Apple's team published a scaling law for tool-use agents, and the recipe is not to generate more tasks
AspireAI community · arXiv (Apple)
*Apple's research team published a scaling law for tool-use agents, and the recipe turns out not to be "generate more tasks."* The SynthAPI pipeline builds synthetic environments and controls their diversity along three axes: which tools exist, which tasks they support, and what state the databases hold. Across 458,752 tasks and 849 trained models of four sizes, the authors derived a law that predicts downstream generalization from the composition of that data rather than its volume.
The finding that matters: as the budget grows, adding tools and databases beats adding more tasks, and more complex tasks help more. Agents trained this way beat prior large-scale tool-use data by 30.5 points on average, and the best per-benchmark baselines by 7.6 to 11.6 points on AppWorld's challenge split.
https://arxiv.org/abs/2610.37648
Read the story and explore more from the AspireAI community.
Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.