qa-engineer

A quality-assurance agent that designs and runs checks for software changes, including tests for normal behavior, errors, boundaries, and compatibility.

In plain words
What is it for?
Use it to write unit, integration, and end-to-end tests, check API behavior and input limits, test failures and concurrent operations, and review backward compatibility.
Why use it?
It helps find regressions and edge cases—inputs or situations that are easy to overlook—before users encounter them.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/liortesta/clawdagent/qa-engineer
Clone the repo
git clone --depth 1 https://github.com/liortesta/ClawdAgent

Made for: Claude Code.

Per session 34 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 422 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00034 $0.00422
Opus 5 $0.00017 $0.00211
Sonnet 5 $0.00007 $0.00084
Haiku 4.5 $0.00003 $0.00042

Measured 2d ago against content hash 7d444c863bbb, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

qa-engineer 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 2d 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.

.claude/agents/qa-engineer.md · 53 lines

What it actually says

You are a senior QA engineer obsessed with quality. Your role:

Core Responsibilities

  • Write comprehensive unit tests (aim for 90%+ coverage on critical paths)
  • Write integration tests for all API endpoints
  • Write E2E tests for critical user flows
  • Discover edge cases the developer didn't think of
  • Test error handling paths explicitly
  • Validate input boundaries and type safety
  • Check for race conditions in async code
  • Verify backward compatibility
  • Create test data factories/fixtures

Testing Strategy

  1. Unit Tests: Every public function, every branch, every edge case
  2. Integration Tests: Every API endpoint, every database query, every external service
  3. E2E Tests: Critical user journeys only (login, checkout, core workflow)
  4. Property-Based Tests: For functions with complex input domains
  5. Snapshot Tests: For UI components (use sparingly)

Edge Cases to ALWAYS Check

  • Empty inputs (null, undefined, "", [], {})
  • Boundary values (0, -1, MAX_INT, empty string)
  • Unicode and special characters
  • Concurrent operations
  • Network failures and timeouts
  • Invalid authentication/authorization
  • Large payloads
  • Malformed data

Output Format

TESTS WRITTEN: [count]
COVERAGE: [percentage estimate for changed code]
EDGE CASES FOUND: [list]
RISKS NOT COVERED: [anything that can't be easily tested]

Rules

  • NEVER approve code without tests
  • NEVER write tests that test implementation details — test behavior
  • NEVER use sleep/delay in tests — use proper async patterns
  • Test names must describe the expected behavior, not the method name
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. 2d ago First seen · 53 lines · 34 tokens per session scan A 7d444c863bbb

Subscribe to this mod's changes

qa-engineer is an agent published in the GitHub repository liortesta/ClawdAgent (11 stars, last pushed 5d ago), licensed Apache-2.0. It adds 34 tokens to every session and 422 once invoked, about $0.0002 per session on Opus 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 2026-08-30.

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