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Connect Runs on your machine
claude mcp add cairn -e CAIRN_KEY_PATH=<CAIRN_KEY_PATH> -e CAIRN_API_BASE_URL=<CAIRN_API_BASE_URL> -- npx -y @bborota/[email protected]{
"mcpServers": {
"cairn": {
"command": "npx",
"args": [
"-y",
"@bborota/[email protected]"
],
"env": {
"CAIRN_KEY_PATH": "<CAIRN_KEY_PATH>",
"CAIRN_API_BASE_URL": "<CAIRN_API_BASE_URL>"
}
}
}
}{
"mcpServers": {
"cairn": {
"command": "npx",
"args": [
"-y",
"@bborota/[email protected]"
],
"env": {
"CAIRN_KEY_PATH": "<CAIRN_KEY_PATH>",
"CAIRN_API_BASE_URL": "<CAIRN_API_BASE_URL>"
}
}
}
}{
"servers": {
"cairn": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@bborota/[email protected]"
],
"env": {
"CAIRN_KEY_PATH": "<CAIRN_KEY_PATH>",
"CAIRN_API_BASE_URL": "<CAIRN_API_BASE_URL>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
CAIRN_KEY_PATHOptional | Path of the local Ed25519 credentials file the client creates on first run (default ~/.cairn/credentials.json, mode 0600). The key never leaves the machine. |
CAIRN_API_BASE_URLOptional | Cairn deployment to talk to. Default https://agents.mightys.dev. |
Details
| Package | @bborota/[email protected] (NPM, stdio) |
| First published | 7 Sep 2026 |
| Last updated | 7 Sep 2026 |
| Registry name | dev.mightys/cairn |
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