Sunsama MCP authentication fails in Claude Code CLI - redirect_uri not allowed

Description

Sunsama MCP authentication fails in Claude Code CLI with the following error in the browser:

{"error":"invalid_request","error_description":"redirect_uri not allowed for this client"}

Steps to reproduce

1. Open Claude Code CLI
2. Run /mcp and select Sunsama
3. Attempt to authenticate
4. Browser opens and shows the redirect_uri not allowed for this client error

Expected behavior

Authentication should complete successfully, as it does in other Claude products.

Working environments

• claude.ai Chat: ✅ works
• claude.ai Cowork: ✅ works
• Claude Mac App: ✅ works
• Claude Code CLI: ❌ fails

Likely cause

Sunsama has whitelisted the redirect URIs for claude.ai and the Mac App, but not the redirect URI used by Claude Code CLI (likely a localhost-based callback).