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A new developer joins a team using Claude Code with MCP servers for database access, CI/CD trigger, and documentation search. The onboarding guide says "configure MCP servers" but does not specify how. The developer sees package.json, .env, and an unfamiliar .mcp.json. Which file configures MCP servers and what goes in it?

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intermediate 20 min

Configuration

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A developer adds an MCP server to .mcp.json but Claude doesn't see its tools. What's likely wrong?

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A team has 10 MCP servers in .mcp.json. Claude startup is very slow. What's the likely cause?

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