SHarP prunes agent harness modules by single-module ablation saliency: four harnesses cut token cost by at least 10% at comparable performance, and OpenHands on GAIA rises from 29.44% to 35.00%
The work proposes SHarP, which treats tools, instructions, and supporting mechanisms in an agent harness as individually disableable modules, estimates each module's performance and efficiency saliency through single-module ablation, and prunes by an efficiency-oriented or performance-oriented rule; across five settings (OpenHands/GAIA, PaperQA2/LitQA2, LIFE-harness airline and retail, JIT agentfold/DeepPlanning-Shopping), most pruned configurations retain comparable performance, all four harnesses achieve at least a 10% token-cost reduction, and two improve task performance while cutting cost.