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base repository: modelcontextprotocol/python-sdk
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head repository: emiapwil/python-sdk
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Commits on May 13, 2026

  1. feat: transparent session migration on server restart 

    When a StreamableHTTP server restarts, client sessions are lost and the
server returns 404 'Session not found' for any request using an old
session ID. Clients (OpenCode, etc.) do not automatically reinitialize,
leaving the connection permanently broken.

This change:
1. Detects unknown/expired session IDs and creates a new transport
   using the client's original session ID, so session ID header
   validation passes.
2. Starts the new transport in stateless mode (pre-initialized) so
   the client's first non-initialize request is accepted immediately
   without requiring the full MCP initialization handshake.

Closes #1121
    @emiapwil
    emiapwil committed May 13, 2026
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