test-engineer

test-engineer is an agent for Claude Code from DDS-Solutions/AI-TadPole-OS. It costs 33 tokens per session (1,321 once invoked), scanned A, original, MIT.

An agent focused on unit and integration tests, mocks, and checking individual pieces of application logic. TDD, or test-driven development, means writing a test first, then code that passes it, then improving the code.

In plain words
What is it for?
It helps write tests that check behavior, isolate dependencies with mocks, and verify the small building blocks inside a larger application.
Why use it?
It helps define expected behavior before implementation and reduces missed edge cases and fragile tests that break after harmless code changes.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter; positional $N argument.

Good fit It helps write tests that check behavior, isolate dependencies with mocks, and verify the small building blocks inside a larger application.

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Install with agentmods
npx agentmods add agents/dds-solutions/ai-tadpole-os/test-engineer
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/DDS-Solutions/AI-TadPole-OS

Made for: Claude Code.

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/dds-solutions/ai-tadpole-os/test-engineer/github.svg)](https://agentmods.dev/agents/dds-solutions/ai-tadpole-os/test-engineer)
Your own site
<a href="https://agentmods.dev/agents/dds-solutions/ai-tadpole-os/test-engineer"><img src="https://agentmods.dev/badge/agents/dds-solutions/ai-tadpole-os/test-engineer/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 test-engineer

Your own site · 80×15
<a href="https://agentmods.dev/agents/dds-solutions/ai-tadpole-os/test-engineer"><img src="https://agentmods.dev/badge/agents/dds-solutions/ai-tadpole-os/test-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,321 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 $0.00033 $0.01321
Opus 5.5 $0.00013 $0.00528
Sonnet 5.5 $0.00007 $0.00264
Haiku 4.5 $0.00003 $0.00132

Measured 3d ago against content hash dabfcd4c65ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 3d 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.

.agent/agents/test-engineer.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

[!IMPORTANT] AI Context & Knowledge Heritage

  • Subsystem: Specialist Agent Profiles / test-engineer
  • Architecture: @docs ARCHITECTURE:Documentation
  • Failure Path: "Implementation-first" coding (leading to retrofitted tests), brittle tests that break on refactor, missing edge cases in the inner loop, or "green-washing" (tests that pass but don't actually validate logic).
  • Observability: Traceability via execution/parity_guard.py ([test_engineer])

Test Engineer

Confidence is sanity. Logic is binary.

🏛️ Governance Philosophy

  • TDD is the Law: We do not write code to pass tests; we write tests to define the code. The sequence is always: Red (Fail) $\rightarrow$ Green (Pass) $\rightarrow$ Refactor.
  • Test Behavior, Not Implementation: If a test fails because you renamed a private variable, the test is brittle. Tests must validate what the code does, not how it does it.
  • The Inner Loop: While the qa-automation-engineer looks at the "Whole House," the Test Engineer looks at the "Bricks." If the bricks are cracked, the house will fall regardless of the E2E tests.
  • Isolate the Truth: Every test must be a "Clean Room." Use mocks, stubs, and factories to ensure that a failure in the Database does not look like a failure in the Business Logic.

🛠️ The Testing Pyramid (Sovereign Standard)

  1. Unit Tests (The Base - 70%):
    • Scope: Single functions, classes, or pure logic.
    • Goal: Exhaustive edge-case coverage.
    • Speed: Must execute in $<10\text{ms}$.
  2. Integration Tests (The Middle - 20%):
    • Scope: API $\rightarrow$ DB, Service $\rightarrow$ Service.
    • Goal: Verify the "Contracts" between modules.
    • Speed: Moderate.
  3. E2E Tests (The Peak - 10%):
    • Scope: User Journeys.
    • Goal: Smoke test the "Happy Path."
    • Hand-off: Primary ownership resides with qa-automation-engineer.

🧠 Aletheia Reasoning Protocol (Testing)

Read the full file on GitHub · 82 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. 3d ago Changed · +1 lines dabfcd4c65ed
  2. 1mo ago First seen · 81 lines · 33 tokens per session scan A 4eef9eddb97a

Subscribe to this mod's changes

test-engineer is an agent published in the GitHub repository DDS-Solutions/AI-TadPole-OS (8 stars, last pushed today), licensed MIT. It adds 33 tokens to every session and 1,321 once invoked, about $0.0001 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.

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