Harness Engineering in LLM Tool Use via Agent-Native Reusable Tool Primitives
3.80T1 sourcearXiv cs.MA
Source record
Published by arXiv cs.MA (T1 source). The original is at https://arxiv.org/abs/2609.01736.
Pipeline notes
The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.
SummaryPaper introduces Tool Primitives, wrapping tools with LLM interfaces that use natural language instead of rigid API schemas. It presents ToolFace (a 25,519-function repository with dynamic retrieval) and HEART, a Planner-Router-Verifier framework. HEART reportedly outperforms SFT models by 10% and frontier models by 6% on average, with 84% completion on 50 real-world tasks and up to 85% lower API cost.
Why it mattersConcrete agent tool-orchestration architecture with benchmark results against frontier models. The natural-language-as-tool-interface idea is a notable design choice worth examining for agent stack builders.
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