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Float timeout in composite config transport; retitle client context shim (SDK v2)

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Jeremiah Lowin 2026-07-05 21:27:10 -04:00
commit ca9c18fb9d
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2 changed files with 14 additions and 13 deletions
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20
fastmcp_slim/fastmcp/client/_sdk_context_shim.py
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@ -1,14 +1,16 @@
"""SDK context survival shims pending the Phase C client port.
"""Subscriptable request-context alias for FastMCP client handler signatures.
The MCP SDK v2 removed ``mcp.shared.context.RequestContext`` and
``mcp.shared.context.LifespanContextT``. Client-side handler signatures in
FastMCP still reference them as type annotations. These shims keep those
modules importable at collection time; the annotations they feed are not
semantically load-bearing yet.
FastMCP exposes public generic handler type aliases (``SamplingHandler``,
``RootsHandler``, ``ElicitationHandler``) parameterized over a session and a
lifespan-context type. The MCP SDK v2 request context (
``mcp.client.ClientRequestContext``) is a plain ``kw_only`` dataclass and is
NOT subscriptable, so it cannot back those two-parameter aliases directly.
TODO(sdkv2): replace with the real SDK client request-context type in Phase C
(client port). Handler wiring that populates/consumes the request context is
reworked there.
This module keeps a subscriptable ``RequestContext[SessionT, LifespanContextT]``
generic so the public alias surface is preserved unchanged. It is a permanent
part of the client type surface, not a migration placeholder. The concrete
context object handlers receive at runtime is the SDK's ``ClientRequestContext``;
our ``create_*_callback`` wrappers pass it through opaquely.
"""
from __future__ import annotations

3
fastmcp_slim/fastmcp/client/transports/config.py
View file

@ -1,5 +1,4 @@
import contextlib
import datetime
from collections.abc import AsyncIterator
from typing import TYPE_CHECKING, Any
@ -147,7 +146,7 @@ class MCPConfigTransport(ClientTransport):
self,
name: str,
config: MCPServerTypes,
timeout: datetime.timedelta | None,
timeout: float | None,
stack: contextlib.AsyncExitStack,
) -> tuple[ClientTransport, Any, "FastMCP[Any]"]:
"""Create underlying transport, proxy client, and proxy server for a single backend.