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GhostShell: Streaming LLM Function Calls for Concurrent Embodied Programming

We present GhostShell, a novel approach that leverages Large Language Models (LLMs) to enable streaming and concurrent behavioral programming for embodied systems. In contrast to conventional methods that rely on pre-scheduled action sequences or behavior trees, GhostShell drives embodied systems to act on-the-fly by issuing function calls incrementally as tokens are streamed from the LLM. GhostShell features a streaming XML function token parser, a dynamic function interface mapper, and a multi-channel scheduler that orchestrates intra-channel synchronous and inter-channel asynchronous function calls, thereby coordinating serial-parallel embodied actions across multiple robotic components under LLM guidance. We evaluate GhostShell on our robotic prototype COCO through comprehensive grounded experiments across 34 real-world interaction tasks and multiple LLM backends. The results demonstrate that our approach achieves a state-of-the-art Behavioral Correctness Metric of 0.85 with Claude-4-Sonnet, and up to 66X faster response times compared to native LLM function calling APIs. GhostShell also proves effective in long-horizon multimodal tasks, exhibiting strong robustness and generalization capabilities.

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