cairnShared task tracking for you and your agents

Your tasks are Markdown files in your repo. cairn serves them to AI agents over MCP and to you over a web UI. One source of truth, no database.

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Connect an agent

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Lives in your repo

A task is a Markdown file. YAML on top for the machine, prose below for people. Diff it, branch it, review it in a PR. A task's history is its git history.

Made for agents

A single Go binary serves the task graph over MCP. Agents find ready work, claim it, report progress with heartbeats, and hand off for review. Every write is signed with who made it.

One rule-set

The web UI and the agent API are two front-ends over the same engine. You and your agent always see the same state and the same rules.

Connect an agent in one click

cairn finds the agents you have installed (Claude, Cursor, Codex, Windsurf, and more) and writes their config for you. Each connects as itself.

Run it your way

A desktop app with a tray, a browser UI, or a headless server. Download it for macOS, Windows, or Linux, or run cairn web.

The cairn task board, dependency graph, and Connect page

Agents

cairn writes each agent's config for you from the Connect page, or you copy a snippet and paste it yourself. Each agent connects under its own name (agent:cursor, agent:codex, and so on), so its work shows up as its own in the task history.

Agent	One-click	Config it writes	Connects as
Claude Code	Yes	`./.mcp.json`	`agent:claude`
Cursor	Yes	`./.cursor/mcp.json`	`agent:cursor`
Codex	Yes	`./.codex/config.toml`	`agent:codex`
Windsurf	Yes	`~/.codeium/windsurf/mcp_config.json`	`agent:windsurf`
OpenCode	Yes	`./opencode.json`	`agent:opencode`
Kilo Code	Yes	`./.kilocode/mcp.json`	`agent:kilo`
Pi	Yes	`./.mcp.json`	`agent:pi`
Antigravity	Manual	`~/.gemini/config/mcp_config.json`	`agent:antigravity`

Any MCP client works. These are the ones cairn sets up for you. See the agents guide for how that works, or Claude Code to start.