A single poisoned agent skill can carry a weight-free conditional backdoor, with the rule in the skill file and the trigger in the query, so the payload fires only when both appear.
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ElasticBack: Stealthy Conditional Backdoor in LLM-Agent Skills via Coupled Trigger-Rule Optimization
A single poisoned agent skill can carry a weight-free conditional backdoor, with the rule in the skill file and the trigger in the query, so the payload fires only when both appear.