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 int2t05/engineering-skills --skill api-testinggit clone --depth 1 https://github.com/int2t05/engineering-skillsWrote 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/int2t05/engineering-skills/api-testing)<a href="https://agentmods.dev/skills/int2t05/engineering-skills/api-testing"><img src="https://agentmods.dev/badge/skills/int2t05/engineering-skills/api-testing/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/int2t05/engineering-skills/api-testing"><img src="https://agentmods.dev/badge/skills/int2t05/engineering-skills/api-testing.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 | $0.00025 | $0.00239 |
| Opus 5.5 | $0.00010 | $0.00096 |
| Sonnet 5.5 | $0.00005 | $0.00048 |
| Haiku 4.5 | $0.00003 | $0.00024 |
Grade A, and why
api-testing 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 10d 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 Testing Patterns
When to use
- Verify API contracts against a real controlled service.
Not for: api-design for defining contracts; e2e-testing for UI journeys.
Steps
-
Identify protocol, contracts, authorized environment, isolated data and tooling.
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Exercise actual requests, authentication, ownership, invalid input and lifecycle; check GraphQL transport and operation errors.
-
Test relevant pagination, concurrency and repeated requests using the contract idempotency mechanism, not tracing headers.
-
Run, inspect logs and clean only test-owned state; determine whether failures violate tests or implementation from contract evidence.
Verify
- Real service success and failure match contracts; cleanup is scoped and mock results are not labelled integration.
References
- engineering-principles.md — shared decision boundaries, scope and verification.
- references/templates/api-test-scaffold.md — REST API test scaffold template (Jest/Supertest)
What ships with it
2 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.
- 10d ago Changed · -84 lines · -31 tokens per session 45a40bb84702
- 1mo ago First seen · 116 lines · 56 tokens per session scan A fde3a28200ba
api-testing is a skill published in the GitHub repository int2t05/engineering-skills (3 stars, last pushed 10d ago), licensed MIT. It adds 25 tokens to every session and 239 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 2026-08-31.
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