phantom setup calls Command::new("which") to locate phantom-mcp in PATH. which does not exist on Windows.

Location

• phantom-cli/src/commands/setup.rs:166

Fix

Use the which crate, which handles PATH resolution cross-platform and respects Windows's ; separator and PATHEXT.

let mcp_path = which::which("phantom-mcp").ok();

Severity

Blocker — phantom setup fails on Windows.

Tracker: #1