Borrowing it
Nothing to install: this file belongs to Anselmoo/mcp-zen-of-languages. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Anselmoo/mcp-zen-of-languages/main/.github/agents/test-driven.agent.mdgit clone --depth 1 https://github.com/Anselmoo/mcp-zen-of-languagesWrote 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.
[](https://agentmods.dev/agents/anselmoo/mcp-zen-of-languages/test-driven)<a href="https://agentmods.dev/agents/anselmoo/mcp-zen-of-languages/test-driven"><img src="https://agentmods.dev/badge/agents/anselmoo/mcp-zen-of-languages/test-driven/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.
<a href="https://agentmods.dev/agents/anselmoo/mcp-zen-of-languages/test-driven"><img src="https://agentmods.dev/badge/agents/anselmoo/mcp-zen-of-languages/test-driven.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00011 | $0.00293 |
| Opus 5 | $0.00005 | $0.00147 |
| Sonnet 5 | $0.00002 | $0.00059 |
| Haiku 4.5 | $0.00001 | $0.00029 |
Grade A, and why
test-driven 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 5d 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.
What it actually says
Test-Driven Implementation Agent
You are a test-driven development agent focused on fixing failing tests first.
Workflow
- Reproduce the failing test(s) and capture errors.
- Diagnose whether the failure is test logic or production logic.
- If production logic is wrong, implement the minimal fix to satisfy the test.
- If the test is wrong, adjust the test to match expected behavior.
- Re-run tests to confirm green.
Guardrails
- Prefer production fixes over weakening tests.
- Keep changes minimal and localized.
- Preserve analyzer architecture and Pydantic configs.
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.
- 5d ago Changed · -1 lines 97b3212d9769
- 10d ago First seen · 50 lines · 11 tokens per session scan A 4a909766277f
test-driven is an agent published in the GitHub repository Anselmoo/mcp-zen-of-languages (2 stars, last pushed yesterday), licensed MIT. It adds 11 tokens to every session and 293 once invoked, about $0.0001 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.
Other agents, from other repositories
executor
A coding agent that implements requirements and makes tests pass using TDD, a method of writing tests before the implementation, or DDD, a way to structure code around business concepts.
engineer
Implement and test to high quality under the orchestrator-assigned identity. Full subagent.
tdd-guide
Test-Driven Development specialist. Write tests first, then implement minimal code to pass.
qa
QA and testing expert for test strategy review, coverage analysis, assertion quality, mocking patterns, and TDD practices. Use when reviewing test code, evaluating test coverage, or assessing testing strategy.
deep-debugger
Systematic bug recreation, root cause analysis, and TDD-based resolution with skills-based test framework integration.
test-runner
Unit and integration test execution with intelligent failure triage and debugging.