[BUG] Zapier MCP gmail_send_email tool not found

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?

*Environment: Claude Code [version] on macOS
MCP Server: Zapier MCP (gmail_send_email)
Error: MCP error -32602: Tool gmail_send_email not found
Steps to reproduce:**

1. Connect Zapier MCP server with Gmail "Send Email" action configured
2. Ask Claude to send an email via Gmail
3. Claude calls gmail_send_email → error returned

Expected: Email sent successfully
Actual: "Tool gmail_send_email not found" — tool is visible and tested
successfully in Zapier's own interface, but Claude cannot invoke it via MCP
Note: Zapier's test button confirms Gmail is connected and working.
The issue appears to be a tool name mismatch between Claude Code's MCP
catalog and Zapier's actual MCP server.

What Should Happen?

Description

When Claude Code calls gmail_send_email via Zapier MCP, it returns:
MCP error -32602: Tool gmail_send_email not found

Gmail is fully configured in Zapier MCP and works when tested directly
from Zapier's interface. The issue is a tool name mismatch — Zapier's
MCP server doesn't recognize the tool name gmail_send_email that
Claude Code sends.

Environment

• Claude Code on macOS
• Zapier MCP server connected
• Gmail "Send Email" action configured and account connected

Steps to Reproduce

1. Add Zapier MCP server to Claude Code
2. Configure Gmail "Send Email" action in Zapier MCP
3. Ask Claude to send an email via Gmail
4. Claude calls gmail_send_email → error

Expected

Email sent successfully

Actual

MCP error -32602: Tool gmail_send_email not found

Notes

• Zapier's own Test button confirms Gmail works correctly
• Same error occurs for microsoft_outlook_send_email
• get_configuration_url tool works fine — server is connected
• Problem appears to be naming mismatch between Claude's static

tool catalog and what Zapier's MCP server actually exposes at runtime

Error Messages/Logs

Steps to Reproduce

Description

When Claude Code calls gmail_send_email via Zapier MCP, it returns:
MCP error -32602: Tool gmail_send_email not found

Gmail is fully configured in Zapier MCP and works when tested directly
from Zapier's interface. The issue is a tool name mismatch — Zapier's
MCP server doesn't recognize the tool name gmail_send_email that
Claude Code sends.

Environment

• Claude Code on macOS
• Zapier MCP server connected
• Gmail "Send Email" action configured and account connected

Steps to Reproduce

1. Add Zapier MCP server to Claude Code
2. Configure Gmail "Send Email" action in Zapier MCP
3. Ask Claude to send an email via Gmail
4. Claude calls gmail_send_email → error

Expected

Email sent successfully

Actual

MCP error -32602: Tool gmail_send_email not found

Notes

• Zapier's own Test button confirms Gmail works correctly
• Same error occurs for microsoft_outlook_send_email
• get_configuration_url tool works fine — server is connected
• Problem appears to be naming mismatch between Claude's static

tool catalog and what Zapier's MCP server actually exposes at runtime

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

claude --version

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_