A minimal reproduction that isolates one variable at a time establishes whether a specific input, configuration, or environment condition causes the failure and yields actionable evidence. MCP servers are external operational dependencies; Claude Code documents MCP server management and status, so listing configured servers and inspecting their status can expose connection or configuration failures. Support escalation is more effective after diagnostic evidence has been gathered, while changing model temperature or immediately rolling back a version does not constitute a complete, targeted diagnostic method.
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