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Implement MCP 2026-07-28 (#2286)

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Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
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# sse-polling
SEP-1699 server-initiated SSE disconnection + client reconnection with `Last-Event-ID` replay. **Sessionful 2025** by definition (the feature lives on `NodeStreamableHTTPServerTransport` + an `EventStore`). `eventStore` resumability is a 2025-session concern with no 2026-07-28
per-request equivalent.
The `long-operation` tool emits two log notifications, calls `ctx.http?.closeSSE()` mid-stream, emits two more while the client is disconnected, then returns. The client transport reconnects after `retryInterval` (300 ms) with `Last-Event-ID`; the event store replays the buffered
events. The client asserts the result arrived AND the post-disconnect log was delivered.
```bash
pnpm --filter @mcp-examples/sse-polling server -- --http --port 3001 # term 1
pnpm --filter @mcp-examples/sse-polling client -- --http http://127.0.0.1:3001/mcp # term 2
```