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 idiscoord13-sketch/agent-jail-mcp --skill fastapigit clone --depth 1 https://github.com/idiscoord13-sketch/agent-jail-mcpWrote 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/idiscoord13-sketch/agent-jail-mcp/fastapi)<a href="https://agentmods.dev/skills/idiscoord13-sketch/agent-jail-mcp/fastapi"><img src="https://agentmods.dev/badge/skills/idiscoord13-sketch/agent-jail-mcp/fastapi/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/idiscoord13-sketch/agent-jail-mcp/fastapi"><img src="https://agentmods.dev/badge/skills/idiscoord13-sketch/agent-jail-mcp/fastapi.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 | $0.00057 | $0.02291 |
| Opus 5 | $0.00028 | $0.01145 |
| Sonnet 5 | $0.00011 | $0.00458 |
| Haiku 4.5 | $0.00006 | $0.00229 |
Grade A, and why
fastapi 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 11d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
6 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.
- 11d ago First seen · 322 lines · 57 tokens per session scan A 989e5136ad01
fastapi is a skill published in the GitHub repository idiscoord13-sketch/agent-jail-mcp (0 stars, last pushed 1mo ago), with no licence file. It adds 57 tokens to every session and 2,291 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.
Other skills, from other repositories
fastapi-routes
Create or modify FastAPI routes. Use when: adding new API endpoints, creating Pydantic request/response models, registering routers, designing REST APIs, or following route conventions for this project.
typer-cli
Add or modify CLI commands using Typer. Use when: adding new CLI subcommands, wrapping async functions for CLI use, understanding the CLI entrypoint structure, or following the @syncify pattern for async commands.
python
Enforces FastAPI, Dependency Injection, and general Python coding standards based on the repository structure.
background-task
Add or modify work that runs outside the request/response cycle — emails, document ingestion, webhooks, cleanups, scheduled jobs. Use when something is slow or fire-and-forget, or when adding a periodic/cron task. This project's queue is {{ cookiecutter.backgroundtasks }}.
channel-bot
Work with messaging-channel bots (Telegram / Slack) — register a bot, route inbound messages through the AI agent, handle webhooks vs polling, or add a new channel adapter. Use when wiring chat into a messaging platform or debugging bot delivery.
python-backend
Production Python async patterns including asyncio TaskGroup, FastAPI dependency injection and middleware, SQLAlchemy 2.0 async sessions, and database connection pool tuning. Python 3.11+ runtime concerns such as ExceptionGroup, cancellation semantics, and session rollback. Use when building async services, wiring…