The Evolution of Tool Use in LLM Agents: From Single-Tool Call to Multi-Tool Orchestration
Tool use enables large language models (LLMs) to access external information, invoke software systems, and act in digital environments beyond what can be solved from model parameters alone. Early research mainly studied whether a model could select and execute a correct single tool call. As agent systems evolve, however, the central problem has shifted from isolated invocation to multi-tool orchestration over long trajectories with intermediate state, execution feedback, changing environments, and practical constraints such as safety, cost, and verifiability. We comprehensively review recent progress in multi-tool LLM agents and analyzes the state of the art in this rapidly developing are...
| Authors | Haoyuan Xu, Chang Li, Xinyan Ma et al. |
|---|---|
| Primary category | cs.SE |
| Published | 24 March 2026 |
| Last updated at source | 2 April 2026 |
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