ACE-Engineering

Ace Sidecar — Productivity skill for Claude Code

Productivity community

Local developer observability sidecar, transcript mining, and workflow skill miner for Claude Code & Antigravity.

How to install Ace Sidecar

This entry records only its repository, not the path inside it, so there is no exact command to give. Open ACE-Engineering/ace-sidecar and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Ace Sidecar does

Local developer observability sidecar, transcript mining, and workflow skill miner for Claude Code & Antigravity.

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README

ACE Sidecar

Local developer observability for AI coding agents — see what your Claude Code, Antigravity, and OpenAI Codex sessions actually cost.

[![CI](https://github.com/ACE-Engineering/ace-sidecar/actions/workflows/ci.yml/badge.svg)](https://github.com/ACE-Engineering/ace-sidecar/actions/workflows/ci.yml) [![PyPI](https://img.shields.io/pypi/v/ace-sidecar.svg)](https://pypi.org/project/ace-sidecar/) [![Python](https://img.shields.io/pypi/pyversions/ace-sidecar.svg)](https://pypi.org/project/ace-sidecar/) [![License](https://img.shields.io/badge/License-AGPL_3.0-blue.svg)](LICENSE)

![ACE Sidecar dashboard](docs/assets/dashboard_preview.jpg)

**[What it does](#what-it-does)** · **[Requirements](#requirements)** · **[Install](#install)** · **[Check Version](#check-version)** · **[Upgrade](#upgrade)** · **[Quickstart](#quickstart)** · **[Features](#features)** · **[Who builds this](#who-builds-this)** · **[Configuration](#configuration)** · **[Endpoints](#endpoints)** · **[Development](#development)** · **[License](#license)**

What it does

ACE Sidecar runs a proxy on your machine in front of model providers, recording what each turn costs — tokens in and out, what came from cache, how long you waited. It automatically reads your existing local transcripts (`~/.claude/projects`, `~/.gemini/antigravity/brain`, `~/.codex/sessions`), providing unified history and cost tracking from the first run.

Nothing leaves your machine: no account, no upload. Metrics live in a local SQLite file you can delete anytime.

Built by [ACE Fleet](https://acefleet.dev) — see [Who builds this](#who-builds-this).

Requirements

Python 3.12+ — the one hard requirement. Check with python3 --version.
macOS, Linux, or Windows. No admin rights needed.
A coding agent you already use. Claude Code, Google Antigravity, and OpenAI Codex are supported. However you pay for it — subscription or API key — is how it stays paid; the sidecar adds no account of its own.