Challenge: a number of tools are used to perform complex tasks, but the tool utilization process can cause errors.
Approach: They propose a critique evaluation benchmark for tool learning that analyzes function-calling errors on tool evaluation benchmarks.
Outcome: The proposed critique evaluation benchmark holds diverse tool-use errors with varying complexities, which better reflects real-world scenarios.

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CriticBench: Benchmarking LLMs for Critique-Correct Reasoning (2024.findings-acl)

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Challenge: CriticBench is a benchmark designed to assess LLMs’ abilities to critique and refine their reasoning across a variety of tasks.
Approach: They propose a benchmark to assess LLMs' ability to critique and correct reasoning across a variety of tasks.
Outcome: The proposed benchmark examines the performance of 17 large language models in generation, critique, and correction reasoning.
Do LLMs Catch Their Own Mistakes? A Comprehensive Benchmark for Reflective Tool Use LLMs (2026.findings-acl)

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Challenge: Existing benchmarks primarily evaluate planning and execution success, overlooking the self-reflective dimension of tool use.
Approach: They propose a benchmark to assess LLMs’ self-reflective reasoning in tool-augmented multi-turn dialogues.
Outcome: The proposed benchmark covers 10 domains with 88 distinct APIs and 968 annotated dialogues, systematically injecting diverse error types arising from both user and assistant behavior.
ACEBench: A Comprehensive Evaluation of LLM Tool Usage (2025.findings-emnlp)

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Challenge: Existing benchmarks for evaluating LLMs’ tool usage face several limitations: limited evaluation scenarios, lacking assessments in real multi-turn dialogue contexts; narrow evaluation dimensions, with insufficient detailed assessments of how LLM use tools; and reliance on LLM or real API executions for evaluation, which introduces significant overhead.
Approach: ACEBench is a benchmark for evaluating tool usage in Large Language Models . it categorizes data into three primary types based on evaluation methodology: Normal, Special, and Agent.
Outcome: ACEBench categorizes data into three primary types based on evaluation methodology: Normal, Special, and Agent.
NesTools: A Dataset for Evaluating Nested Tool Learning Abilities of Large Language Models (2025.coling-main)

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Challenge: Existing benchmarks on nested tool learning are lacking relevant data instances.
Approach: They propose a method to construct large-scale nested tool calls with different nesting structures using a large-quality dataset.
Outcome: The proposed method can be used to evaluate the nested tool learning abilities of large language models (LLMs) in real-world applications.
Meta-Tool: Unleash Open-World Function Calling Capabilities of General-Purpose Large Language Models (2025.acl-long)

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Challenge: Large language models struggle with addressing diverse user inquiries in open-world tasks.
Approach: They propose a plug-and-play tool retrieval system for LLMs to access external tool library and use retrieved tools to solve user's problem.
Outcome: The proposed model improves on a finetuned version of LLaMA-3.1 and 2,800 dialogues and 7,361 tools spanning ten distinct test categories.
Planning, Creation, Usage: Benchmarking LLMs for Comprehensive Tool Utilization in Real-World Complex Scenarios (2024.findings-acl)

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Challenge: Existing benchmarks focus on simple synthesized queries that do not reflect real-world complexity, thereby offering limited perspectives in evaluating tool utilization.
Approach: They propose a benchmark to evaluate LLMs’ ability in tool utilization within real-world scenarios.
Outcome: The proposed benchmark improves LLMs’ ability in tool utilization within real-world scenarios and eliminates the restriction of pre-defined toolset.
Feedback-Driven Tool-Use Improvements in Large Language Models via Automated Build Environments (2026.findings-acl)

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Challenge: Currently, there are no efficient reinforcement learning (RL) frameworks specifically designed for tool use.
Approach: They propose an automated environment construction pipeline that incorporates scenario decomposition, document generation, function integration, complexity scaling, and localized deployment to enable high-quality training environments without external tools.
Outcome: The proposed framework significantly improves the models’ tool-use performance without degrading their general capabilities.
ToolSword: Unveiling Safety Issues of Large Language Models in Tool Learning Across Three Stages (2024.acl-long)

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Challenge: Existing research focuses on enhancing LLMs capabilities through tool utilization.
Approach: They propose a framework to investigate safety issues in large language models in tool learning . they propose malicious queries and jailbreak attacks in the input stage .
Outcome: The proposed framework investigates six safety scenarios for LLMs in tool learning . the data will be released upon acceptance of the proposed framework .
T-Eval: Evaluating the Tool Utilization Capability of Large Language Models Step by Step (2024.acl-long)

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Challenge: Existing studies evaluate the tool utilization ability of large language models based on the final output or only consider the single-step tool calling.
Approach: They propose a new approach to evaluate the tool utilization capability of large language models (LLMs) they decompose the tool usage into multiple sub-processes, including instruction following, planning, reasoning, retrieval, understanding, and review.
Outcome: The proposed model exhibits consistency with the outcome-oriented evaluation and provides a more fine-grained analysis of the capabilities of LLMs.
Lost in Execution: On the Multilingual Robustness of Tool Calling in Large Language Models (2026.acl-long)

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Challenge: Large Language Models (LLMs) are increasingly deployed as agents that invoke external tools through structured function calls.
Approach: They introduce a diagnostic benchmark and conduct a systematic evaluation of multilingual tool calling across Chinese, Hindi, and the low-resource language Igbo.
Outcome: The proposed benchmarks show that multilingual tool calling fails despite correct intent understanding and tool selection.

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