fix: reject duplicate streamable request ids#1006

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Zhang-986 wants to merge 1 commit into

modelcontextprotocol:mainfrom

Zhang-986:codex/streamable-duplicate-request-id

Zhang-986 commented Jun 15, 2026

Summary

Reject duplicate in-flight JSON-RPC request IDs for streamable HTTP sessions before publishing the second request.
Keep the existing request stream routing intact when a duplicate is rejected.
Add regression coverage for duplicate request stream registration.

Fixes #1004

Tests

go test ./mcp -run TestStreamableServerRejectsDuplicateInFlightRequestID -count=1
go test ./mcp -count=1
go test ./... -count=1
git diff --check


          fix: reject duplicate streamable request ids

ed2ea1b

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