Tool-Output Pruning

Compressing tool outputs at the agent-environment boundary before they enter history — SWE-Pruner Pro shows the keep-or-prune signal is already inside the coding agent's own backbone (linear probe AUC 0.83), so an 18M-parameter head riding the existing prefill replaces the separate scoring model: up to 39% fewer end-to-end tokens at held quality and the only one of seven pruners that never inflates tokens, at ~15% added wall time — but on SWE-Bench Verified every pruner raised input tokens on one backbone and lost resolves on the other