One home for every agent.
A free, open-source app to manage all your AI coding agents.
Why • Features • Get Started • Roadmap
Every agent, a different world. Extensions, configs, memory, and rules — scattered across different directories, in different formats, with different conventions.
HarnessKit brings them all under one roof — one native desktop app to see, secure, and manage everything across every agent.
HarnessKit manages all five extension types from a unified interface — Skills, MCP Servers, Plugins, Hooks, and Agent-first CLIs.
| Agent | Skills | MCP | Plugins | Hooks | Agent-first CLIs |
|---|---|---|---|---|---|
| Claude Code | ✓ | ✓ | ✓ | ✓ | ✓ |
| Codex | ✓ | ✓ | ✓ | ✓ | ✓ |
| Gemini CLI | ✓ | ✓ | ✓ | ✓ | ✓ |
| Cursor | ✓ | ✓ | ✓ | ✓ | ✓ |
| Antigravity | ✓ | ✓ | — | — | ✓ |
| Copilot | ✓ | ✓ | ✓ | ✓ | ✓ |
* "—" indicates the agent currently does not support this extension type.
- Smart organization — Filter by type, agent, or source, and search by name. Extensions from the same repo are automatically grouped into packs for batch management.
- Full visibility — Every extension shows its agents, permissions, trust score, and status at a glance. Open the detail panel for per-agent file paths, directory structure, and audit findings.
- Effortless management — Enable or disable right from the list. Check for updates across all extensions with one click.
- Cross-agent deployment — See which agents have the extension and which don't — deploy to any missing agent with one click. HarnessKit handles the format differences between agents (JSON, TOML, hook conventions, MCP schemas) automatically.
extensions-demo.mp4
extensions-demo2.mp4
HarnessKit manages every agent's Configs, Memory, Rules, and Ignore files from one place. Currently supporting 6 agents: Claude Code, Codex, Gemini CLI, Cursor, Antigravity, and Copilot.
- Config file tracking — Automatically discovers every agent's config files — both global and per-project. Add your project directories or custom paths and HarnessKit picks them up alongside the global ones.
- Per-agent dashboard — Each agent gets its own page with all files organized by category, showing scope, path, file size, and a summary of installed extensions. Expand any file to preview its content right in the app.
- Custom paths — Add any file or folder to an agent's dashboard for tracking. Useful for custom configs or scripts that HarnessKit doesn't auto-discover — they show up alongside everything else with the same live preview.
- Real-time detection — The moment a config file is modified, the dashboard reflects it.
agents-demo.mp4
Every extension is scanned by a built-in security engine with 18 static analysis rules and receives a Trust Score (0–100), grouped into three tiers — Safe (80+), Low Risk (60–79), and Needs Review (below 60). A dedicated Audit page lets you search, filter by tier, and drill into every finding.
- One-click audit — Run a full security scan across all extensions with a single click. The dashboard shows how many extensions were scanned and when the last audit ran.
- Precise tracing — Every finding pinpoints the exact file and line number, so you can trace the issue immediately.
- Per-agent scanning — Even if multiple agents share the same extension, each agent's copy is audited independently — because versions can drift, and a safe copy on one agent doesn't guarantee safety on another.
- Permission transparency — Every extension's permissions are surfaced across five dimensions — filesystem paths, network domains, shell commands, database engines, and environment variables. You see exactly what each extension can reach before you decide to keep it.
audit-demo.mp4
Discover, evaluate, and install — three marketplaces in one, each with trending lists and search:
- Skills — Browse and install from the skills.sh registry. Also supports install from Git URL or local directory.
- MCP Servers — Browse the Smithery registry of Model Context Protocol servers.
- Agent-first CLI — Discover CLI tools built specifically for agents — the newest frontier of the agent extension ecosystem.
Every listing shows its description, install count, and source. For skills, you can preview the documentation, check third-party security audit scores before installing, and install to any agent with one click — HarnessKit tracks the source so you always know where each extension came from.
marketplace-demo.mp4
HarnessKit works directly with your agents' native directories instead of copying them into a managed folder — no shadow copies, no sync conflicts.
- Native directories — Reads and writes directly to each agent's own config directory. Your files stay exactly where they are.
- Non-destructive operations — Enabling or disabling an extension is a simple file rename in place. Nothing is moved or duplicated.
- Zero lock-in — Uninstall HarnessKit and everything is exactly where it was. No migration, no cleanup needed.
HarnessKit also ships a standalone command-line interface (hk) for terminal-first workflows, so you can manage extensions without opening the desktop app:
$ hk status
Agents 6 detected (claude · codex · gemini · cursor · antigravity · copilot)
Extensions 136 total (124 skills · 2 mcp · 8 plugins · 1 hooks · 1 clis)
$ hk list --kind skill --agent claude # filter by type and agent
$ hk audit # security audit with trust scores
$ hk enable my-skill # enable by name
$ hk disable --pack owner/repo # batch disable by source- 💡 Tip of the Day — The Overview dashboard surfaces contextual tips for each detected agent from a community-maintained library. Learn shortcuts and best practices as you work.
- 📊 Dynamic Activity Feed — Agent Activity and Recently Installed timelines capture every config change, extension install, and agent event in real time.
- ⚡ Quick Actions — One-click View Agents, Run Audit, Check Updates, and Marketplace access right from the dashboard.
- 🎯 Playful Touches — Smooth animations and micro-interactions throughout the app make daily use feel alive.
- 🎨 Themes — Multiple themes with Light, Dark, and System mode support.
Requirements: macOS 12+, at least one supported AI coding agent installed.
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Download the DMG for your architecture from the latest release:
Chip File Apple Silicon (M1/M2/M3/M4) HarnessKit_x.x.x_aarch64.dmgIntel HarnessKit_x.x.x_x64.dmg -
Open the DMG and drag HarnessKit to the Applications folder.
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Launch HarnessKit. It will automatically detect your installed agents and scan their extensions.
Already installed? Open Settings → Check for Updates to upgrade in-app.
One-line install (auto-detects architecture):
curl -fsSL https://raw.githubusercontent.com/RealZST/HarnessKit/main/install.sh | shOr download the binary manually from the latest release:
| Chip | File |
|---|---|
| Apple Silicon (M1/M2/M3/M4) | hk-macos-arm64 |
| Intel | hk-macos-x64 |
Then install it:
chmod +x hk-macos-arm64 # make it executable (use hk-macos-x64 for Intel)
mv hk-macos-arm64 ~/.local/bin/hk # move to a directory in your PATHAfter installation, restart your terminal and verify with hk status.
- 🤖 More Agents — OpenClaw, Kiro, Cline, Roo Code, Continue, and 20+ additional agents
- 🖥️ Windows & Linux — Cross-platform desktop support
- ⌨️ CLI Enhancements — More commands and richer functionality for
hk
This project is licensed under Apache-2.0.
Artwork (public/icons/ and src/components/shared/agent-mascot/) is All Rights Reserved and is not covered by the Apache-2.0 license.
All product names, logos, and trademarks are property of their respective owners. HarnessKit is an independent project, not affiliated with or endorsed by any agent vendor.