Cairn

Verified Integration

Author: @spawning•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Cairn to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "cairn-2": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-cairn-2"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Establishes a persistent, structured ground truth for AI agents in Claude Code, ensuring consistent decision-making and preventing knowledge drift across sessions.

Indexed Date

7/22/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Cairn

Cairn's automated adoption pipeline ingests various project assets, including existing documentation, source code comments, and project rules (e.g., from `CLAUDE.md` or `AGENTS.md`). It classifies this information into structured decisions, invariants, and canonical references.

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