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LLM Agents Already Know When to Call Tools - Even Without Reasoning
When2Tool finds LLMs linearly encode tool necessity in hidden states, and Probe&Prefill uses this to cut unnecessary tool calls by 48% with minimal accuracy loss.
Sydney Poster Session 5, Thu, Dec 10, 10:00 AM–1:00 PM, Hall 1-4 · Published 2026 · ▲ 2 on Hugging Face · Code ★ 16
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AI panel: 18 of 20 reviewers recommend it
lenient 5/5
medium 9/10
strict 4/5