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 mvilrokx/claude-skills --skill fastapi-code-reviewgit clone --depth 1 https://github.com/mvilrokx/claude-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/mvilrokx/claude-skills/fastapi-code-review)<a href="https://agentmods.dev/skills/mvilrokx/claude-skills/fastapi-code-review"><img src="https://agentmods.dev/badge/skills/mvilrokx/claude-skills/fastapi-code-review.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 | $0.00082 | $0.00972 |
| Opus 5 | $0.00041 | $0.00486 |
| Sonnet 5 | $0.00016 | $0.00194 |
| Haiku 4.5 | $0.00008 | $0.00097 |
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 7d 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 — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FastAPI Code Review
Perform comprehensive code reviews of FastAPI projects against industry best practices, identifying violations and generating actionable refactor plans.
Review Process
1. Gather Project Context
Before reviewing, collect information about the project:
- Project structure (list_dir on root and key directories)
- Main application entry point (typically main.py or app.py)
- Router definitions and API endpoints
- Pydantic models/schemas
- Database models and connections
- Dependencies and middleware
- Configuration management
- Test files
2. Execute Review Checklist
Evaluate each category against the best practices in references/best-practices.md.
Review Categories:
- Project Structure
- Async/Sync Patterns
- Pydantic Usage
- Dependency Injection
- API Design (REST)
- Database Patterns
- Testing Patterns
- Configuration Management
- Performance Optimizations
- Documentation
3. Generate Refactor Plan
For each violation found, document:
## Refactor Plan
### Critical Issues (Fix Immediately)
| Issue | Location | Best Practice Violated | Refactor Action |
|-------|----------|------------------------|-----------------|
| ... | ... | ... | ... |
### High Priority (Fix Soon)
| Issue | Location | Best Practice Violated | Refactor Action |
|-------|----------|------------------------|-----------------|
| ... | ... | ... | ... |
### Medium Priority (Plan for Refactor)
| Issue | Location | Best Practice Violated | Refactor Action |
|-------|----------|------------------------|-----------------|
| ... | ... | ... | ... |
### Low Priority (Nice to Have)
| Issue | Location | Best Practice Violated | Refactor Action |
|-------|----------|------------------------|-----------------|
| ... | ... | ... | ... |
Quick Reference: Common Violations
Critical (Blocking Event Loop)
time.sleep()in async routes → Useasyncio.sleep()or make route sync- Sync database calls in async routes → Use async database drivers
- Sync HTTP calls in async routes → Use
httpx.AsyncClient
What ships with it
1 file 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.
- 7d ago First seen · 142 lines · 82 tokens per session scan A 3f9f27193c21
fastapi-code-review is a skill published in the GitHub repository mvilrokx/claude-skills (2 stars, last pushed 6mo ago), licensed MIT. It adds 82 tokens to every session and 972 once invoked, about $0.0004 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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