Bugfix Opus — Testing & QA agent for Claude Code
Use proactively when a bug is reported with enough to reproduce it ("it is broken", "returns X instead of Y", a failing test).
How to install Bugfix Opus
Installs to ~/.claude/agents/yacb2-aidex-bugfix-opus.md
mkdir -p ~/.claude/agents && curl -fsSL https://raw.githubusercontent.com/yacb2/aidex/HEAD/agents/bugfix-opus.md -o ~/.claude/agents/yacb2-aidex-bugfix-opus.md Restart Claude Code, or start a new session, for it to be picked up.
What Bugfix Opus does
name: bugfix-opus description: Use proactively when a bug is reported with enough to reproduce it ("it is broken", "returns X instead of Y", a failing test). Handoff: five sections - worktree and command rules, the symptom and reproduction, files to read first, the test command, what to return. Writes the regression test first (RED for the right reason), then the minimum fix (GREEN), and returns both proof lines. Never commits; the main session reviews the diff and commits test and fix toget
Alternatives in Testing & QA
- Civitai Test Review — Reviews the tests in a feature segment of the main Civitai Next.js app (src/) for whether they would actually 7.2k ★
- Extension Smoke Test — Pre-reload smoke test for the WXT browser extension 189 ★
- Fixer Opus — Fix-only agent, tier 3. Diagnoses unknown-cause findings (reproduce, then fix) with a regression test, then co 77 ★
Full documentation available on GitHub
View Source RepositoryRelated Agents
Impl Sonnet
Use proactively when what to build is already decided and it has a test or gate: a plan phase, a backlog item,
Swift Debugger
Root-cause analysis for Swift/iOS failures — compiler errors, test failures, crashes, data races, SwiftUI view
Runner
Test-suite execution on Opus 5. Use to run pytest, vitest, or the e2e suite and get back a digest of failures
Shadowcat Spec Reviewer Opus
Escalation twin of shadowcat-spec-reviewer — dispatch when shadowcat-spec-reviewer's findings read as shallow
Npl PRD Editor
Transforms user stories and feature requests into well-structured PRD documents under project-management/PRDs/
Auto Fixer.Agent
Use when there is a failing test, error log, CI failure, review finding, production symptom, or other concrete
Related Skills
Find Bug
Investigate a reported symptom, form hypotheses, and locate the root cause.
Hatch3r Bug Plan
Diagnose a complex incident -- reproduce the symptom, rank root-cause hypotheses, design the fix path, and emi
Reproduce
Prompt — reproduce a bug as a failing test