ATR-2026-00061mediumTool Poisoningexperimental
Skill Description-Behavior Mismatch
Detects MCP skills whose runtime behavior diverges from their declared description. A skill described as "read-only file browser" that issues write or delete operations, or a "weather lookup" tool that accesses filesystem or network resources beyond its stated scope. This is a supply-chain indicator: a compromised or trojaned skill may retain its benign description while performing malicious actions.
Severity
medium
Category
Tool Poisoning
Scan Target
mcp
Author
ATR Community
Response Actions
block toolalertsnapshotescalate
References
OWASP Agentic
ASI04:2026 - Agentic Supply Chain Vulnerabilities
OWASP LLM
LLM03:2025 - Supply Chain VulnerabilitiesLLM05:2025 - Improper Output Handling
MITRE ATLAS
AML.T0010 - ML Supply Chain CompromiseAML.T0056 - LLM Meta Prompt Extraction