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Implement SEP-1699: Support SSE Polling via Server-Side Disconnect · Issue #1547 · modelcontextprotocol/python-sdk · GitHub

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Implement SEP-1699: Support SSE Polling via Server-Side Disconnect #1547

Description

This is a tracking issue for implementation of SEP-1699.

Summary

This SEP proposes changes to the Streamable HTTP transport to mitigate issues with long-running connections and improve resumability by allowing servers to disconnect at will after sending an SSE event ID. The Python SDK needs to implement server-side support for immediately sending events with IDs and empty data strings to prime clients for reconnection, enable servers to close connections at any time after sending event IDs, implement retry field support to prevent excessive reconnection attempts, and ensure clients handle disconnections as network failures with proper reconnection logic using Last-Event-ID headers for seamless resumption.

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Activity

  1. moved this from Ready to In review in 2025-11-25 Implementationon Oct 30, 2025
  2. moved this from In review to Ready in 2025-11-25 Implementationon Nov 13, 2025
  3. moved this from Ready to In progress in 2025-11-25 Implementationon Nov 20, 2025
  4. moved this from In progress to Ready in 2025-11-25 Implementationon Nov 21, 2025
  5. moved this from Ready to In progress in 2025-11-25 Implementationon Nov 23, 2025
  6. linked a pull request that will close this issueAdd SSE polling support (SEP-1699) #1654on Nov 23, 2025
  7. removed
    pending SEP approvalWhen a PR is attached as an implementation detail to a SEP, we mark it as such for triage.
    on Dec 1, 2025
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