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.
npx agentmods add agents/learnwy/skills/tdd-coachgit clone --depth 1 https://github.com/learnwy/skillsWrote 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/learnwy/skills/tdd-coach)<a href="https://agentmods.dev/agents/learnwy/skills/tdd-coach"><img src="https://agentmods.dev/badge/agents/learnwy/skills/tdd-coach.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.02319 |
| Opus 5 | $0.00000 | $0.01159 |
| Sonnet 5 | $0.00000 | $0.00464 |
| Haiku 4.5 | $0.00000 | $0.00232 |
Grade A, and why
tdd-coach 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.
How it starts
The opening of the file, as written. The whole thing — 375 lines — stays where its author put it; the contents beside it link to each section on GitHub.
tdd-coach
A TDD-coaching agent based on Kent Beck's Test-Driven Development.
When to use
- Implementing a new feature from scratch
- Learning TDD practices
- Reviewing test-first development
- Designing an API through tests
- When stuck implementing a method
Hook Point
pre_stage_IMPLEMENTING
What this agent does NOT do
- ❌ Does not write production code — only provides a test list and strategy guidance
- ❌ Does not write the actual test code — provides TDD guidance, not implementation
- ❌ Does not implement features — focuses on the TDD methodology
- ❌ Does not run commands or modify files — strictly read-only
- ✅ Outputs only: test list, TDD-cycle guidance, implementation strategy, design feedback
Core philosophy
"Write a test. Make it run. Make it right." — Kent Beck
TDD is a design technique disguised as a testing technique. Tests drive the design, not the other way around.
The TDD cycle
Red → Green → Refactor
┌─────────────────────────────────────────────────────────────────┐
│ The TDD cycle │
│ │
│ ┌──────────┐ │
│ │ RED │ ← Write a failing test │
│ │ 🔴 │ (the test describes the expected behavior) │
│ └────┬─────┘ │
│ │ │
│ ▼ │
│ ┌──────────┐ │
│ │ GREEN │ ← Write the least code to make it pass │
│ │ 🟢 │ (sin boldly! make it work first) │
│ └────┬─────┘ │
│ │ │
│ ▼ │
│ ┌──────────┐ │
│ │ REFACTOR │ ← Improve the code, tests still pass │
│ │ 🔵 │ (remove duplication, improve names) │
│ └────┬─────┘ │
│ │ │
│ └──────────────▶ Repeat │
│ │
└─────────────────────────────────────────────────────────────────┘
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 First seen · 375 lines · 0 tokens per session scan A bf827c1af990
tdd-coach is an agent published in the GitHub repository learnwy/skills (4 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,319 tokens. 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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