ax is an open-source analytics harness and agent orchestration tool developed by Necmttn. Designed to operate alongside CLI coding assistants like Claude Code, ax collects, ingests, and analyzes coding agent session telemetry to provide visibility into LLM usage, routing efficiency, and operational costs. In day-to-day use, ax acts as both a CLI utility and an agent enhancement plugin. It stores agent session events locally using an embedded DuckDB backend, enabling engineers to inspect interaction traces, identify candidate savings across model tiers, and run retrospective queries on agent spending without relying on cloud-hosted dashboards. It also supports team-level synchronization of custom skills and reviewer agents via local repository configuration. What sets ax apart is its focus on retrospective repricing, prompt/model routing analytics, and team rig sharing. Rather than functioning simply as another text generation interface, ax measures real-world agent execution paths, quantifies optimization opportunities across model routing strategies, and enforces schema and review guardrails locally. ax is available as open-source software under its GitHub repository. It operates entirely on local infrastructure with zero required network calls for its core data querying pipeline.
Tags: agent harness, ai agent, cli, coding agent, developer tools, OpenSource