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Remove deprecated fastmcp.server.openapi shim + FastMCPOpenAPI (3.0)

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Jeremiah Lowin 2026-07-06 21:22:49 -04:00
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docs/getting-started/upgrading/from-fastmcp-2.mdx
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@ -355,10 +355,10 @@ main.mount(subserver)
**Module import paths for proxy and OpenAPI**
The proxy and OpenAPI modules have moved under `providers` to reflect v3's provider-based architecture:
The proxy and OpenAPI modules moved under `providers` to reflect v3's provider-based architecture. The old `fastmcp.server.proxy` and `fastmcp.server.openapi` compatibility shims were **removed in 4.0** — import from the `providers` location instead:
```python test="skip"
# Deprecated
# Removed in 4.0
from fastmcp.server.proxy import FastMCPProxy
from fastmcp.server.openapi import FastMCPOpenAPI
@ -367,10 +367,10 @@ from fastmcp.server.providers.proxy import FastMCPProxy
from fastmcp.server.providers.openapi import OpenAPIProvider
```
`FastMCPOpenAPI` itself is deprecated — use `FastMCP` with an `OpenAPIProvider` instead:
`FastMCPOpenAPI` was **removed in 4.0** — use `FastMCP` with an `OpenAPIProvider` instead:
```python test="skip"
# Deprecated
# Removed in 4.0
from fastmcp.server.openapi import FastMCPOpenAPI
server = FastMCPOpenAPI(spec, client)
@ -406,14 +406,16 @@ proxy = create_proxy("http://example.com/mcp")
### OpenAPI Parser Promotion
The experimental OpenAPI parser is now standard. Update imports:
The experimental OpenAPI parser is now standard. The `fastmcp.experimental.server.openapi` and `fastmcp.server.openapi` shims were both **removed in 4.0** — use `FastMCP` with an `OpenAPIProvider` instead:
```python test="skip"
# Before
from fastmcp.experimental.server.openapi import FastMCPOpenAPI
# After
from fastmcp.server.openapi import FastMCPOpenAPI
# After (removed in 4.0 — use OpenAPIProvider)
from fastmcp import FastMCP
from fastmcp.server.providers.openapi import OpenAPIProvider
server = FastMCP("my_api", providers=[OpenAPIProvider(spec, client)])
```
### Removed Deprecated Features