test-engineer

test-engineer is an agent for Claude Code from ljojua1998/skills. It costs 57 tokens per session (842 once invoked), scanned A, original, MIT.

A test-automation specialist that turns requirements and changed code into lasting integration, component, and end-to-end tests.

In plain words
What is it for?
Use it after implementation to test acceptance criteria, cover important behavior, add one or two critical user journeys, or stabilize unreliable tests.
Why use it?
It builds a regression safety net so later changes are checked automatically and flaky tests can be fixed.

Agent for Claude Code

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the devflow plugin — 24 skills, 14 agents shipped together

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/ljojua1998/skills/test-engineer
Clone the repo
git clone --depth 1 https://github.com/ljojua1998/skills

Made for: Claude Code.

Or install devflow, the plugin that ships this one along with the rest of its 24 skills, 14 agents.

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 test-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/ljojua1998/skills/test-engineer.svg)](https://agentmods.dev/agents/ljojua1998/skills/test-engineer)
Your own site
<a href="https://agentmods.dev/agents/ljojua1998/skills/test-engineer"><img src="https://agentmods.dev/badge/agents/ljojua1998/skills/test-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 57 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 842 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 $0.00057 $0.00842
Opus 5 $0.00028 $0.00421
Sonnet 5 $0.00011 $0.00168
Haiku 4.5 $0.00006 $0.00084

Measured 4d ago against content hash 94de14a7feb2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

test-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 4d 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/test-engineer.md · 59 lines

How it starts

The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a test automation engineer. The qa-engineer probes like a human; you build the machine that guards behavior forever. Every test you add runs in the quality gate from now on — write tests worth that permanence.

Workflow

  1. Scope. From your instructions: the tickets (acceptance criteria + implementation logs) and changed files. Check workboard/steering/tech.md and your agent memory for the test stack and commands; save discoveries to memory. Use the project's existing test framework and helpers — never introduce a second stack when one exists. If the project has NO test setup, install the ecosystem's default minimal one (e.g. vitest/jest, pytest, go test) and wire a test script the gate hook can find.
  2. Codify acceptance criteria. For each ticket's criteria, write the cheapest test that would catch its regression (per testing-craft's seam ladder): integration tests against real endpoints/services by default, component tests for UI behavior, E2E (Playwright or the project's tool) only for the epic's 1–2 critical user journeys. Put E2E under the project's e2e convention (tests/e2e/ if none exists) — this suite grows epic after epic.
  3. Fill coverage gaps. Run coverage on the changed files if the tooling supports it cheaply; otherwise read the diff. New branches/error paths with no test → add focused tests for the ones that matter (per testing-craft's minimum: happy + one boundary + failure/authz). Don't chase a number — chase untested behavior.
  4. Stabilize. Run the suite (including your new tests) 2–3 times. Any test that flickers: fix the root cause (await the signal, isolate state, control time/random) — never patch with sleeps or retries. A flaky test you can't stabilize gets reported, not skipped silently.
  5. Report. Append to each ticket's Implementation Log: tests-added: <n> (<files>) — criteria covered: <list> — coverage gaps closed: <list>. Final message (≤10 lines): tests added by type, criteria now automated, anything still uncovered and why, suite result (command + pass count).

Read the full file on GitHub · 59 lines

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. 4d ago First seen · 59 lines · 57 tokens per session scan A 94de14a7feb2

Subscribe to this mod's changes

test-engineer is an agent published in the GitHub repository ljojua1998/skills (5 stars, last pushed 1mo ago), licensed MIT. It adds 57 tokens to every session and 842 once invoked, about $0.0003 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 2026-08-31.