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 5.5 | $0.00004 | $0.00117 |
| Sonnet 5.5 | $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 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.
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.
- 1mo ago Changed · -1 lines 97b3212d9769
- 1mo 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 3d ago), licensed MIT. It adds 11 tokens to every session and 293 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.
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engineer
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python-pro
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executor
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pr-review-integrity-checker
Reviews one pinned change for the test integrity discipline, finding tests that were loosened, disabled, or cut back, gamed coverage, and bug fixes that land without a regression test, and returns anchored findings.
swe-developer
Builds new or changed behaviour in named projects test-first under the adopted language-neutral and stack standards, and applies re-validated findings from a review, a test, or a frozen quality-gate ledger, never judging its own work.
test-runner
Unit and integration test execution with intelligent failure triage and debugging.