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On Windows the daemon passes the full multi-line prompt as `-p <prompt>` but spawns npm's `copilot.cmd`, which we already rewrite to `powershell -File copilot.ps1`. Neither launcher can carry that argument: - `copilot.cmd` forwards with `%*`, which cmd.exe expands by re-tokenising the raw command line. - `copilot.ps1` ends in `& node.exe npm-loader.js $args`, and PowerShell re-serialises `$args` onto node's command line. Under Windows PowerShell 5.1 (and pwsh <= 7.2, which default to Legacy native argument passing) embedded double quotes are not re-escaped, so the prompt is re-tokenised. Copilot then sees several argv tokens where one was intended and refuses the run with "It looks like your prompt was not quoted, so the extra words were treated as separate arguments" — the same defect class already fixed for cursor-agent in #5649, except Copilot has no stdin prompt channel to escape through, so the prompt must stay on the command line and the launchers have to go. Copilot CLI ships a native per-platform binary and `npm-loader.js` does nothing but `spawnSync` it with argv untouched, so resolve `copilot-win32-{x64,arm64}\copilot.exe` out of the npm layout and spawn it directly. That leaves exactly one hop, Go -> native binary, and Go's syscall.EscapeArg is the exact inverse of the CRT parsing that binary uses. This mirrors resolveOpenCodeNativeFromShim / resolveDevecoNativeFromShim. Both the nested (current npm) and hoisted (older npm) platform-package locations are probed; when neither resolves, we keep falling back to the PowerShell launcher, which is still better than cmd.exe. Co-authored-by: Bohan-J <bohan@devv.ai> Co-authored-by: multica-agent <github@multica.ai>