MCP Prompt Injection Before the First Tool Call
This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.
Originally published at webofmike.com on 2026-09-11. The demo repo and every command in it were run before publishing. I built a red-team lab for the part of MCP that runs before any tool call: the instructions field a server returns from initialize and server/discover . Four attacks, each run unde…
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- 2026-09-11 16:26 · DEV Community — AI
MCP Prompt Injection Before the First Tool Call