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Against tool ecosystems that keep changing underneath them, the strongest agent or harness tested still managed only 42.3 percent task success

AspireAI community · arXiv
Delta-tau-Bench is an executable agent benchmark that models what happens when the tool ecosystem itself moves. Independently evolving services reshape how tasks can be done: familiar tools disappear or get replaced, more efficient alternatives appear with overlapping functionality, and the documentation is noisy. The benchmark holds 1,588 validated multi-turn tasks across 42 domains and six successive ecosystem states, generated through capability-preserving transformations. The headline is the difficulty: even the strongest evaluated model or harness reaches only 42.3% task success, and initial gains from existing skill-learning methods do not consistently convert into better adaptation as the ecosystem evolves. The authors respond with Steward, an ecosystem manager that jointly maintains tools and procedural knowledge through incremental skill updates and dynamic provisioning during execution, which sustains higher task success across ecosystem changes at lower skill-maintenance overhead. The honest limit: the ecosystem states are synthetic transformations, so how much real-world churn looks like this is an open question. https://arxiv.org/abs/2610.34238
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