Persistent coding-agent bots
Create persistent named bots with their own agent backend, project folder, instructions, memory and permission policy. Each bot keeps a main chat and can have reply threads.
Codync
Codync is an open-source developer tool that turns coding agents such as Claude Code, Codex, Cursor and Gemini into persistent bots you can message from iPhone, Mac, Linux or a terminal. It runs a Rust host on macOS or Linux and supports remote access, approvals, group chats and bot-to-bot collaboration.
Messaging interface for coding agents
Codync is an open-source tool for messaging coding agents as persistent bots. Its Rust-based codync-host runs on a Mac or Linux computer, drives supported agent harnesses, stores conversations, and serves connected clients. Instead of opening a particular development session, a user chooses a named bot, sends an instruction, and receives a notification when the bot finishes or needs approval.
The product is designed for remote and multi-agent workflows. iPhone, macOS, Linux and terminal clients can use the same host, while computers can be reached directly or through an encrypted relay. Bots can work independently in separate project folders, participate in group chats, or request help from one another without merging their sessions or permission settings.
Core features
Native clients across devices
Use SwiftUI clients on iPhone and macOS, a GTK 4/libadwaita client on Linux, or the terminal UI over SSH. Chats and bots are served by the same host.
Remote access without port forwarding
Connect an iPhone to a computer directly on the same network or through the included Cloudflare relay. The relay forwards end-to-end encrypted ciphertext, and the system can also use Tailscale or local connections.
Bot groups and delegation
Put multiple bots in a group chat, mention specific participants, and let bots ask other visible bots for a response through the built-in team MCP server. Requests retain separate folders, sessions and approval policies.
Approvals and mobile notifications
Receive approval cards and notifications when a bot needs attention or finishes. The iPhone app also provides Live Activity, widgets, remote screen access over WebRTC, and voice calls with spoken replies.
ACP-based host and transcript continuity
Use the Agent Client Protocol to communicate with supported harnesses. The Rust host stores transcripts in SQLite and tracks revisions so reconnecting clients can catch up without missing changes.
Practical use cases
Remote task delegation
Send a task from an iPhone while away from the desk, then review an approval card or completion notification instead of reopening a local development session.
Parallel project work
Assign separate bots to different project folders or roles, such as implementation and review, while keeping each bot's tools, transcript and permission policy independent.
Multi-agent team channels
Place several agents in a group chat, mention the one needed for a turn, and use threads to explore a related task without filling the main conversation with side discussion.
Agent-to-agent review
Ask one bot to have another inspect changes or provide a review. The request and outcome remain visible in the relevant chats, while the recipient works with its own folder and approvals.
Server and SSH workflows
Connect to a headless Mac, Linux server or cloud VM from a supported client, or use the terminal UI over SSH when a graphical app is not available.
Pros and Cons
Pros
- Open-source, MIT-licensed software with no Codync subscription or paid tier stated in the repository.
- Supports multiple coding-agent backends and automatically detects installed agents.
- Provides native iPhone, macOS and Linux clients plus a terminal interface over SSH.
- Supports persistent bots, separate project and permission contexts, group chats, threads and bot-to-bot requests.
- Includes remote connectivity, approval notifications, remote screen access and voice interaction in the described clients.
Cons
- The host runs on macOS or Linux; the supplied source does not describe a native Windows host.
- Remote workflows depend on configuring the host, client pairing and the relevant coding-agent installations or accounts.
- Agent behavior and available capabilities can vary by ACP backend and local harness.
FAQ
How is Codync set up?
Codync runs a Rust host called codync-host on macOS or Linux. It discovers installed coding-agent harnesses, while clients connect through the local network, an encrypted direct or relay connection, or SSH for terminal access. The repository provides a one-line installation command for macOS and Linux.
Which coding agents can Codync use?
The host supports agents including Claude Code, Codex, Cursor, Gemini, Copilot, OpenCode, Pi and Grok Build, plus other agents in the official ACP registry. Installed agents are detected automatically; registry agents can be fetched on first use. The source does not claim that every listed agent has identical capabilities.
How does a Codync bot relate to a coding agent?
A bot has a name, avatar, instructions, agent backend, project folder and permission policy. You message it from an iPhone, Mac, Linux desktop or terminal, and it runs the assigned agent on the computer hosting that bot.
Can multiple bots collaborate?
Yes. Multiple bots can run side by side, and group chats can include several bots. You can mention a bot to select it, start threads from messages, or ask one bot to request help from another through the built-in team MCP server.
Which platforms are supported?
The host runs on macOS and Linux. Native clients are provided for iPhone, macOS and Linux, and a terminal interface can be used locally or over SSH. The source does not describe a native Windows host.
Quick Facts
- Category
- Developer Tool
- License
- MIT
- Host
- Rust codync-host on macOS and Linux
- Clients
- iPhone, macOS, Linux and terminal
- Agent protocol
- Agent Client Protocol (ACP)
- Pricing
- Repository states free, open source and no subscription or paid tier
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