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855855### Connection timeouts
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857MCP server connections time out after 30 seconds by default. Claude Code applies that limit to the connection attempt only; to change how long a running tool call may take, set [`MCP_TOOL_TIMEOUT`](/docs/en/env-vars). If your server takes longer to start, the connection fails. Raise the connection limit with the [`MCP_TIMEOUT`](/docs/en/env-vars) environment variable, in milliseconds. For servers that need more startup time, also consider:
857MCP server connections time out after 30 seconds by default. To change how long a running tool call may take, set [`MCP_TOOL_TIMEOUT`](/docs/en/env-vars). If your server takes longer to start, the connection fails. Raise the connection limit with the [`MCP_TIMEOUT`](/docs/en/env-vars) environment variable, in milliseconds. For servers that need more startup time, also consider:
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859859* Using a lighter-weight server if available
860860* Pre-warming the server before starting your agent