What is fastapi-validation?

A guide to validating FastAPI requests and responses with Pydantic models, which describe and check data structures in Python. It focuses on type-safe API input and output.

Use it when defining checked request bodies, query data, or response models for a FastAPI service.

It helps catch malformed data at the API boundary and keeps the expected shape of requests and responses clear.

fastapi-validation — Skill for Claude Code by TheBushidoCollective/han

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.

Any agent

npx skills add TheBushidoCollective/han --skill fastapi-validation

Clone the repo

git clone --depth 1 https://github.com/TheBushidoCollective/han

Made for: Claude Code.

Or install fastapi, the plugin that ships this one along with the rest of its 3 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/thebushidocollective/han/fastapi-validation/github.svg)](https://agentmods.dev/skills/thebushidocollective/han/fastapi-validation)

Your own site

<a href="https://agentmods.dev/skills/thebushidocollective/han/fastapi-validation"><img src="https://agentmods.dev/badge/skills/thebushidocollective/han/fastapi-validation/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/thebushidocollective/han/fastapi-validation"><img src="https://agentmods.dev/badge/skills/thebushidocollective/han/fastapi-validation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,138 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00028	$0.05138
Opus 5.5	$0.00011	$0.02055
Sonnet 5.5	$0.00006	$0.01028
Haiku 4.5	$0.00003	$0.00514

Measured 1mo ago against content hash 82141fdd56eb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fastapi-validation 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.

plugins/frameworks/fastapi/skills/fastapi-validation/SKILL.md · 821 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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.

1mo ago First seen · 821 lines · 28 tokens per session scan A 82141fdd56eb

Subscribe to this mod's changes

fastapi-validation is a skill published in the GitHub repository TheBushidoCollective/han (200 stars, last pushed yesterday), with no licence file. It adds 28 tokens to every session and 5,138 once invoked, about $0.0001 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 2026-09-08.

Backend and APIs

fastapi-validation next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fastapi-validationTheBushidoCollective/han	Skill	200	yesterday	none	A	28	Claude Code
mem0-oss-to-platformmem0ai/mem0	Skill	69k	today	Apache-2.0	A	217	Claude Code, Codex
azure-mgmt-botservice-dotnetmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	78	Claude Code
fastapi-router-pymicrosoft/skills	Skill	3.2k	yesterday	MIT	A	46	Claude Code
dev-runtimelangwatch/langwatch	Skill	5.0k	yesterday	Apache-2.0	A	172	Claude Code
api-designericrisco/rsc-harness	Skill	503	2d ago	MIT	A	105	Claude Code, Codex
migrate-segw-to-raparc-mcp/arc-1	Skill	252	yesterday	MIT	A	106	Claude Code