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Make CacheConfig() the Client cache default and None the off switch (#3164)

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Max 2026-07-25 17:50:53 +01:00 • committed by GitHub
commit 0cb920f126
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1 changed files with 18 additions and 17 deletions
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src/mcp/client/client.py
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@ -349,14 +349,15 @@ class Client:
transparently by `call_tool`), and its notification bindings. For an
ad-only entry use `mcp.client.advertise(identifier, settings)`."""
cache: CacheConfig | Literal[False] | None = None
cache: CacheConfig | None = field(default_factory=CacheConfig)
"""Client-side response caching for the SEP-2549 cacheable methods (2026-07-28).
`None` (the default) honors server `ttlMs`/`cacheScope` hints with a per-client
in-memory store; pass a `CacheConfig` to customize, or `False` to disable. The
cacheable verbs take a per-call `cache_mode` (see `CacheMode`); calls carrying
`meta` always reach the server. A `CacheConfig` with a custom `store` requires
`target_id` when the server is not a URL (no identity can be derived)."""
The default `CacheConfig()` honors server `ttlMs`/`cacheScope` hints with a
per-client in-memory store; pass a customized `CacheConfig`, or `None` to
disable. The cacheable verbs take a per-call `cache_mode` (see `CacheMode`);
calls carrying `meta` always reach the server. A `CacheConfig` with a custom
`store` requires `target_id` when the server is not a URL (no identity can be
derived)."""
_entered: bool = field(init=False, default=False)
_session: ClientSession | None = field(init=False, default=None)
@ -388,8 +389,8 @@ class Client:
else:
self._connect = _connect_transport(srv)
if self.cache is not False:
config = self.cache if self.cache is not None else CacheConfig()
if self.cache is not None:
config = self.cache
# Only the hash below leaves this scope - the raw identity may carry credentials; never log or store it.
target_id = config.target_id
if target_id is None and isinstance(self.server, str):