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 existential-birds/beagle --skill fastapi-code-reviewgit clone --depth 1 https://github.com/existential-birds/beagleWrote 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/existential-birds/beagle/fastapi-code-review)<a href="https://agentmods.dev/skills/existential-birds/beagle/fastapi-code-review"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/fastapi-code-review/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/existential-birds/beagle/fastapi-code-review"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/fastapi-code-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00043 | $0.01392 |
| Opus 5.5 | $0.00017 | $0.00557 |
| Sonnet 5.5 | $0.00009 | $0.00278 |
| Haiku 4.5 | $0.00004 | $0.00139 |
Grade A, and why
fastapi-code-review 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 — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FastAPI Code Review
Quick Reference
| Issue Type | Reference |
|---|---|
| APIRouter setup, response_model, status codes | references/routes.md |
| Depends(), yield deps, cleanup, shared deps | references/dependencies.md |
| Pydantic models, HTTPException, 422 handling | references/validation.md |
| Async handlers, blocking I/O, background tasks | references/async.md |
Review Checklist
- APIRouter with proper prefix and tags
- All routes specify
response_modelfor type safety - Correct HTTP methods (GET, POST, PUT, DELETE, PATCH)
- Proper status codes (200, 201, 204, 404, etc.)
- Dependencies use
Depends()not manual calls - Yield dependencies have proper cleanup
- Request/Response models use Pydantic
- HTTPException with status code and detail
- All route handlers are
async def - No blocking I/O (
requests,time.sleep,open()) - Background tasks for non-blocking operations
- No bare
exceptin route handlers
Valid Patterns (Do NOT Flag)
These are idiomatic FastAPI patterns that may appear problematic but are correct:
- Pydantic validates request body automatically - No manual validation needed when using typed Pydantic models as parameters
- Dependency injection for database sessions - Sessions come from
Depends(), not passed as function arguments - HTTPException for all HTTP errors - FastAPI handles conversion to proper HTTP responses
- Async def endpoint without await - May be using sync dependencies or simple operations; FastAPI handles this
- Type annotation on Depends() - This is documentation/IDE support, not a type assertion
- Query/Path/Body defaults - FastAPI processes these at runtime, not traditional Python defaults
- Returning dict from endpoint - Pydantic converts automatically if
response_modelis set
Context-Sensitive Rules
What ships with it
4 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 · 107 lines · 43 tokens per session scan A 9f5be00a46e8
fastapi-code-review is a skill published in the GitHub repository existential-birds/beagle (82 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 43 tokens to every session and 1,392 once invoked, about $0.0002 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 2026-09-16.
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