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Activation steering manipulates large language model behavior by intervening on internal activations, but the mechanistic basis of these interventions remains poorly understood. We decompose refusal steering into component-level interventions across four open-weight models, identifying the sparse subsets of attention a...
This work operationalizes contextual security through four properties that must hold jointly and be evaluated continuously across the agent's trajectory, which changes which defenses are coherent, which evaluations measure something useful, and which attack patterns evaluation can see at all.
Whether an instruction-tuned model calls a tool can be controlled by a single linear direction in its residual stream, extracted without any training from the model's own tool-use preference signal and turned into an inference-time intervention with no prompt change.
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