fastapi-backend

fastapi-backend is a skill for Claude Code, Codex from nakano1122/dotfiles. It costs 107 tokens per session (2,596 once invoked), scanned A, original, no licence file.

A guide for building backend APIs with FastAPI, a Python web framework. It covers project structure, routes, validation, authentication, errors, asynchronous work, database access, settings, and logs.

In plain words
What is it for?
Use it to implement FastAPI APIs, organise routes, define request models, add authentication, connect an ORM, configure the service, and add structured logging.
Why use it?
It brings the main decisions for a FastAPI service into one development guide, including how requests are checked and failures are handled.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/nakano1122/dotfiles/fastapi-backend
Any agent
npx skills add nakano1122/dotfiles --skill fastapi-backend
Clone the repo
git clone --depth 1 https://github.com/nakano1122/dotfiles

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for fastapi-backend

README.md
[![agentmods](https://agentmods.dev/badge/skills/nakano1122/dotfiles/fastapi-backend.svg)](https://agentmods.dev/skills/nakano1122/dotfiles/fastapi-backend)
Your own site
<a href="https://agentmods.dev/skills/nakano1122/dotfiles/fastapi-backend"><img src="https://agentmods.dev/badge/skills/nakano1122/dotfiles/fastapi-backend.svg" alt="Measured on agentmods" height="20"></a>
Per session 107 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,596 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00107 $0.02596
Opus 5 $0.00053 $0.01298
Sonnet 5 $0.00021 $0.00519
Haiku 4.5 $0.00011 $0.00260

Measured 3d ago against content hash e66bcddd0a14, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fastapi-backend 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 3d 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.

dot_agents/skills/fastapi-backend/SKILL.md · 300 lines

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.

Read it on GitHub

Files

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.

Changes

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.

  1. 3d ago First seen · 300 lines · 107 tokens per session scan A e66bcddd0a14

Subscribe to this mod's changes

fastapi-backend is a skill published in the GitHub repository nakano1122/dotfiles (2 stars, last pushed 2mo ago), with no licence file. It adds 107 tokens to every session and 2,596 once invoked, about $0.0005 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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