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 cookieMonsterDev/agents-skills --skill fastapi-docsgit clone --depth 1 https://github.com/cookieMonsterDev/agents-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/cookiemonsterdev/agents-skills/fastapi-docs)<a href="https://agentmods.dev/skills/cookiemonsterdev/agents-skills/fastapi-docs"><img src="https://agentmods.dev/badge/skills/cookiemonsterdev/agents-skills/fastapi-docs/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/cookiemonsterdev/agents-skills/fastapi-docs"><img src="https://agentmods.dev/badge/skills/cookiemonsterdev/agents-skills/fastapi-docs.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 | $0.00087 | $0.01189 |
| Opus 5.5 | $0.00035 | $0.00476 |
| Sonnet 5.5 | $0.00017 | $0.00238 |
| Haiku 4.5 | $0.00009 | $0.00119 |
Grade A, and why
fastapi-docs 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.
How it starts
The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FastAPI questions are easy to answer from stale memory or Flask/Django assumptions. Use this skill to ground answers in the official FastAPI documentation and return the closest authoritative page instead of generic Python web advice.
When to Use
Use this skill when the request is about:
- FastAPI concepts, path operations, routing, and application structure
- Request parameters, body models, response models, and validation with Pydantic
- Dependencies (
Depends,Security), sub-dependencies, and dependency injection - Authentication, OAuth2, JWT, HTTP Basic, and security utilities
- Middleware, CORS, exception handlers, and custom responses
- Background tasks, lifespan events, WebSockets, and streaming/SSE
- SQL databases, testing with
TestClient, and deployment with Uvicorn - OpenAPI schema, Swagger UI, ReDoc, and API metadata
- Advanced topics: mounts, proxies, templates, static files, and async tests
Do not use this skill for:
- Django ORM, admin, or URLconf patterns. Use
django-docsinstead. - Flask blueprints, WSGI context, or Jinja-first apps. Use
flask-docsinstead. - Starlette internals unless the question is about FastAPI's documented Starlette integration.
- Pydantic-only questions with no FastAPI context unless the docs page is linked from FastAPI guides.
Workflow
1. Classify the request
Decide which bucket the question belongs to before searching:
- Getting started, installation, and first steps
- Tutorial: parameters, bodies, validation, and responses
- Dependencies and security
- Middleware, CORS, and error handling
- Databases, testing, and deployment
- Advanced: WebSockets, lifespan, mounts, proxies, templates
- API reference (
FastAPI,APIRouter,Depends, etc.) - How-to recipes and migration guides
If you need a quick starting point, load references/topic-map.md and jump to the closest section.
2. Search official FastAPI docs first
- Treat
fastapi.tiangolo.comas the source of truth for FastAPI. - Prefer pages under https://fastapi.tiangolo.com/.
- Search with the user's exact terms plus focused FastAPI phrases such as
Depends,APIRouter,response_model,HTTPException,lifespan, orTestClient. - When multiple pages are plausible, compare 2-3 candidate pages and pick the one that most directly answers the user's question.
- For Pydantic v2 migration questions, check the Pydantic v1 to v2 recipe before answering from older patterns.
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.
- 1mo ago First seen · 104 lines · 87 tokens per session scan A 16b7c04c8ba5
fastapi-docs is a skill published in the GitHub repository cookieMonsterDev/agents-skills (6 stars, last pushed today), licensed MIT. It adds 87 tokens to every session and 1,189 once invoked, about $0.0003 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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