[BUG] Asana MCP connector shows as connected but tools never load in Claude Desktop conversations

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?

The Asana MCP connector (https://mcp.asana.com/v2/mcp) shows as available/connected at the top of Claude Desktop conversations, but Asana tools never load when tool_search runs. All other connectors (Gmail, Google Calendar, HubSpot) load and function correctly in the same session.

Claude Code CLI confirms the connection is healthy:

claude mcp list shows:
claude.ai Asana: https://mcp.asana.com/v2/mcp - ✓ Connected

Asana tools work correctly through Claude Code CLI. The issue is isolated to Claude Desktop.

During the OAuth flow in Claude Desktop, the Asana authorization completes successfully (Asana prompts "this program wants to open Claude," I authorize it) but the browser tab shows an infinite spinner afterward and never resolves. Closing the spinner tab and restarting Desktop does not fix it.

Disconnecting, revoking Asana OAuth tokens in Asana settings, and reconnecting does not resolve the issue. This has been tried multiple times.

What Should Happen?

Asana tools should load in Claude Desktop conversations, the same way Gmail, Google Calendar, and HubSpot tools load successfully in the same session.

Error Messages/Logs

No error messages are displayed. The Asana connector silently fails to load tools. Claude Desktop's tool_search returns zero Asana tools despite the connector showing as available in the conversation header.

During OAuth flow, the browser tab hangs on an infinite spinner after Asana's "this program wants to open Claude" authorization callback. No error message is shown.

Steps to Reproduce

1. Connect Asana via Claude Desktop Settings > Connectors
2. Complete OAuth flow (Asana prompts "this program wants to open Claude", authorize it)
3. Browser tab shows infinite spinner after authorization callback
4. Close spinner tab, restart Claude Desktop
5. Verify via Claude Code CLI: claude mcp list shows Asana as Connected
6. Open a new conversation in Claude Desktop
7. Asana appears in the connector list at the top of the conversation
8. Ask Claude to use Asana (e.g. "List my Asana workspaces")
9. Claude runs tool_search but no Asana tools are returned
10. Claude reports Asana tools are not available in this session

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.81

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Key observations:

• Gmail, Google Calendar, and HubSpot connectors all load tools correctly in the same Claude Desktop session
• Only Asana fails to load tools
• claude mcp list in Claude Code CLI shows Asana as healthy and connected
• Asana tools work correctly when used directly through Claude Code CLI
• The issue persists across multiple new conversations, Desktop restarts, and fresh OAuth authorizations
• This may be related to Asana's v2 server using Streamable HTTP transport, similar to issues reported in #23736 and #5826

Workaround: Using Asana through Claude Code CLI works. The issue is isolated to Claude Desktop's tool loading.