`thv llm setup --client claude-desktop` fails on Windows (POSIX credential-helper shim)

Summary

On Windows 11, thv llm setup --client claude-desktop detects Claude Desktop, then fails:

Warning: failed to configure claude-desktop: claude-desktop LLM gateway setup is not supported on Windows yet
Error: failed to configure any detected tools

Claude Desktop is installed here (%APPDATA%\\Claude). %LOCALAPPDATA%\\Claude-3p is empty (third-party inference never configured). The failed run did not persist thv llm config and did not write a helper script.

This is the honest sibling of #6293. Cursor reports success while writing keys the app never reads. Claude Desktop refuses up front.

Root cause

configureCredentialHelper in pkg/client/llm_gateway_credential_helper.go returns immediately on runtime.GOOS == "windows". The shim is a POSIX /bin/sh script (~/.toolhive/llm/claude-desktop-helper.sh). The comment still calls Windows a follow-up.

#6326 already made thv llm token argv-safe for Codex (command + args, no shell). Claude Desktop did not get that shape.

Repro

ToolHive v0.46.0 (c6c425a), Windows 11, Claude Desktop present.

thv llm setup --client claude-desktop --lazy --gateway-url https://127.0.0.1:9 --issuer https://127.0.0.1:9 --client-id dummy-self-found --tls-skip-verify

Same error. thv llm config show still says the gateway is not configured.

origin/main still has the Windows return (checked 2026-09-04).

Suggested direction

Give Claude Desktop a Windows helper that execs thv llm token the same way Codex already does (executable + args, no /bin/sh). Keep the POSIX .sh on Darwin/Linux.

I would like to work on this after assignment. I will not open a PR until a maintainer assigns it.

Related

• #6325 / #6326 (thv llm setup token-helper path on Windows)
• #6293 (Cursor LLM setup silent no-op)