[BUG] MCP Server Tools Not Callable Despite Authentication

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?

Description:
After authenticating MCP servers (Gmail, Google Calendar, etc.) through Claude Code, the servers show as "✔
Connected" in claude mcp list, but their individual tools are not exposed as callable functions in Claude's
available tools.

Steps to Reproduce:

1. Run claude mcp list and confirm Gmail/Calendar show "✔ Connected"
2. Attempt to use ToolSearch to find Gmail send/Calendar create tools
3. Search returns only authentication tools, not the actual MCP tool functions

Expected Behavior:
Once authenticated, MCP server tools should be callable by Claude through the standard tool interface.

Actual Behavior:
MCP tools remain inaccessible despite successful connection. Makes the authentication process pointless.

Impact:
Users cannot leverage connected MCP servers for autonomous actions (sending emails, creating calendar events,
etc.) even after setup.

What Should Happen?

1. User authenticates an MCP server (Gmail, Google Calendar, etc.) through Claude Code
2. Server shows as "✔ Connected" in claude mcp list ✓ (this part works)
3. Claude should have full access to that server's tools (send_email, create_calendar_event,

search_emails, etc.)

1. Claude should be able to call those tools directly and autonomously
2. User can ask Claude to "send me an email about X" or "create a calendar reminder for tomorrow

at 7pm" and it actually happens

Error Messages/Logs

Steps to Reproduce

1. Install Claude Code CLI (version 2.1.183 or current)
2. Check available MCP servers:

claude mcp list

1. Output shows cloud connectors available (Gmail, Google Calendar, etc.)
2. Authenticate Gmail MCP server:

• Run claude mcp list
• Select "claude.ai Gmail" (or via /mcp in interactive mode)
• Complete OAuth flow on web interface
• Verify status shows "✔ Connected"

1. Attempt to access Gmail tools:

• Search for Gmail tools using ToolSearch with queries like:
• gmail send
• gmail compose
• send email
• Result: Only authentication tools appear, not actual Gmail functions

1. Attempt to send email:

• Try asking Claude to "send an email" or "compose a message"
• Expected: Claude uses Gmail MCP to send the email
• Actual: No Gmail send tools available

1. Verify the issue:

claude mcp list

1. Shows: claude.ai Gmail: https://gmailmcp.googleapis.com/mcp/v1 - ✔ Connected

1. But no callable tools (send_email, get_messages, create_draft, etc.) are accessible to Claude

Expected Result: Authenticated MCP server tools should be callable

Actual Result: MCP tools remain inaccessible despite successful authentication

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.183

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_