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mcp: support SSE polling and server disconnects (SEP-1699) (#663)

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This CL implements support for SEP-1699, adding the following new API:

- Event.Retry corresponds to the 'retry' field of a server sent event.
This is used to signal client retry behavior.
- RequestExtra.CloseStream is set by the streamable transport to allow
closing a stream.

The streamable server transport is updated to set CloseStream for calls,
allowing server operations or middleware to close the underlying stream.
If the configured 'reconnectAfter' delay is set, a 'retry' message is
sent prior to terminating the stream.

The streamable client transport is updated to read the configured delay.

Fixes #630
This commit is contained in:
Robert Findley 2025-12-01 16:21:37 -05:00 • committed by GitHub
commit 623780125c
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4
internal/docs/rough_edges.src.md
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@ -10,6 +10,10 @@ v2.
**Workaround**: `Open` may be implemented as a no-op.
- `Event` need not have been exported: it's an implementation detail of the SSE
and streamable transports. Also the 'Name' field is a misnomer: it should be
'event'.
- Enforcing valid tool names: with
[SEP-986](https://github.com/modelcontextprotocol/modelcontextprotocol/issues/986)
landing after the SDK was at v1, we missed an opportunity to panic on invalid