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We started running every MCP server we grade. Here's what 20 popular ones actually did.

This story is from 2026-10-02. It is preserved in the archive; the latest stories are on the live feed.

Both big AI platforms check an MCP server the same way before listing it: they verify the domain, read the self-declared annotations ( readOnlyHint , destructiveHint ), and scan the policy text. Then they contain the tool at runtime. Nobody checks whether the tool behaves the way it declares. So we…

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  1. 2026-10-02 20:34 · DEV Community — AI
    We started running every MCP server we grade. Here's what 20 popular ones actually did.

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