Spike-Killer: Evidence-Gated LLM Assistance for Safe Performance Diagnosis on a Real Windows Workstation

Abstract

LLM-assisted agents can synthesize system evidence, propose configuration changes, and automate diagnostic tasks, but their flexibility makes an imprecise action or an intrusive collector an operational risk. We present Spike-Killer, a human-approved workflow for diagnosing frame-time complaints on one real Windows workstation. The workflow treats each action as an evidence-gated transaction: it records the exact target state, classifies risk, preserves a snapshot, verifies a postcondition, and retains failed measurements as first-class evidence. This experience paper reports a completed same-day study with Counter-Strike 2 as a demanding target application. The evidence bundle contains preserved state snapshots, exploratory microbenchmarks, a ten-run same-state repeatability probe, live telemetry, a repaired over-broad registry action, incompatible presentation-capture attempts, an invalid local replay, and a system-level tracing replacement. Windows Performance Recorder produced two CS2 local-Bot GPU traces of 90.69 and 85.85 seconds; both were attributed to cs2.exe, exposed DxgKrnl Present metadata, and had zero lost ETW buffers or events. These results qualify trace integrity, not performance: the study reports no frame intervals, P99 estimate, or intervention effect. The contribution is an auditable, human-in-the-loop pattern for trustworthy agent assistance on a real workstation, including explicit stop conditions when evidence is insufficient.