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 skills/modimihir07/agentic-os/tdd-cyclenpx skills add modimihir07/agentic-os --skill tdd-cyclegit clone --depth 1 https://github.com/modimihir07/agentic-osWrote 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/skills/modimihir07/agentic-os/tdd-cycle)<a href="https://agentmods.dev/skills/modimihir07/agentic-os/tdd-cycle"><img src="https://agentmods.dev/badge/skills/modimihir07/agentic-os/tdd-cycle.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 | $0.00014 | $0.00241 |
| Opus 5 | $0.00007 | $0.00120 |
| Sonnet 5 | $0.00003 | $0.00048 |
| Haiku 4.5 | $0.00001 | $0.00024 |
Grade A, and why
tdd-cycle 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 6d 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
TDD Cycle
Description
Enforces the Red-Green-Refactor TDD cycle: write a failing test, make it pass, then refactor. No code is written before a test exists.
When to Use
- When implementing any new feature
- When fixing a bug
- When refactoring existing code
Process
- RED: Write a failing test for the desired behavior
- Verify test fails (confirm test is valid)
- GREEN: Write minimal code to make the test pass
- Verify test passes
- REFACTOR: Clean up code while keeping tests green
- Commit with message format:
RED|GREEN|REFACTOR: description
Rules
- Production code is only written to make a failing test pass
- Delete any code written before tests
- Never skip the RED phase
Agent Assignment
- Primary: opencode
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 6d ago First seen · 34 lines · 14 tokens per session scan A b16c6eccf223
tdd-cycle is a skill published in the GitHub repository modimihir07/agentic-os (165 stars, last pushed 25d ago), licensed MIT. It adds 14 tokens to every session and 241 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 2026-08-30.
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