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Versioning an MCP Server: Changing a Tool's Input Schema Without Breaking Existing Agents

Quick answer Changing an MCP tool's input schema is a breaking change for the agents that already call it, even though there is no compiled client to fail loudly. Add a required field, tighten a type, or remove a parameter, and existing prompts and automated workflows that send the old shape start…

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  1. 2026-11-03 07:55 · DEV Community — AI
    Versioning an MCP Server: Changing a Tool's Input Schema Without Breaking Existing Agents

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