HarnessSync
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Features

A coherent stack across every machine.

HarnessSync replaces the half-day of "set up the new laptop" with one click. The desktop app installs the right CLIs, MCP servers, and editor extensions. Your skills, prompts, and config follow you across machines.

01

Install

Claude Code
Anthropic's official CLI, installed and updated alongside its MCP servers.
Codex CLI
OpenAI's codex CLI plus the toolchains it expects.
Cursor & Aider
Editor + agentic-CLI for those who prefer that workflow.
MCP servers
Filesystem, fetch, GitHub, Linear, Slack – opt in per project.
Portable git + gh
No system git surgery; downloaded lazily on first use.
02

Sync

Skills
Custom skills sync to every machine, identical and versioned.
Slash commands
Your /commands move with you, including project-specific ones.
Hooks
PreToolUse / PostToolUse hooks shared across all your machines.
Prompts & subagents
Long-form prompts, system prompts, and subagent definitions.
Settings.json
Permissions, env vars, and keybindings – same everywhere.
03

Cloud

HarnessSync-managed git
No "where do I put the repo?" – we host it. Your data, encrypted in transit.
Multi-device handoff
Open the laptop, everything's already there.
Storage that scales
100 MB included; +€1/month per 250 MB block.
Quota awareness
Push pauses when you hit the cap. Pull and export keep working.
04

Account

Email + OAuth
Email/password, Google, GitHub. Sanctum-backed sessions for the dashboard.
Per-device tokens
Each machine gets its own token; revoke from the dashboard.
Stripe billing
Cashier-managed subscriptions, EU VAT, invoicing – all standard.
Customer Portal
Cancel, update card, change plan, download invoices – one click.
How it works

Three boxes, two arrows.

Your machines push to a HarnessSync vault and pull from it. The vault is where your skills, prompts, hooks and MCP definitions live. Every CLI on every machine reads from the same place. 

    ┌──────────────────────┐         ┌──────────────────────┐         ┌──────────────────────┐
    │  laptop / desktop    │         │  HarnessSync vault   │         │  laptop / desktop    │
    │                      │         │                      │         │                      │
    │  ~/.claude/          │  push   │   skills/            │  pull   │  ~/.claude/          │
    │  ~/.codex/           │ ──────▶ │   prompts/           │ ──────▶ │  ~/.codex/           │
    │  ~/.cursor/          │         │   hooks/             │         │  ~/.cursor/          │
    │  ~/.opencode/        │  pull   │   mcp/               │  push   │  ~/.opencode/        │
    │  ~/.gemini/          │ ◀────── │   settings.json      │ ◀────── │  ~/.gemini/          │
    └──────────────────────┘         └──────────────────────┘         └──────────────────────┘
              ▲                                  │                                ▲
              │                                  │                                │
              └────────── encrypted in transit ──┴────────── revocable per device ┘

Local-first. Push when you change something. Pull when you want what changed elsewhere. The cloud tier means we host the vault for you – otherwise bring your own git remote.

Comparison

Why not just git?

You can. People do. We did, for a year. Here’s where it stops being free.

  HarnessSync Raw git / dotfiles Mackup / chezmoi Manual sync
Sync across machines ● ● ● ●
Per-CLI awareness ● ○ ○ ○
Skills + hooks + MCP ● ○ ○ ○
Conflict resolution ● ◐ ○ ○
Revoke a single device ● ○ ○ ○
No git knowledge required ● ○ ● ○
Storage included ● ○ ● ○
Encrypted at rest ● ◐ ● ◐
Works without your repo being public ● ● ● ●
Designed for AI tooling ● ○ ○ ○

● yes ◐ partial · needs setup ○ no

Ready to try it?

Create free account → See pricing