Borrowing it
Nothing to install: this file belongs to mrlarson2007/copilot-tdd-harness. 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/mrlarson2007/copilot-tdd-harness/master/.github/skills/tdd-cycle-runner/SKILL.mdgit clone --depth 1 https://github.com/mrlarson2007/copilot-tdd-harnessWrote 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/mrlarson2007/copilot-tdd-harness/tdd-cycle-runner)<a href="https://agentmods.dev/skills/mrlarson2007/copilot-tdd-harness/tdd-cycle-runner"><img src="https://agentmods.dev/badge/skills/mrlarson2007/copilot-tdd-harness/tdd-cycle-runner/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/skills/mrlarson2007/copilot-tdd-harness/tdd-cycle-runner"><img src="https://agentmods.dev/badge/skills/mrlarson2007/copilot-tdd-harness/tdd-cycle-runner.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 | $0.00049 | $0.00381 |
| Opus 5 | $0.00024 | $0.00191 |
| Sonnet 5 | $0.00010 | $0.00076 |
| Haiku 4.5 | $0.00005 | $0.00038 |
Grade A, and why
tdd-cycle-runner 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 9d 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 Runner Skill
Workflow
- Receive
start_cyclecontract from main orchestrator - For each phase:
- Load phase SKILL.md and asset files
- Execute phase guidance through the loaded phase skill
- Route every RED, GREEN, and REFACTOR verification through
tdd-test-runusing an explicit expected-result contract before advancing the cycle - Validate contract result
- On failure, escalate to main orchestrator
- On completion, return
cycle_completecontract
Decision Points
- If any phase fails, escalate immediately
- If all phases succeed, return cycle summary
Quality Criteria
- Only minimal context passed to each phase
- All contract handoffs validated
- No direct communication with main orchestrator by phase skill executions
- Progressive disclosure enforced
- Any rollback after a failed verification is limited to the scoped files named
in the
test_run_requestcontract
Completion Checks
- All contracts for the cycle are satisfied
- All phase outputs are validated
- Escalation path is tested
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.
- 9d ago First seen · 53 lines · 49 tokens per session scan A 18044a34f54d
tdd-cycle-runner is a skill published in the GitHub repository mrlarson2007/copilot-tdd-harness (5 stars, last pushed 3mo ago), licensed MIT. It adds 49 tokens to every session and 381 once invoked, about $0.0002 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.
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