[BUG]

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?

Hi,

I am getting the following error on Claude.ai and Claude Cowork Desktop:

tools.69.FrontendRemoteMcpToolDefinition.name: String should match pattern '^[a-zA-Z0-9_-]{1,64}$'

The error does not appear on the Claude Chrome extension or the Claude mobile app, only on claude.ai in the browser and on the Cowork Desktop app.

I have already tried the following with no resolution:

• Disconnecting and removing the Meta Ads MCP (Model Context Protocol) custom connector
• Toggling off all connectors
• Hard refreshing the browser
• Checking the local Claude Desktop config file (claude_desktop_config.json), which is clean

I have been troubleshooting this with Claude AI itself and we have been unable to resolve it. I would like to escalate this to a human support agent.

My account is on the Max plan.

Thank you,
Eduardo Rocha

What Should Happen?

Hi,

I am getting the following error on Claude.ai and Claude Cowork Desktop:

tools.69.FrontendRemoteMcpToolDefinition.name: String should match pattern '^[a-zA-Z0-9_-]{1,64}$'

The error does not appear on the Claude Chrome extension or the Claude mobile app, only on claude.ai in the browser and on the Cowork Desktop app.

I have already tried the following with no resolution:

• Disconnecting and removing the Meta Ads MCP (Model Context Protocol) custom connector
• Toggling off all connectors
• Hard refreshing the browser
• Checking the local Claude Desktop config file (claude_desktop_config.json), which is clean

I have been troubleshooting this with Claude AI itself and we have been unable to resolve it. I would like to escalate this to a human support agent.

My account is on the Max plan.

Thank you,
Eduardo Rocha

Error Messages/Logs

Steps to Reproduce

Hi,

I am getting the following error on Claude.ai and Claude Cowork Desktop:

tools.69.FrontendRemoteMcpToolDefinition.name: String should match pattern '^[a-zA-Z0-9_-]{1,64}$'

The error does not appear on the Claude Chrome extension or the Claude mobile app, only on claude.ai in the browser and on the Cowork Desktop app.

I have already tried the following with no resolution:

• Disconnecting and removing the Meta Ads MCP (Model Context Protocol) custom connector
• Toggling off all connectors
• Hard refreshing the browser
• Checking the local Claude Desktop config file (claude_desktop_config.json), which is clean

I have been troubleshooting this with Claude AI itself and we have been unable to resolve it. I would like to escalate this to a human support agent.

My account is on the Max plan.

Thank you,
Eduardo Rocha

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Hi, I am getting the following error on Claude.ai and Claude Cowork Desktop: tools.69.FrontendRemoteMcpToolDefinition.name: String should match pattern '^[a-zA-Z0-9_-]{1,64}$' The error does not appear on the Claude Chrome extension or the Claude mobile app, only on claude.ai in the browser and on the Cowork Desktop app. I have already tried the following with no resolution: - Disconnecting and removing the Meta Ads MCP (Model Context Protocol) custom connector - Toggling off all connectors - Hard refreshing the browser - Checking the local Claude Desktop config file (claude_desktop_config.json), which is clean I have been troubleshooting this with Claude AI itself and we have been unable to resolve it. I would like to escalate this to a human support agent. My account is on the Max plan. Thank you, Eduardo Rocha

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_