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docs: document support for resumability and redelivery (#606)

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Add missing documentation on resumability and redelivery in the
streamable transport.

Indirectly, also update stale transcluded examples. Example changes
weren't causing CI failure as we only trigger the docs check on changes
to the raw docs.
This commit is contained in:
Robert Findley 2025-10-27 14:00:58 -04:00 • committed by GitHub
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13
internal/docs/protocol.src.md
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@ -112,6 +112,19 @@ client, err := mcp.Connect(ctx, transport, &mcp.ClientOptions{...})
The `StreamableClientTransport` handles the HTTP requests and communicates with
the server using the streamable transport protocol.
#### Resumability and Redelivery
By default, the streamable server does not support [resumability or
redelivery](https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#resumability-and-redelivery)
of messages, because doing so requires either a persistent storage solution or
unbounded memory usage (see also
[#580](https://github.com/modelcontextprotocol/go-sdk/issues/580)).
To enable resumability, set `StreamableHTTPOptions.EventStore` to a non-nil
value. The SDK provides a `MemoryEventStore` for testing or simple use cases;
for production use it is generally advisable to use a more sophisticated
implementation.
#### Stateless Mode
The streamable server supports a _stateless mode_ by setting