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Align proxy metadata wording

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Jake Kaplan 2026-08-06 07:52:44 -04:00
commit 4dd78df06a
2 changed files with 8 additions and 7 deletions
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2
docs/servers/providers/proxy.mdx
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@ -408,7 +408,7 @@ gateway = FastMCP(
)
```
By default the gateway keeps its own `serverInfo`; pass `identity="upstream"` to expose the backend identity. Frontend values win on collisions, and protocol versions, capabilities, cache policy, `resultType`, and unknown top-level fields always remain frontend-owned. If the backend is unavailable, negotiation succeeds without its optional metadata.
By default the gateway keeps its own `serverInfo`; pass `identity="upstream"` to use the backend identity when available. Frontend instructions and `_meta` values win on collisions. The middleware never copies upstream protocol versions, capabilities, cache policy, `resultType`, or unknown top-level fields. If the backend is unavailable, negotiation succeeds without its optional metadata.
### FastMCPProxy Class

13
fastmcp_slim/fastmcp/server/providers/proxy.py
View file

@ -1048,10 +1048,10 @@ class _NegotiationMetadata:
class ProxyMetadataMiddleware(Middleware):
"""Forward optional negotiation metadata from a ``ProxyProvider`` backend.
Only instructions and namespaced metadata are forwarded, with frontend
values taking precedence. Protocol versions, capabilities, cache policy,
and result type always remain frontend-owned. ``identity`` controls whether
server identity remains the gateway's or is replaced by the backend's.
Instructions and namespaced metadata are forwarded with frontend values
taking precedence. Protocol versions, capabilities, cache policy, and result
type are never copied from the backend. ``identity`` controls whether server
identity remains the gateway's or uses the backend's when available.
"""
def __init__(
@ -1335,8 +1335,9 @@ class FastMCPProxy(FastMCP):
provider_error_strategy: How provider errors should affect aggregate
operations. Defaults to ``"warn"`` for compatibility; use
``"raise"`` when the proxy should surface upstream failures.
identity: Whether negotiation exposes the proxy's server identity or
the upstream server's. Defaults to ``"proxy"`` for compatibility.
identity: Whether negotiation retains the proxy's server identity or
uses the upstream server's when available. Defaults to ``"proxy"``
for compatibility.
**kwargs: Additional settings for the FastMCP server.
"""
super().__init__(**kwargs)