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Merge pull request #4451 from PrefectHQ/remove/server-method-deprecations

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Remove 3.0-deprecated FastMCP server methods
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Jeremiah Lowin 2026-07-07 07:59:40 -04:00 • committed by GitHub
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22
docs/getting-started/upgrading/from-fastmcp-2.mdx
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@ -331,22 +331,22 @@ Without the extra, configuring a tool with `task=True` or `TaskConfig` will rais
### Deprecated Features
These still work but emit warnings. Update when convenient.
These were deprecated in v3. Items marked **Removed in v4** no longer work at all — update to the replacement shown. The rest still work but emit warnings; update when convenient.
**mount() prefix → namespace**
**mount() prefix → namespace** (Removed in v4)
```python
# Deprecated
# Removed in v4
main.mount(subserver, prefix="api")
# New
main.mount(subserver, namespace="api")
```
**import_server() → mount()**
**import_server() → mount()** (Removed in v4)
```python
# Deprecated
# Removed in v4
main.import_server(subserver)
# New
@ -380,10 +380,10 @@ from fastmcp.server.providers.openapi import OpenAPIProvider
server = FastMCP("my_api", providers=[OpenAPIProvider(spec, client)])
```
**add_tool_transformation() → add_transform()**
**add_tool_transformation() → add_transform()** (Removed in v4)
```python
# Deprecated
# Removed in v4
mcp.add_tool_transformation("name", config)
# New
@ -391,15 +391,19 @@ from fastmcp.server.transforms import ToolTransform
mcp.add_transform(ToolTransform({"name": config}))
```
**FastMCP.as_proxy() → create_proxy()**
**FastMCP.as_proxy() → create_proxy()** (Removed in v4)
The proxy target is passed positionally in both APIs, so most calls migrate unchanged. If you passed the target by keyword, note that the parameter was renamed from `backend=` to `target=`.
```python
# Deprecated
# Removed in v4
proxy = FastMCP.as_proxy("http://example.com/mcp")
proxy = FastMCP.as_proxy(backend="http://example.com/mcp") # keyword form
# New
from fastmcp.server import create_proxy
proxy = create_proxy("http://example.com/mcp")
proxy = create_proxy(target="http://example.com/mcp") # as_proxy(backend=X) → create_proxy(target=X)
```
## v2.14.0