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Case

Forced MCP tool selection caused unauthorized simulated writes without task-scoped allowlisting

An MCP specification discussion reports 460 of 816 forced-tool trials triggered out-of-task writes, versus five without forcing; task-specific gating suppressed writes in the test.

Setting: simulationExploitation: demonstratedEvidence: Grade DRemediation: mitigation available
researchAGAINST AI2 claims
Case

pystr-codec PyPI malware uses Python startup hooks in an agent-tool supply-chain campaign

An advisory identifies malicious pystr-codec distributions that trigger payloads from Python startup hooks and reportedly modify coding-agent instruction and tool files.

Setting: research demonstrationExploitation: not establishedEvidence: Grade CRemediation: mitigation available
incidentAGAINST AI1 claims