Google Calendar A2A Agent

A production-ready Agent-to-Agent (A2A) that seamlessly integrates with Google Calendar.

Enables AI assistants and automated systems to manage calendar events, schedule meetings, and query availability through a standardized protocol. Built with Go for high performance and reliability, with optional mock mode for testing and development.

Quick Start

# Run the agent
go run main.go

# Or with Docker
docker build -t google-calendar-agent .
docker run -p 8080:8080 google-calendar-agent

Features

• ✅ A2A protocol compliant
• ✅ Google Calendar integration (when configured)
• ✅ Minimal dependencies
• ✅ Production ready
• ✅ Mock mode for testing

Endpoints

• GET /.well-known/agent.json - Agent metadata
• GET /health - Health check
• POST /a2a - A2A protocol endpoint

Configuration

Configure the agent via environment variables:

Core Application Settings

• ENVIRONMENT - Deployment environment (default: dev)
• DEMO_MODE - Enable demo mode with mock services (default: false)

Google Calendar Settings

• GOOGLE_CALENDAR_ID - Target Google Calendar ID (default: primary)
• GOOGLE_CALENDAR_SA_JSON - Google Service Account credentials (JSON format)
• GOOGLE_APPLICATION_CREDENTIALS - Path to Google credentials file (alternative to SA_JSON)
• GOOGLE_CALENDAR_READ_ONLY - Access calendar in read-only mode (default: false)
• GOOGLE_CALENDAR_TIMEZONE - Default timezone for time inputs (default: UTC)

Logging Configuration

• LOG_LEVEL - Log level: debug, info, warn, error (default: info)
• LOG_FORMAT - Log format: json, console (default: json)
• LOG_OUTPUT - Log output: stdout, stderr, or file path (default: stdout)
• LOG_ENABLE_CALLER - Add caller info to logs (default: true)
• LOG_ENABLE_STACKTRACE - Add stacktrace to error logs (default: true)

A2A Agent Configuration (ADK)

Agent Identity

• A2A_AGENT_URL - Agent URL (default: http://helloworld-agent:8080)

Server Configuration

• A2A_DEBUG - Enable debug mode (default: false)
• A2A_TIMEZONE - Timezone for timestamps (default: UTC)
• A2A_STREAMING_STATUS_UPDATE_INTERVAL - Interval for streaming status updates (default: 1s)

LLM Client Configuration

• A2A_AGENT_CLIENT_PROVIDER - LLM provider: openai, anthropic, groq, ollama, deepseek, cohere, cloudflare
• A2A_AGENT_CLIENT_MODEL - Model to use
• A2A_AGENT_CLIENT_API_KEY - API key for LLM provider
• A2A_AGENT_CLIENT_BASE_URL - Custom LLM API endpoint
• A2A_AGENT_CLIENT_TIMEOUT - Timeout for LLM requests (default: 30s)
• A2A_AGENT_CLIENT_MAX_RETRIES - Maximum retries for LLM requests (default: 3)
• A2A_AGENT_CLIENT_MAX_CHAT_COMPLETION_ITERATIONS - Maximum chat completion iterations (default: 10)
• A2A_AGENT_CLIENT_MAX_TOKENS - Maximum tokens for LLM responses (default: 4096)
• A2A_AGENT_CLIENT_TEMPERATURE - Controls randomness of LLM output (default: 0.7)
• A2A_AGENT_CLIENT_TOP_P - Top-p sampling parameter (default: 1.0)
• A2A_AGENT_CLIENT_FREQUENCY_PENALTY - Frequency penalty (default: 0.0)
• A2A_AGENT_CLIENT_PRESENCE_PENALTY - Presence penalty (default: 0.0)
• A2A_AGENT_CLIENT_SYSTEM_PROMPT - System prompt to guide the LLM (default: You are a helpful AI assistant processing an A2A (Agent-to-Agent) task. Please provide helpful and accurate responses.)
• A2A_AGENT_CLIENT_MAX_CONVERSATION_HISTORY - Maximum conversation history per context (default: 20)
• A2A_AGENT_CLIENT_USER_AGENT - User agent string (default: a2a-agent/1.0)

Capabilities Configuration

• A2A_CAPABILITIES_STREAMING - Enable streaming support (default: true)
• A2A_CAPABILITIES_PUSH_NOTIFICATIONS - Enable push notifications (default: true)
• A2A_CAPABILITIES_STATE_TRANSITION_HISTORY - Enable state transition history (default: false)

Authentication Configuration

• A2A_AUTH_ENABLE - Enable OIDC authentication (default: false)
• A2A_AUTH_ISSUER_URL - OIDC issuer URL (default: http://keycloak:8080/realms/inference-gateway-realm)
• A2A_AUTH_CLIENT_ID - OIDC client ID (default: inference-gateway-client)
• A2A_AUTH_CLIENT_SECRET - OIDC client secret

TLS Configuration

• A2A_SERVER_TLS_ENABLE - Enable TLS (default: false)
• A2A_SERVER_TLS_CERT_PATH - Path to TLS certificate file
• A2A_SERVER_TLS_KEY_PATH - Path to TLS private key file

Queue Configuration

• A2A_QUEUE_MAX_SIZE - Queue maximum size (default: 100)
• A2A_QUEUE_CLEANUP_INTERVAL - Queue cleanup interval (default: 30s)

Server Configuration

• A2A_SERVER_PORT - Server port (default: 8080)
• A2A_SERVER_READ_TIMEOUT - Maximum duration for reading requests (default: 120s)
• A2A_SERVER_WRITE_TIMEOUT - Maximum duration for writing responses (default: 120s)
• A2A_SERVER_IDLE_TIMEOUT - Maximum time to wait for next request (default: 120s)
• A2A_SERVER_DISABLE_HEALTHCHECK_LOG - Disable logging for health check requests (default: true)

Telemetry Configuration

• A2A_TELEMETRY_ENABLE - Enable OpenTelemetry metrics collection (default: false)
• A2A_TELEMETRY_METRICS_PORT - Metrics server port (default: 9090)
• A2A_TELEMETRY_METRICS_HOST - Metrics server host
• A2A_TELEMETRY_METRICS_READ_TIMEOUT - Metrics server read timeout (default: 30s)
• A2A_TELEMETRY_METRICS_WRITE_TIMEOUT - Metrics server write timeout (default: 30s)
• A2A_TELEMETRY_METRICS_IDLE_TIMEOUT - Metrics server idle timeout (default: 60s)

Example Usage

For a complete working example with Docker Compose setup, see the example directory.

# Test the agent
curl -X POST http://localhost:8080/a2a \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "message/send",
    "params": {
      "message": {
        "role": "user",
        "content": "List my calendar events for today"
      }
    },
    "id": 1
  }'

License

MIT