implementation agent (`backend-author`, `frontend-author`, or `infra-author`) is selected by where the bug lives. If the defect cannot be pinned by a failing test, STOP and surface the question.

Routes to

`tdd` (`{{PLUGIN_ROOT}}/skills/tdd/SKILL.md`) — all phases, Phase 1 framed for bug confirmation.

When NOT to use

• New behavior → `{{CMD:feature}}`.
• A behavior-preserving restructure → `{{CMD:refactor}}`.
• "Why does it do this?" → `{{CMD:btw}}`.
• Persisting fix code already written → `{{CMD:commit}}` (the gates still apply).

Hard gate

MUST NOT write fix code before the regression test is red for the right reason. MUST NOT accept a test that passes against the broken state as proof of the defect.