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MCP tool poisoning: what it looks like, and how to catch it before a server is connected

This story is from 2026-10-26. It is preserved in the archive; the latest stories are on the live feed.

When your agent connects an MCP server, the server hands it a list of tools: names, descriptions and parameter schemas. The agent reads all of that text to decide how to use the tools. You usually see the tool names. You rarely see the full descriptions. That gap is where tool poisoning lives. What…

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  1. 2026-10-26 20:04 · DEV Community — AI
    MCP tool poisoning: what it looks like, and how to catch it before a server is connected

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