fast-llms-txt 0.4.0

Generate llms.txt markdown from FastAPI OpenAPI schema for AI agents

fast-llms-txt

Generate an llms.txt markdown manifest from your FastAPI OpenAPI schema for AI agents. This results in a ~75% size reduction vs the output of a OpenAPI spec JSON.

Inspired by the llms.txt specification for LLM-friendly documentation.

Installation

uv add fast-llms-txt

Usage

from fastapi import FastAPI
from fast_llms_txt import create_llms_txt_router

app = FastAPI(title="My API", description="A sample API")

@app.get("/users")
def list_users(limit: int = 10):
    """List all users."""
    return []

# Mount the llms.txt endpoint
app.include_router(create_llms_txt_router(app), prefix="/docs")

The prefix determines the final URL path. For example:

• prefix="/docs" → GET /docs/llms.txt
• prefix="/api/v1/docs" → GET /api/v1/docs/llms.txt

Now GET /docs/llms.txt returns:

# My API

> A sample API

## Endpoints

### `GET /users` - List all users.

- **Request Parameters**:
  - `limit` (integer, optional)
- **Returns** (200): Successful Response

API

create_llms_txt_router(app, path="/llms.txt")

Creates a FastAPI router that serves the llms.txt endpoint.

• app: Your FastAPI application instance
• path: The endpoint path (default: /llms.txt)

generate_llms_txt(openapi_schema)

Directly convert an OpenAPI schema dict to llms.txt markdown string.

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Appendix: Release Procedure

Versioning

This project uses semantic versioning:

• PATCH (0.1.x): Bug fixes, no API changes
• MINOR (0.x.0): New features, backward compatible
• MAJOR (x.0.0): Breaking API changes

Prerequisites

• GitHub CLI installed and authenticated (gh auth login)

Release Steps

Run the release script:

./scripts/release.sh 0.2.0

This will:

1. Update version in pyproject.toml and fast_llms_txt/__init__.py
2. Show diff and prompt for confirmation
3. Commit the version bump
4. Prompt for release notes (or auto-generate from commits)
5. Push and create GitHub release (triggers PyPI publish via GitHub Actions)

Infrastructure

• PyPI: pypi.org/project/fast-llms-txt
• Trusted Publishing: No tokens required; GitHub Actions authenticates via OIDC
• Environment: release environment in GitHub repo settings restricts publishing to v* tags