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Let Client take StdioServerParameters directly (#3321)

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Max 2026-08-17 14:31:21 +01:00 • committed by GitHub
commit e473cca6a1
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1 changed files with 51 additions and 27 deletions
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13
src/mcp/client/client.py
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@ -58,6 +58,7 @@ from mcp.client.session import (
MessageHandlerFnT,
SamplingFnT,
)
from mcp.client.stdio import StdioServerParameters, stdio_client
from mcp.client.streamable_http import streamable_http_client
from mcp.client.subscriptions import ServerEvent, Subscription
from mcp.client.subscriptions import listen as _listen
@ -261,8 +262,9 @@ def _fold_extensions(extensions: Sequence[ClientExtension] | None) -> _FoldedExt
class Client:
"""A high-level MCP client for connecting to MCP servers.
Supports in-memory transport for testing (pass a Server or MCPServer instance),
Streamable HTTP transport (pass a URL string), or a custom Transport instance.
Pass a URL string (Streamable HTTP), a `StdioServerParameters` (launch the command as a
subprocess and talk over its stdin/stdout), any `Transport`, or - in tests - a `Server` or
`MCPServer` instance to connect to it in-process.
Example:
```python
@ -283,12 +285,13 @@ class Client:
```
"""
server: Server[Any] | MCPServer | Transport | str
server: Server[Any] | MCPServer | Transport | StdioServerParameters | str
"""The MCP server to connect to.
If the server is a `Server` or `MCPServer` instance, it will be connected in-process.
If the server is a URL string, it will be used as the URL for a `streamable_http_client` transport.
If the server is a `StdioServerParameters`, the command is launched with `stdio_client`.
If the server is a `Transport` instance, it will be used directly.
If the server is a `Server` or `MCPServer` instance, it will be connected in-process.
"""
_: KW_ONLY
@ -394,6 +397,8 @@ class Client:
self._connect = _connect_inproc(srv)
elif isinstance(srv, str):
self._connect = _connect_transport(streamable_http_client(srv))
elif isinstance(srv, StdioServerParameters):
self._connect = _connect_transport(stdio_client(srv))
else:
self._connect = _connect_transport(srv)