ToolForge: A Data Synthesis Pipeline for Multi-Hop Search without Real-World APIs

• URL: http://arxiv.org/abs/2512.16149v1
• Date: Thu, 18 Dec 2025 04:06:26 GMT
• Title: ToolForge: A Data Synthesis Pipeline for Multi-Hop Search without Real-World APIs
• Authors: Hao Chen, Zhexin Hu, Jiajun Chai, Haocheng Yang, Hang He, Xiaohan Wang, Wei Lin, Luhang Wang, Guojun Yin, Zhuofeng zhao,
• Abstract summary: We introduce ToolForge, an automated synthesis framework that achieves strong real-world tool-calling performance.<n>ToolForge synthesizes large-scale tool-learning data specifically designed for multi-hop search scenarios.<n> Empirical results show that a model with only 8B parameters, when trained on our synthesized data, outperforms GPT-4o on multiple benchmarks.
• Score: 40.70833390513187
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Training LLMs to invoke tools and leverage retrieved information necessitates high-quality, diverse data. However, existing pipelines for synthetic data generation often rely on tens of thousands of real API calls to enhance generalization, incurring prohibitive costs while lacking multi-hop reasoning and self-reflection. To address these limitations, we introduce ToolForge, an automated synthesis framework that achieves strong real-world tool-calling performance by constructing only a small number of virtual tools, eliminating the need for real API calls. ToolForge leverages a (question, golden context, answer) triple to synthesize large-scale tool-learning data specifically designed for multi-hop search scenarios, further enriching the generated data through multi-hop reasoning and self-reflection mechanisms. To ensure data fidelity, we employ a Multi-Layer Validation Framework that integrates both rule-based and model-based assessments. Empirical results show that a model with only 8B parameters, when trained on our synthesized data, outperforms GPT-4o on multiple benchmarks. Our code and dataset are publicly available at https://github.com/Buycar-arb/ToolForge .

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