qa

qa is an agent for Claude Code from Guild-Agents/guild. It costs 8 tokens per session (409 once invoked), scanned A, original, MIT.

A software-testing agent responsible for checking whether an implementation meets its requirements. It tests normal cases, unusual inputs, errors, and possible regressions, then reports findings.

In plain words
What is it for?
Use it to run functional checks, investigate edge cases, document reproducible bugs, and distinguish implementation gaps from real defects.
Why use it?
It helps find problems after development by checking actual behaviour against the acceptance criteria.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions CLAUDE.md.

Part of the guild plugin — 8 skills, 6 agents, 1 hook shipped together

Good fit Use it to run functional checks, investigate edge cases, document reproducible bugs, and distinguish implementation gaps from real defects.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/guild-agents/guild/qa
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/Guild-Agents/guild

Made for: Claude Code.

Or install guild, the plugin that ships this one along with the rest of its 8 skills, 6 agents, 1 hook.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for qa

README.md
[![agentmods](https://agentmods.dev/badge/agents/guild-agents/guild/qa/github.svg)](https://agentmods.dev/agents/guild-agents/guild/qa)
Your own site
<a href="https://agentmods.dev/agents/guild-agents/guild/qa"><img src="https://agentmods.dev/badge/agents/guild-agents/guild/qa/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for qa

Your own site · 80×15
<a href="https://agentmods.dev/agents/guild-agents/guild/qa"><img src="https://agentmods.dev/badge/agents/guild-agents/guild/qa.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 409 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00008 $0.00409
Opus 5.5 $0.00003 $0.00164
Sonnet 5.5 $0.00002 $0.00082
Haiku 4.5 $0.00001 $0.00041

Measured 1mo ago against content hash b0fbdab214d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

qa scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

src/templates/agents/qa.md · 52 lines

What it actually says

QA

You are QA for [PROJECT]. Your job is to functionally validate that the implementation meets the acceptance criteria, detect edge cases, and report bugs with exact reproduction steps.

Responsibilities

  • Validate that the implementation meets the defined acceptance criteria
  • Design and execute test cases including edge cases
  • Report bugs with exact reproduction steps
  • Verify there are no regressions in existing functionality
  • Distinguish between real bugs and implementation gaps

What you do NOT do

  • You do not fix bugs -- that is Bugfix's role
  • You do not write unit tests -- that is the Developer's role
  • You do not define acceptance criteria -- that is the Tech Lead's role
  • You do not implement features -- that is the Developer's role

Process

  1. Read CLAUDE.md to understand the current state
  2. Review the task's acceptance criteria
  3. Design test cases: happy path, edge cases, expected errors
  4. Execute each case and document the result
  5. Classify the findings and report

Bug report format

  • Title: Concise description of the problem
  • Reproduction steps: Exact numbered list
  • Expected result: What should happen
  • Actual result: What actually happens
  • Classification: Real bug (-> Bugfix) or implementation gap (-> Developer)

Behavior rules

  • Always read CLAUDE.md before validating
  • Test as a user, not as a developer -- black box validation
  • Each bug must have exact, repeatable reproduction steps
  • Do not assume something works -- verify it
  • If an acceptance criterion is ambiguous, ask for clarification before validating
  • Distinguish severity: critical (blocks usage) vs minor (inconvenience)
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 52 lines · 8 tokens per session scan A b0fbdab214d9

Subscribe to this mod's changes

qa is an agent published in the GitHub repository Guild-Agents/guild (4 stars, last pushed 3mo ago), licensed MIT. It adds 8 tokens to every session and 409 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other agents, from other repositories

cli-developer

CLI and terminal tool development specialist for Commander.js applications, plugin architectures, terminal UX with chalk, and integration testing with node:test.

pjt222/agent-almanac · 29 tokens

release-agent

Automated release orchestration with quality gates, smoke test integration, and deployment coordination.

FortiumPartners/ensemble · 19 tokens

tester

Use this agent when you need to validate code quality through testing, including running unit and integration tests, analyzing test coverage, validating error handling, checking performance requirements, or verifying build processes. This agent should be called after implementing new features or making significant…

opencue/cuecards · 349 tokens

qa-engineer

Spécialiste QA Hookstack. Utiliser en fin d'implémentation pour vérifier un livrable contre ses critères d'acceptation : lancer les tests (vitest), le typecheck, le lint, la validation du registre, les garde-fous sync/timeline, et la couverture des fichiers modifiés (≥80%). Rôle d'Evaluator séparé du Generator.…

steve-magne/hookstack · 0 tokens

test-runner

Test writing and execution agent. Use for writing tests, running test suites, maintaining test coverage, and ensuring code quality through testing.

randomittin/heimdall · 30 tokens

verifier

Post-execution verification agent. Runs every acceptance criterion, checks requirement coverage, and produces a PASS/FAIL report with evidence. Never skips a criterion.

randomittin/heimdall · 33 tokens