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Orca Worker
e3c5bc02a9
The Windows Claude Code lifecycle hook was registered as
`powershell.exe -NoProfile -EncodedCommand <...>` whose entire decoded payload
was a `Test-Path` and a call to `~/.orca/agent-hooks/claude-hook.cmd`. Every
hook event paid a full PowerShell start-up to reach a script that exits at its
first `ORCA_PANE_KEY` guard, so sessions outside Orca paid it to do nothing.
Register the script path itself instead, with `|| echo {}` for the
neutral-JSON-when-missing contract (#14818). Measured on Windows 11, invoked as
Claude Code invokes it (`printf payload | bash -c -l "<command>"`):
idle (n=12) baseline 177ms | before 471ms | after 213ms
10-way conc (n=40) -- | before 656ms | after 296ms
p95 under load -- | before 696ms | after 337ms
It also drops an interpreter from the chain the hook's timeout kill must tear
down. Killing the hook does not kill its PowerShell grandchild, which still
holds the stdout handle the agent reads to EOF -- measured, EOF arrived 352ms
AFTER the kill, when the orphan exited by itself. msys2 creates children
suspended and resumes them after, so a kill landing in that window strands one
that never exits and EOF never comes; that is the reported frozen session.
The encoded launcher stays as the fallback for profile paths the shells cannot
carry bare (space, `%`, `^`, `&`, non-ASCII) and for hosts where Git Bash is not
resolvable, because PowerShell 5.1 rejects `||`. Every other agent's hook is
untouched, as is the remote/SSH path.
Not adopted from the report: `cmd.exe /d /c <path>` (MSYS rewrites the `/c`
under Git Bash -- measured, the invocation fails), and raising the 10s timeout
(the orphan survives the kill regardless; the fast path puts the hook 30x under
the budget so the kill effectively stops firing).