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Restrict Unix local MCP servers to stdio descriptors - #47094
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## Why Local MCP servers communicate over stdio, so unrelated parent file descriptors should not propagate into the server or its descendants. ## What changed Apply `DescriptorPolicy::StdioOnly` when launching local stdio MCP servers on Unix, preserving their explicit transport stdio. ## Testing Add Unix integration tests that check inheritable pipe, socket, and file descriptors are absent from servers and descendants across absolute, relative, and shell-fallback launches. Verify MCP communication, arguments, environment, working directory, parent descriptor ownership, and exec failure reporting remain intact. GitOrigin-RevId: 37409a5673dbaafa851fd1f78e3a2443eda5f7c6
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Restrict Unix local MCP servers to stdio descriptors
Why
Local MCP servers communicate over stdio, so unrelated parent file descriptors should not propagate into the server or its descendants.
What changed
Apply
DescriptorPolicy::StdioOnlywhen launching local stdio MCP servers on Unix, preserving their explicit transport stdio.Testing
Add Unix integration tests that check inheritable pipe, socket, and file descriptors are absent from servers and descendants across absolute, relative, and shell-fallback launches. Verify MCP communication, arguments, environment, working directory, parent descriptor ownership, and exec failure reporting remain intact.