Embrace LLM-Based Cognitive Architecture to Boost Team Problem-Solving in Open-Ended Tasks

Open-ended, team-based problem solving demands (i) a bridge between stochastic language models and symbolic control, (ii) mechanisms for idea elaboration, (iii) feature-level concept combination, and (iv) internal representations that support understanding beyond mere association. We present a cognitive architecture (CA) that couples an LLM with an editable knowledge-graph (KG) scaffold and a controller that adaptively schedules five reasoning strategies. Elaborations are cast as graph updates validated against coverage and consistency checks; combinations produce property- and relation-level recompositions. On 30 collaborative programming dialogs (nine representative scenarios), adaptive prompting improves solution completeness by 19.1% and reduces required turns by 18.5% over a CoT baseline; explicit concept combinations increase Distinct-3 by 12.4 points with a +0.7 gain in human-rated creativity. Ablations show that Soft→Pruning scaffolds best support early elaboration, while Hard partitioning helps under ambiguity. The CA demonstrates a practical route to aligning LLMs with team intent in open-ended tasks.