🔥 FastContext: Training Efficient Repository Explorer for Coding Agents

💡 The paper introduces FastContext, a dedicated exploration subagent designed to improve the efficiency of repository exploration in large language model coding agents. The problem addressed is that repository exploration is a major bottleneck in coding agents, consuming a substantial token budget and polluting the agent's context with irrelevant code snippets.

The method involves separating repository exploration from code solving using specialized exploration models. FastContext is invoked on demand and issues parallel tool calls to return concise file paths and line ranges as focused context. The exploration models used in FastContext are powered by 4B-30B parameters and are bootstrapped from strong reference-model trajectories. They are then refined with task-grounded rewards for broad first-turn search, multi-turn evidence gathering, and precise citation generation.

The results show that integrating FastContext into a coding agent improves end-to-end resolution rates by up to 5.5 percent while reducing coding-agent token consumption by up to 60 percent, with minimal overhead. The paper demonstrates that repository exploration can be effectively handled by specialized models, separate from the code solving process. The code and data for FastContext are made available, allowing for further research and development in this area. Overall, the paper presents a significant contribution to the field of coding agents and software engineering, providing a more efficient and effective approach to repository exploration.

📅 Published on Jun 12

🔗 Links:
• GitHub: https://github.com/huggingface
• arXiv: https://arxiv.org/abs/2606.14066
• PDF: https://arxiv.org/pdf/2606.14066
• Project Page: https://huggingface.co/microsoft/FastContext-1.0-4B-SFT

🤖 Models citing this paper:
• https://huggingface.co/microsoft/FastContext-1.0-4B-SFT
• https://huggingface.co/microsoft/FastContext-1.0-4B-RL

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📢 By: https://xn--r1a.website/PaperNexus

#EfficientRepositoryExploration #CodingAgents #LargeLanguageModels #RepositoryExplorationSubagents #SpecializedExplorationModels