[BUG] If there are many MCP servers added, subagents such as explore tools are not working.

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?

Agents not working if too many MCP servers added

What Should Happen?

Agents working

Error Messages/Logs

Context too long

Steps to Reproduce

Add many mcp servers
Try to launch explore agent

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.90

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

Disabling mcp servers seems to fix the bug