Skills
MCP Denial-of-Wallet: Detecting Overthinking Loop Attacks via Token Budget Limits Per Tool Call
Malicious MCP servers can induce cyclic reasoning loops in LLM agents that amplify token consumption up to 142.4x — creating denial-of-wallet attacks invisible to traditional static analysis tools. Defense requires implementing hard token budget limits per MCP tool call (not just per session), monitoring for abnormal reasoning depth patterns, and treating unexpectedly long tool-call chains as a security event triggering circuit-breaker logic. No existing signature-based scanner catches this; it requires runtime token-consumption anomaly detection at the tool-invocation boundary.
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