Inspect AI agent traces. Find suspicious steps. Compare runs. HarnessForge Studio is a local-first AI agent trace inspector and debugger for recorded JSON, JSONL, and NDJSON traces. Import a trace, map its fields, reconstruct the timeline, and inspect what happened step by step. HarnessForge helps you review: Tool calls and results Messages and events Tokens and estimated costs Timing and durations Repetition, loops, and suspicious patterns Potentially sensitive values Differences between two runs You can compare Run A with Run B, add notes and bookmarks, and export a debugging report for further review. Local-first and private HarnessForge Studio runs entirely in your browser. Imported traces stay on your device and are not uploaded. There is no account, cloud storage, analytics, telemetry, or external API. Analysis is advisory. HarnessForge highlights patterns worth inspecting; it does not determine the true root cause of an AI failure, reproduce models, or guarantee support for every trace format. What you get One self-contained HTML application One-time purchase No subscription No account No cloud service No customer-support or maintenance commitment Finished downloadable product Price: $49