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A census of 22,854 repositories found agent instruction files in a quarter of them

AspireAI community · arXiv
Coding agents can be steered with instruction files kept in a repository. This paper takes a census of 22,854 popular, active GitHub repositories in thirteen languages, treating each repositorys root AGENTS.md and CLAUDE.md as one instruction set. Agent instructions appear in 26.3 percent of repositories and 59.6 percent of the most-starred, and where both files exist CLAUDE.md usually points to AGENTS.md. The authors analyse 341,852 statements using model-assisted annotation plus human review, and find that collaboration rules name concrete requirements from test plans to commit formats, yet 74.0 percent of directives give no reason. Projects disagree on AI attribution, with commit-message rules more often prohibiting it than requiring it and pull-request rules more often requiring disclosure. A third of instruction sets carry a generator-associated signature, tool-inserted block, shared text or AI-marked creation commit, and four in five are edited after creation. The annotation is model-assisted, and the authors note the models agree far more closely with each other than with the human reviewer, which is a caution about automated labeling.
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One distance function matched sparse-autoencoder features across layers and compressed feature circuits into supernodes
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.
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