[BUG] claude mcp serve simply hangs

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.22
• Operating System: MacOS 15.5
• Terminal: ghostty

Bug Description

As mentioned here: https://docs.anthropic.com/en/docs/claude-code/mcp#use-claude-code-as-an-mcp-server
I ran claude mcp serve on the terminal inside a repo, and it just hangs with no output.

Steps to Reproduce

see above

Expected Behavior

expect to see some output

Actual Behavior

no output, hangs