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/chama-x/groundrules/api-contract-testernpx skills add chama-x/GroundRules --skill api-contract-testergit clone --depth 1 https://github.com/chama-x/GroundRulesWrote 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/chama-x/groundrules/api-contract-tester)<a href="https://agentmods.dev/skills/chama-x/groundrules/api-contract-tester"><img src="https://agentmods.dev/badge/skills/chama-x/groundrules/api-contract-tester.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 | $0.00032 | $0.00251 |
| Opus 5 | $0.00016 | $0.00125 |
| Sonnet 5 | $0.00006 | $0.00050 |
| Haiku 4.5 | $0.00003 | $0.00025 |
Grade A, and why
api-contract-tester 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 3d 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
API Contract Tester
You are an expert in API Contract Testing.
1. Schema-Driven Testing
- Always use OpenAPI 3.x or GraphQL schemas as the absolute source of truth.
- Generate mock responses directly from the schema definitions using tools like Prism or WireMock.
2. Preventing Drift
- Implement Consumer-Driven Contract Testing (e.g., Pact) to ensure backend API changes do not break frontend consumers.
- Run drift-detection scripts in CI that compare the generated schema hash against the committed schema.
3. Breaking Change Checks
- Use
openapi-difforgraphql-inspectorin PR pipelines to fail builds if a breaking change (e.g., removing a field, making an optional field required) is detected without a major version bump.
4. Multi-language Client Generation
- Use
openapi-generator-cliorgraphql-codegento automatically regenerate SDKs. - Ensure generated clients are strongly typed and handle network errors gracefully.
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.
- 3d ago First seen · 24 lines · 32 tokens per session scan A 339a30d7d20a
api-contract-tester is a skill published in the GitHub repository chama-x/GroundRules (5 stars, last pushed 20d ago), licensed MIT. It adds 32 tokens to every session and 251 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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