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Tool Poisoning on MCP Servers: The Attack Vector Nobody's Patching
The MCP (Model Context Protocol) ecosystem grew from a specification into production infrastructure faster than most teams can spell "threat model." And that speed left a gap: the layer where an agent
chaincoder.hashnode.dev7 min read
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Great breakdown of the tool poisoning attack surface. The deployment model matters: local stdio-based servers where tools execute on the user's machine have a very different threat profile from remote servers proxied to external endpoints. The blind spot is that even a benign tool can be weaponized through prompt injection on the MCP host side. Rate-limiting tool invocations and scoping permissions by capability (not per call) would go a long way toward making MCP safer.