LLM Agents Invent Tool Arguments: A Sanitization Checklist Before Execution
blaizedsouza · x · 2026-08-24
Models can fabricate argument values, and those must never reach a tool raw. The author shares a tool-argument sanitization checklist: enforce types and required fields; cap string length and list size; block path traversal patterns; reject unexpected keys; normalize encodings before checks; and fail closed on any validation error. Core principle: tool input is untrusted even when the planner looks confident — validate in code after the model, not inside the prompt.
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