Collapsing Reward, Optimisation, and Persistence in Agents
Collapsing reward, optimisation, and persistence into physical survival embraces reward hacking: any method that gets the reward is a valid adaptation.

Collapsing reward, optimisation, and persistence into physical survival embraces reward hacking: any method that gets the reward is a valid adaptation.

Cherry-picking training data for peak performance can trap agents in dead environments, while sliding window buffers help prevent self-training collapse.

Cherry-picking training data for peak performance deletes behavioural variance and collapses agents; a sliding window buffer preserves generalisation.

Pass@1 fell to zero in our self-training loop while the agents improved: they had learned to use failing first attempts as probes. Why, and what to measure.

Data selection for fine-tuning in a self-training loop: training on the best data collapsed in our 13-generation study, while recent data kept improving.

In our 13-generation continual learning study, top-3 historical generation curation collapsed while a K=3 sliding window SFT buffer adapted on 4x less data.

Why can pass@1 fall to zero while an LLM agent gets better at its task? Our 13-generation SFT study, the probe-then-solve mechanism, and how to detect it.

In a 13-generation agent study, a K=3 sliding window SFT loop retains 52.6% of full-history offline composite score and 58.4% of MB freed on 25% of the rows.