PCBRouteAgent: How Close Are LLM Agents to Becoming PCB Routing Engineers?
PCBRouteAgent: How Close Are LLM Agents to Becoming PCB Routing Engineers?
PCBRouteAgent achieves 100%, 94.9%, 100%, and 40% D2, D3-A, D3-B, D3-C cleanliness pass rates on 247 synthetic and real PCBs, being 13.9, 36, and 10 percentage points higher than the best baseline on three real-world subsets respectively.
Published on Nov 5
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Abstract
Automating printed circuit board (PCB) routing requires coordinating board-level connectivity decisions with geometric execution under strict design rules. Although recent agents can interact with native routing tools, reliable routing on complex boards remains challenging. We present PCBRouteAgent, a multimodal PCB routing agent inspired by how human engineers coordinate global strategy with local execution. A Global Routing Planner combines board images and structured electrical and geometric information to specify connection topology, routing order, corridors, and layer transitions. A Detailed Routing Executor realizes these guides through KiCad's native routing engine and performs bounded local recovery. Unresolved failures are returned as structured feedback, enabling targeted guide revisions while preserving accepted routes. We evaluate PCBRouteAgent on 247 synthetic and real-world boards from four PCBWorld-Bench test splits. It achieves clean-pass rates of 100%, 94.9%, 100%, and 40% on D2, D3-A, D3-B, and D3-C, respectively. On the three real-world subsets, PCBRouteAgent outperforms the best evaluated baseline in clean-pass rate by 13.9, 36, and 10 percentage points, respectively.
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