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 skills add LucasSantana-Dev/sharekit --skill tddgit clone --depth 1 https://github.com/LucasSantana-Dev/sharekitWrote 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/lucassantana-dev/sharekit/tdd)<a href="https://agentmods.dev/skills/lucassantana-dev/sharekit/tdd"><img src="https://agentmods.dev/badge/skills/lucassantana-dev/sharekit/tdd/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/lucassantana-dev/sharekit/tdd"><img src="https://agentmods.dev/badge/skills/lucassantana-dev/sharekit/tdd.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 | $0.00029 | $0.00390 |
| Opus 5.5 | $0.00012 | $0.00156 |
| Sonnet 5.5 | $0.00006 | $0.00078 |
| Haiku 4.5 | $0.00003 | $0.00039 |
Grade A, and why
tdd 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 Development (Short)
This is the quick-reference alias for test-driven-development. Use this when you want the essentials; use the full skill for comprehensive guidance, extensive examples, and rationalization handling.
Core Rule
NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST
Write code before the test? Delete it. Start over.
Red-Green-Refactor Cycle
RED → Failing test
GREEN → Minimal code to pass
REFACTOR → Clean up (tests still green)
REPEAT
Discipline: Tracer Bullets, Not Horizontal Slices
One test → one implementation → repeat.
Avoid "horizontal slicing" (write all tests, then all code). This produces tests coupled to implementation shape rather than behavior. Vertical slices (one test + one impl per cycle) keep tests responsive to what you actually learned.
Essential Rules
- Watch every test fail before implementing
- Write minimal code — only enough to pass current test
- Don't anticipate future tests
- Never refactor while RED
- After green, refactor freely; tests catch breaks
- Tests use public interfaces, not mocks of internals
Verification Checklist
- Test describes behavior, not implementation
- Test uses public interface only
- Watched test fail before implementing
- Code is minimal for this test
- All tests pass
See Full Skill
For comprehensive workflows, rationalization handling, and examples, see test-driven-development or invoke /test-driven-development.
What ships with it
4 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.
- 1mo ago First seen · 58 lines · 29 tokens per session scan A 092dbb0cf269
tdd is a skill published in the GitHub repository LucasSantana-Dev/sharekit (1 stars, last pushed 3d ago), licensed MIT. It adds 29 tokens to every session and 390 once invoked, about $0.0001 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 2026-09-03.
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