Adam Perry @ OpenAI
44954d1b4b
Serialize concurrent MCP stdin writes ( #33180 )
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## What changed
- Guard executor-backed MCP stdio sends with a single-permit semaphore so a
second JSON-RPC message cannot start writing while the first write is pending.
- Add a regression test that drives two concurrent sends and verifies the
process receives each newline-delimited message in order without overlap.
GitOrigin-RevId: 30c2e51827ecf57b5eb23d9ad1e876734d6e784e
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