green-api-mcp-gateway

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MCP gateway for GREEN-API WhatsApp. Lets AI agents (Claude Desktop, OpenClaw, Cursor, and others) send messages, manage instances, and receive notifications via WhatsApp using the Model Context Protocol.

What it does

Send text messages, files by URL, locations, contacts, polls. Forward and edit messages. Manage groups (create, fetch data, add/remove participants). Check phone numbers for WhatsApp, fetch contacts and their info. Get instance state and settings, QR code for authorization. Receive incoming notifications via polling or an HTTP receiver. Partner API for creating/deleting instances. Multi-instance support in a single gateway. Prompt templates for common scenarios (customer support, broadcasts). Prometheus metrics and OpenTelemetry.

Instructions for connecting the MCP server can be found on our website

Architecture

Clean Architecture (Ports & Adapters):

cmd/server/main.go                    — entry point, DI wiring
internal/
  domain/                             — business entities, errors, constants (zero dependencies)
  application/                        — ports (interfaces)
  infrastructure/
    auth.go                           — CredentialManager (in-memory credential store)
    config/config.go                  — YAML + env configuration
    greenapi/client.go                — WhatsApp client via Go SDK
    mcp/
      server.go                       — MCP server (stdio/sse)
      tools.go                        — MCP tools registration
      resources.go                    — MCP resources
      prompts.go                      — MCP prompts
    webhook/
      bridge.go                       — polling bridge
      receiver.go                     — HTTP receiver

Build

go build -o green-api-mcp-gateway ./cmd/server

Requires Go 1.25+.

Transports & endpoints

The server supports four transports, selected via server.transport (or the GREEN_API_TRANSPORT env var):

Transport	Endpoints (relative to host:port)	Use case
stdio	stdin/stdout	Local CLIs (Claude Desktop, Cursor) launching the binary.
sse	GET / (stream) + POST /message	Legacy MCP clients (SSE only).
http	POST/GET /mcp	Streamable HTTP (MCP 2025-03-26+) — preferred for new clients.
hybrid	/sse + /message and /mcp on one port	Public server: serves both legacy SSE and Streamable HTTP.

All HTTP-based transports also expose:

• GET /health, GET /healthz — health probes (no auth)
• GET /favicon.ico, GET /favicon.png — GREEN-API icon

When auth.mode: proxy is enabled, the OAuth 2.0 PKCE endpoints are added too:

• GET /.well-known/oauth-authorization-server — RFC 8414 metadata
• GET /.well-known/oauth-protected-resource — RFC 9728 metadata
• GET /authorize — browser-facing authorization form
• POST /token — token exchange

Configuration

Via YAML

server:
  transport: stdio   # stdio | sse | http | hybrid
  port: 8090

auth:
  mode: config       # config | proxy
  cache_ttl: 300     # seconds (proxy mode only)

green_api:
  instances:
    - id: 1101000001
      api_token: "YOUR_TOKEN"
      api_url: "https://api.green-api.com"

webhook:
  mode: polling
  polling_timeout: 20

rate_limit:
  requests_per_second: 10
  burst: 20

logging:
  level: info
  format: text

Via environment variables

Environment variables take precedence over the YAML config:

The variables below cover both deployment modes. Credentials variables (GREEN_API_INSTANCE_ID, GREEN_API_TOKEN, GREEN_API_URL) apply only to local stdio runs with auth.mode: config. For HTTP transports (sse on /sse + /message, http on /mcp, or hybrid) use auth.mode: proxy instead — credentials arrive in HTTP headers or via the built-in OAuth flow and the env credentials are ignored.

• GREEN_API_INSTANCE_ID — instance ID
• GREEN_API_TOKEN — API token
• GREEN_API_URL — API base URL (defaults to https://api.green-api.com)
• GREEN_API_TRANSPORT — transport: stdio, sse, http, or hybrid
• GREEN_API_PORT — HTTP port (defaults to 8090)
• GREEN_API_BASE_URL — public base URL (used for OAuth issuer/redirects, e.g. https://mcp.example.com)
• GREEN_API_WIDGET_DOMAIN — unique widget origin for ChatGPT Apps submission metadata (defaults to GREEN_API_BASE_URL, then https://mcp.green-api.com)
• GREEN_API_AUTH_MODE — config or proxy
• GREEN_API_AUTH_CACHE_TTL — proxy-auth credential cache TTL (seconds)
• GREEN_API_WEBHOOK_MODE — polling or receiver
• LOG_LEVEL — log level
• LOG_FORMAT — text or json

Run

# With environment variables
export GREEN_API_INSTANCE_ID=1101000001
export GREEN_API_TOKEN=your_token
./green-api-mcp-gateway

# With a config file
./green-api-mcp-gateway --config config.yaml

Integration

Claude Desktop (local stdio)

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "whatsapp": {
      "command": "/path/to/green-api-mcp-gateway",
      "args": ["--config", "/path/to/config.yaml"]
    }
  }
}

OpenClaw

mcp:
  servers:
    - name: whatsapp
      command: /path/to/green-api-mcp-gateway
      args: ["--config", "/path/to/config.yaml"]

Docker

docker build -t green-api-mcp-gateway .

docker run --rm -i \
  -e GREEN_API_INSTANCE_ID=1101000001 \
  -e GREEN_API_TOKEN=your_token \
  green-api-mcp-gateway

MCP Tools

Messaging

Link to documentation

• whatsapp_send_message — text message
• whatsapp_send_file — file by URL
• whatsapp_send_location — location
• whatsapp_send_contact — contact (vCard)
• whatsapp_send_poll — poll
• whatsapp_forward_messages — forward
• whatsapp_edit_message — edit
• whatsapp_delete_message — delete

Instance

Link to documentation

• whatsapp_get_state — authorization state
• whatsapp_get_settings — current settings
• whatsapp_set_settings — update settings
• whatsapp_get_qr — authorization QR code
• whatsapp_connect — connect instance
• whatsapp_disconnect — disconnect instance

Contacts

Link to documentation

• whatsapp_get_contacts — contact list
• whatsapp_get_contact_info — contact information
• whatsapp_check_whatsapp — phone number check

Groups

Link to documentation

• whatsapp_create_group — create a group
• whatsapp_get_group_data — group data
• whatsapp_add_group_participant — add a participant
• whatsapp_remove_group_participant — remove a participant
• whatsapp_leave_group — leave a group

Notifications

Link to documentation

• whatsapp_receive_notification — receive an incoming notification (long-poll)

Partner API

Link to documentation

• whatsapp_create_instance — create an instance
• whatsapp_delete_instance — delete an instance
• whatsapp_get_instances — list instances

MCP Resources

• whatsapp://instance/{id}/state — instance state
• whatsapp://instance/{id}/settings — instance settings

MCP Prompts

• whatsapp_customer_support — template for customer support
• whatsapp_broadcast — template for broadcast messaging

Dependencies

• mcp-go — MCP SDK
• whatsapp-api-client-golang — GREEN-API Go SDK

Development

go test ./...
gofmt -w .
GOOS=linux GOARCH=amd64 go build -o green-api-mcp-gateway-linux ./cmd/server

License

MIT — see LICENSE.