Files
oh-my-pi/packages/coding-agent/test
roboomp 6c80bf6c87 fix(mcp): stayed attached on Windows stdio so nested cmd wrappers keep stdout routed back
StdioTransport.connect() unconditionally passed detached:true to
Bun.spawn. POSIX needs this so terminal job-control signals (SIGTSTP,
SIGTTIN) cannot stop stdio servers such as chrome-devtools-mcp; Windows
has no equivalent signals, but detached:true maps to
CreateProcess(DETACHED_PROCESS), which strips the parent's inherited
console. windowsHide:true (#3536) hides the direct child's window but
nothing else — when the direct child was a hidden cmd.exe wrapper that
later spawned a console grandchild (node wrapper, npx.cmd -y mcp-remote,
similar nested shells) the grandchild allocated a brand-new visible
conhost and its stdout no longer routed through OMP's pipe. The proxy
terminal reported the MCP bridge was healthy while OMP timed out
waiting for the MCP initialize response.

Move detached into StdioSpawnCommand alongside windowsHide so every
platform-derived spawn flag is resolved in one place:
resolveStdioSpawnCommand returns detached:false on every Windows return
shape (direct .exe, cmd.exe-wrapped batch/unresolvable command, npm
cmd-shim launched through node) and detached:true on POSIX. connect()
consumes the resolved flag. Add a regression test for the reporter's
exact shape (cmd.exe /C node wrapper) and assert detached on every
existing Windows / POSIX case so the contract cannot regress per-path.

Fixes #3544
2026-06-26 08:37:32 +00:00
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