# Fastapi Foundation

> Use when porting FastAPI's request machinery (Python ASGI web framework) — the dependency-injection solver and cache, signature-to-param classification, body/query validation, response dispatch and streaming (JSONL/SSE), lazy router composition with prefix/dependency inheritance, or OpenAPI schema generation — into another framework or service. Source code and direct tests are ground truth; references carry decisive excerpts and graph retrieval.

- Skill: `ryan-brosas/fastapi-foundation` (Agent Skill, multi-file: 27 files)
- Install (CLI): `npx skillmds@latest add ryan-brosas/fastapi-foundation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ryan-brosas/fastapi-foundation/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ryan-brosas (https://skillmd.com/u/ryan-brosas)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ryan-brosas/fastapi-foundation

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# FastAPI: Python ASGI web framework foundation

## Foundation contract

This is a cold, source-specific foundation, not an operational procedure. It is
historical, revision-pinned evidence rather than timeless guidance. Current
project source, tests, requirements, and runtime behavior outrank this
projection and decide what ships.

## Provenance and revision

- Source record: `fastapi`; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.
- Recorded revision: `master@c3f316b7e814667e8ee81e03a7330d00ee61e45c`.
- Full provenance, coverage caveats, boundaries, and preserved evidence:
  `references/index.md`.

## Topic map

- Representative topics: Dependency solving; Param & body validation;
  Lifecycle; Routing; Responses & streaming; Encoding & schema generation;
  Compat & diagnostics.
- Scope and retrieval questions: `references/index.md#use-this-for`.
- Complete capsule chooser: `references/index.md#load-the-matching-source-dump`.
- Detailed grouped map: `references/index.md#capsule-map`.
- Source limitations and portability boundaries: `references/index.md#boundaries`.

## Retrieval

Open the index, choose one capsule matching the active question, and load only
that capsule. Revalidate its cited source and revision before relying on it. Do
not bulk-load the inventory, treat historical claims as current truth, or apply
this foundation as a procedure.