CCAR-P: Claude Certified Architect — Professional

By Anthropic · Question Mode

QuestionQ46

VerifiedClaude Models, Prompting & Context Engineering

You are troubleshooting a Claude Code session in which its subagent uses 50,000 context tokens before the engineer types even a single message.

Which root cause is most likely?

Explanation

When Tool Search is disabled, Claude Code loads all configured MCP tool definitions into the context window at startup. A large collection of MCP servers can therefore consume tens of thousands of tokens before any engineer message is entered.

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