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 jeremylongworth-source/AgentSkills --skill api-doc-writinggit clone --depth 1 https://github.com/jeremylongworth-source/AgentSkillsWrote 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/jeremylongworth-source/agentskills/api-doc-writing)<a href="https://agentmods.dev/skills/jeremylongworth-source/agentskills/api-doc-writing"><img src="https://agentmods.dev/badge/skills/jeremylongworth-source/agentskills/api-doc-writing.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 5.1 | $0.00052 | $0.00316 |
| Opus 5 | $0.00026 | $0.00158 |
| Sonnet 5 | $0.00010 | $0.00063 |
| Haiku 4.5 | $0.00005 | $0.00032 |
Grade A, and why
api-doc-writing 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 8d 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 Doc Writing
Core Workflow
- Identify the API audience, surface area, source of truth, auth model, and version.
- Read code, specs, tests, schemas, or examples before documenting behavior.
- Document each operation with purpose, inputs, outputs, auth, errors, limits, side effects, and examples.
- Separate stable contract from implementation detail.
- Flag unknown behavior, undocumented errors, missing examples, and version mismatches.
- Include validation or review steps for generated docs.
Safety Rules
- Do not invent endpoint behavior, parameters, status codes, auth scopes, rate limits, or guarantees.
- Do not expose secrets, internal hosts, private tokens, or customer data in examples.
- Verify platform or third-party API facts from current official docs when the facts may have changed.
Deliverable Shape
For API docs, provide:
- API overview and version
- Auth and permission notes
- Operation reference
- Request and response examples
- Error behavior
- Side effects and idempotency
- Validation or review notes
References
- Read
references/api-doc-writing-checklist.mdwhen writing or reviewing API documentation.
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.
- 8d ago First seen · 46 lines · 52 tokens per session scan A 948563e1b22d
api-doc-writing is a skill published in the GitHub repository jeremylongworth-source/AgentSkills (1 stars, last pushed 5d ago), licensed MIT. It adds 52 tokens to every session and 316 once invoked, about $0.0003 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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