Error Handling

Error Handling in MCP follows the JSON-RPC 2.0 error specification. Every response to a failed request includes an error object with a code, message, and optional data.

Common Error Codes

• -32601 (Method not found): The client called a method (tool) that the server doesn't support.
• -32602 (Invalid params): The arguments provided for a tool call do not match the expected schema.
• -32603 (Internal error): Something went wrong on the server side during tool execution.

Robust error handling is critical for preventing AI "hallucinations" when an operation fails.

Intelligent Error Mitigation in HasMCP

HasMCP provides an advanced layer of Error Handling that goes beyond standard status codes. By serving as an intelligent gateway, HasMCP can intercept failures from upstream APIs and provide the AI model with semantically rich error descriptions, helping it to self-correct or seek alternative paths. Combined with Real-time Health Monitoring, HasMCP ensures that tool failures are handled gracefully, preventing a single broken endpoint from derailing complex agentic workflows and improving the overall stability of the AI system.

Questions & Answers

How does the Model Context Protocol handle errors?

MCP follows the JSON-RPC 2.0 error specification. When a request fails, the server returns an error object containing a numeric code, a human-readable message, and optional structured data.

What does the MCP error code -32602 indicate?

Error code -32602 (Invalid params) indicates that the arguments provided by the client for a tool call do not match the expected schema defined by the server.

How does HasMCP improve error handling for AI agents?

HasMCP intercepts low-level API failures and transforms them into semantically rich descriptions, which helps the AI model understand the failure and potentially self-correct or try an alternative approach.