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.
git clone --depth 1 https://github.com/KaelSensei/MagicAIBuilderWrote 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/rules/kaelsensei/magicaibuilder/tdd-skill)<a href="https://agentmods.dev/rules/kaelsensei/magicaibuilder/tdd-skill"><img src="https://agentmods.dev/badge/rules/kaelsensei/magicaibuilder/tdd-skill/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/rules/kaelsensei/magicaibuilder/tdd-skill"><img src="https://agentmods.dev/badge/rules/kaelsensei/magicaibuilder/tdd-skill.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 | $0.00118 | $0.00118 |
| Opus 5.5 | $0.00047 | $0.00047 |
| Sonnet 5.5 | $0.00024 | $0.00024 |
| Haiku 4.5 | $0.00012 | $0.00012 |
Grade A, and why
tdd-skill 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 23d 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 Skill Routing
Before implementing or correcting production behavior, read and apply
.agents/skills/tdd/SKILL.md. Also load it for behavior-preserving refactoring
or when reviewing claimed TDD evidence, so its scope and exceptions are respected.
The skill is the single source of truth for the TDD method. Do not duplicate or replace its instructions in this rule. If it is missing or unreadable, report that limitation instead of claiming that it was applied.
Follow the repository's separate execution, security and delivery constraints.
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.
- 23d ago Changed · -82 lines · -789 tokens per session 8953ff74277c
- 1mo ago Changed · +24 lines · +265 tokens per session 73fc4e1a934e
- 2mo ago First seen · 74 lines · 642 tokens per session scan A ce5f915bf5db
tdd-skill is a cursor rule published in the GitHub repository KaelSensei/MagicAIBuilder (2 stars, last pushed yesterday), licensed MIT. It adds 118 tokens to every session, about $0.0005 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.
Other cursor rules, from other repositories
tdd-domain
TDD contract for business logic.
test-intent-readability
Tests must be readable by context (BDD-style grouping).
upgrade-tests
// ✅ CORRECT: Upgrade package pattern await using ctx = testReactResource(appRouter, { server: { // server configuration }, client(opts) { return { links: [ httpLink({ url: opts.httpUrl, // client configuration }), ], }; }, }).
react-query-tests
// ✅ CORRECT: Legacy React Query pattern const ctx = konn() .beforeEach(() => createAppRouter()) .afterEach((ctx) => ctx?.close?.()) .done().
tanstack-react-query-tests
// ✅ CORRECT: Use await using for automatic cleanup await using ctx = testReactResource(appRouter, { server: { // server configuration }, client(opts) { return { links: [ httpLink({ url: opts.httpUrl, // client configuration }), ], }; }, }).
test-patterns
// ✅ CORRECT: Use await using for automatic cleanup await using ctx = testServerAndClientResource(router, { client(opts) { return { links: [ httpLink({ url: opts.httpUrl, fetch: mockFetch, }), ], }; }, }).