Configuration

Config file

All configuration lives in ~/.arx/config.json:

{
  "endpoint": "https://api.synap.ing",
  "api_key": "sk_your_api_key",
  "slug": "your-username"
}

Field	Description	Required
endpoint	ARX server URL	Yes
api_key	Your API key (starts with sk_)	Yes
slug	Your username/tenant slug	Yes

Environment variables

The MCP server also accepts environment variables (override config file):

Variable	Description
ARX_URL	Server endpoint (overrides config)
ARX_API_KEY	API key (overrides config)
ARX_CONFIG	Path to config file (default: ~/.arx/config.json)

Self-hosted endpoint

To point at your own ARX server instead of api.synap.ing:

{
  "endpoint": "http://your-server:9191",
  "api_key": "sk_your_local_key",
  "slug": "admin"
}

See Self-Hosting for server setup instructions.

API key management

Your API key is created during account registration and returned on login. To rotate your key:

1. Log into the Synap dashboard at app.synap.ing
2. Navigate to Settings > API Keys
3. Generate a new key
4. Run npx arx-setup again to update all tools

WARNING

API keys are sensitive credentials. Never commit them to version control or share them publicly.