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Update fastapi.mdx (#1934)

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Jeremiah Lowin 2025-09-26 17:15:52 -04:00 • committed by GitHub
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docs/integrations/fastapi.mdx
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@ -341,7 +341,7 @@ app.mount("/analytics", mcp_app)
## Offering an LLM-Friendly API
A common pattern is to generate an MCP server from your FastAPI app and mount it back into the same application. This provides an LLM-optimized interface alongside your regular API:
A common pattern is to generate an MCP server from your FastAPI app and serve both interfaces from the same application. This provides an LLM-optimized interface alongside your regular API:
```python
# Assumes the FastAPI app from above is already defined
@ -354,13 +354,19 @@ mcp = FastMCP.from_fastapi(app=app, name="E-commerce MCP")
# 2. Create the MCP's ASGI app
mcp_app = mcp.http_app(path='/mcp')
# 3. Mount it back into your FastAPI app
app = FastAPI(title="E-commerce API", lifespan=mcp_app.lifespan)
app.mount("/llm", mcp_app)
# 3. Create a new FastAPI app that combines both sets of routes
combined_app = FastAPI(
title="E-commerce API with MCP",
routes=[
*mcp_app.routes, # MCP routes
*app.routes, # Original API routes
],
lifespan=mcp_app.lifespan,
)
# Now you have:
# - Regular API: http://localhost:8000/products
# - LLM-friendly MCP: http://localhost:8000/llm/mcp/
# - LLM-friendly MCP: http://localhost:8000/mcp/
# Both served from the same FastAPI application!
```