Worktree flag silently hangs when name contains slash

Description

When using the -w / --worktree flag with a name containing / (slash), Claude Code silently hangs after completing auth/telemetry. The TUI never launches, no error message is shown, and the process must be killed with Ctrl+C.

Steps to reproduce

claude -w 'rodz/open-8749-implement-directory-sync-mapping-with-no-access-groups'

Expected behavior

Either:

• The worktree launches successfully (as it did in previous versions ~1 week ago)
• A clear validation error like "worktree names cannot contain /"

Actual behavior

• OAuth token request completes
• Telemetry is sent to Anthropic and Datadog
• Process hangs indefinitely with blank terminal output
• No error message
• Must Ctrl+C to exit

Debug output

Running with DEBUG=* shows the auth and telemetry requests complete successfully, but the session never starts:

follow-redirects options { ... protocol: 'https:', path: '/v1/oauth/token', method: 'POST', hostname: 'platform.claude.com' ... }
follow-redirects options { ... path: '/api/event_logging/v2/batch', hostname: 'api.anthropic.com' ... }
follow-redirects options { ... path: '/api/v2/logs', hostname: 'http-intake.logs.us5.datadoghq.com' ... }

Then nothing — no further output.

Workaround

Using dashes instead of slashes in the worktree name works fine:

claude -w 'rodz-open-8749-implement-directory-sync-mapping-with-no-access-groups'

Environment

• Claude Code version: 2.1.81
• OS: macOS Darwin 24.1.0
• Shell: zsh

Notes

This worked with slash-containing worktree names approximately one week ago. The regression likely occurred in a recent update.