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When an MCP Tool Errors: Structured Tool Errors vs a Raw Exception

Quick answer: An MCP tool should return a structured, machine-readable error when something goes wrong, not let a raw exception bubble up. The agent calling the tool has to decide whether to retry, fix its parameters, or ask the user, and it can only do that with a stable error code and message. A…

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  1. 2026-11-02 07:13 · DEV Community — AI
    When an MCP Tool Errors: Structured Tool Errors vs a Raw Exception

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