[BUG] preview_start" fails to find .claude/launch.json inside nested git worktree (.claude/worktrees/<name>/)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Session is running in a git worktree at <repo>/.claude/worktrees/<name>/. A valid .claude/launch.json with correct JSON exists at exactly the path cited by the error message itself (verified via cat/ls). preview_start nevertheless consistently returns: "No .claude/launch.json found", including the (correct) expected path in the error message. Hypothesis: project root detection doesn't handle the .claude/worktrees/... nesting correctly (possibly sandbox path resolution stops at the outer .claude folder instead of the inner one). Workaround: curl + claude-in-chrome MCP for browser testing — works reliably.

What Should Happen?

Expected: preview_start locates .claude/launch.json at the nested worktree path and starts the preview normally, the same as it would from an unnested repo root — not report "not found" when the file demonstrably exists at the exact path the error cites.

Error Messages/Logs

Session is running in a git worktree at <repo>/.claude/worktrees/<name>/. A valid .claude/launch.json with correct JSON exists at exactly the path cited by the error message itself (verified via cat/ls). preview_start nevertheless consistently returns: "No .claude/launch.json found", including the (correct) expected path in the error message. Hypothesis: project root detection doesn't handle the .claude/worktrees/... nesting correctly (possibly sandbox path resolution stops at the outer .claude folder instead of the inner one). Workaround: curl + claude-in-chrome MCP for browser testing — works reliably.

Steps to Reproduce

Session is running in a git worktree at <repo>/.claude/worktrees/<name>/. A valid .claude/launch.json with correct JSON exists at exactly the path cited by the error message itself (verified via cat/ls). preview_start nevertheless consistently returns: "No .claude/launch.json found", including the (correct) expected path in the error message. Hypothesis: project root detection doesn't handle the .claude/worktrees/... nesting correctly (possibly sandbox path resolution stops at the outer .claude folder instead of the inner one). Workaround: curl + claude-in-chrome MCP for browser testing — works reliably.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.2086

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_