Four Windows runtime defects from the platform audit:
- The binary stayed in the console subsystem, parking a console window
behind the GUI when launched from Explorer. Release builds now set
windows_subsystem = "windows"; debug keeps stderr tracing visible.
- Background CLI probes (model discovery, provider version checks) and
the vendored Claude SDK's per-turn spawns lacked CREATE_NO_WINDOW,
flashing console windows once the GUI detaches from the console.
- MCP stdio servers naming .cmd/.bat shims (npx and most npm-installed
servers) could not spawn: CreateProcess cannot execute shims and Rust
1.77+ refuses them as program names. vendor/agent now resolves the
command PATHEXT-style against the PATH the server will actually see
(per-server env override wins) and routes only genuine shims through
cmd /c — real executables keep direct spawn semantics.
- cmd /C start truncated URLs at `&` (every OAuth authorize URL). The
URL now travels double-quoted via raw_arg so cmd keeps it literal.
47ff290cf6