fix-issue

name	fix-issue
description	Take a GitHub issue from number to tested fix — read the issue and comments, reproduce, locate the cause, fix with a regression test, and prep a PR that closes it.
argument-hint	[issue number or URL]
disable-model-invocation	true
allowed-tools	["Bash(gh issue view *)","Bash(gh issue list *)","Bash(git status)","Bash(git diff *)","Bash(git log *)","Bash(git checkout *)","Bash(git branch *)"]

Work a GitHub issue end to end. $ARGUMENTS is the issue number or URL; if omitted, run gh issue list --assignee @me --state open and ask which one.

Step 1: Understand the issue

• gh issue view $NUMBER --comments — read the body AND the discussion; the real spec is often in comment 7.
• Extract: expected behavior, actual behavior, reproduction steps, acceptance criteria, and any decisions already made in the thread.
• If the issue is ambiguous on something that changes the fix (which behavior is correct? which platform?), ask the user — do NOT guess and do NOT ask in the issue thread without being told to.

Step 2: Classify and branch

• Bug → follow /debug-fix discipline: reproduce it first (failing test or manual repro), then investigate. No fix before reproduction.
• Small feature / chore → follow /tdd discipline if a test runner exists: failing test, minimum code, refactor.
• Propose a branch named fix/issue-$NUMBER-<slug> (or feat/...), matching any existing convention visible in git branch -a. Confirm before creating.

Step 3: Locate and fix

• Find the code path from the symptoms: grep for the error message, the feature's entry point, or names from the issue.
• Make the smallest change that satisfies the acceptance criteria. Resist adjacent refactoring — note it for a follow-up instead.
• Every bug fix ships with a regression test that fails on the old code. If you can't write one, say why in the PR body.

Step 4: Verify against the issue

• Re-run the reproduction from Step 1 — confirm the reported behavior is gone.
• Run the tests for the touched area, then lint/typecheck.
• Walk the acceptance criteria one by one; quote each with its status.

Step 5: Ship it

• Hand off to /ship (or follow its discipline): commit message and PR body must include Fixes #$NUMBER so the merge auto-closes the issue.
• PR body: one-line cause, one-line fix, the regression test, and anything from the issue thread that influenced the approach.
• After the PR exists, offer to comment the PR link on the issue (gh issue comment — requires confirmation; it's outward-facing).

Rules

• Never start coding before Step 1 is complete — the thread often contains a decision that invalidates the obvious fix.
• One issue per branch per PR. If the issue is really three issues, say so and fix the one that was asked.
• If reproduction is impossible (can't access the environment, missing credentials), report exactly what's missing instead of fixing blind.