Reference

Environment Variables

All environment variables read by MCPLab.

Provider API Keys

ANTHROPIC_API_KEY — required when using provider: anthropic.
OPENAI_API_KEY — required when using provider: openai.
AZURE_OPENAI_API_KEY — required when using provider: azure.
AZURE_OPENAI_ENDPOINT — required when using provider: azure. Full resource URL.
AZURE_OPENAI_DEPLOYMENT — required when using provider: azure. Deployment name.

Anthropic .env

ANTHROPIC_API_KEY=sk-ant-api03-...

OpenAI .env

OPENAI_API_KEY=sk-proj-...

Azure OpenAI .env

AZURE_OPENAI_API_KEY=your-azure-key
AZURE_OPENAI_ENDPOINT=https://your-resource.openai.azure.com
AZURE_OPENAI_DEPLOYMENT=your-deployment-name

Bearer Token References

Any environment variable name can be used as a bearer token reference in a server definition. The variable name (without the $ prefix) is looked up at runtime.

example

servers:
  - id: my-server
    transport: http
    url: https://api.example.com/mcp
    token: $MY_SERVER_TOKEN   # reads process.env.MY_SERVER_TOKEN