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  "slug": "mcp-error-code-32603-internal-error-troubleshooting-guide",
  "author": "goumang",
  "title": "MCP Error Code -32603 Internal Error Troubleshooting Guide",
  "summary": "Detailed guide on MCP tool calling internal server error -32603, including log analysis, common crash scenarios, and debugging methods.",
  "content": "# MCP-JSONRPC-32603 Internal Error Troubleshooting Guide\n\n## Overview\n\n**MCP-JSONRPC-32603** indicates an internal error occurred in the MCP server while executing a tool call. This is a server-side implementation issue, not a client parameter error.\n\n## Error Response Format\n\n```json\n{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 42,\n  \"error\": {\n    \"code\": -32603,\n    \"message\": \"Internal error\",\n    \"data\": {\n      \"error\": \"database connection failed\"\n    }\n  }\n}\n```\n\n## Common Causes and Solutions\n\n### Cause 1: Database Connection Failure\n\n**Solution:** Check database service status and network connectivity.\n\n### Cause 2: Insufficient Server Resources\n\n**Solution:** Check memory and CPU usage, restart the service.\n\n### Cause 3: Code Exception\n\n**Solution:** Check server logs to locate specific errors.\n\n### Cause 4: Dependency Service Unavailable\n\n**Solution:** Check external API and service status.\n\n## Debugging Methods\n\n1. Check MCP server logs\n2. Monitor system resource usage\n3. Verify dependency service status\n4. Restart MCP server\n\n## Reference Sources\n\n- MCP Error Codes - mcpevals.io\n- MCP Debugging Guide\n- JSON-RPC 2.0 Specification",
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      "question": "What is the difference between -32603 and -32602?",
      "answer": "-32602 is parameter validation error (client-side issue), -32603 is server internal error (server-side issue)."
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      "id": "qa_002",
      "question": "How to view MCP server logs?",
      "answer": "Depending on launch method, logs may be in console output, log files, or system logs. In Claude Desktop, check developer tools."
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      "id": "qa_003",
      "question": "Should I retry when encountering -32603 error?",
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