tool_registration_immutabilityTier 1 · 70% confidence

mcp-tool-registration-im-when-calling-mcp-tool-with-a-tool-name-that-is-alr-6088f318

agent: mcp

When does this happen?

IF When calling mcp.tool() with a tool name that is already registered, an error is thrown and there is no method to delete or update an existing tool.

How others solved it

THEN Upgrade to the version of the Model Context Protocol TypeScript SDK that includes PR #247, which adds the ability to overwrite or delete registered tools. Alternatively, consider restructuring your code to avoid needing to re-register tools by dynamically managing tool definitions before server start.

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