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Vonage MCP Integration for LangGraph

Connect Vonage to LangGraph through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

7 functions 6 read 1 write API key auth
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Connect Vonage to LangGraph

Run KosmoKrator integration calls from LangGraph nodes while preserving local credentials and permissions.

Use a graph node that calls the KosmoKrator CLI for deterministic steps or an MCP client for dynamic tool selection. The gateway is local, scoped to this integration, and starts with --write=deny so LangGraph can inspect read-capable tools without receiving write access by default.

Vonage MCP Config for LangGraph

Headless CLI calls fit repeatable graph edges; MCP fits exploratory agent nodes.

{
  "mcpServers": {
    "kosmokrator-vonage": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=vonage",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=vonage --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Vonage instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Vonage Tools Visible to LangGraph

LangGraph sees stable MCP tool names generated from the Vonage integration catalog.

MCP toolSource functionTypeDescription
integration__vonage__vonage_get_account_balance vonage.vonage_get_account_balance Read Get the current balance of your Vonage account.
integration__vonage__vonage_list_applications vonage.vonage_list_applications Read List Vonage applications configured on your account. Applications define how Vonage handles calls and messages.
integration__vonage__vonage_list_messages vonage.vonage_list_messages Read Search and list SMS messages from your Vonage account. Requires a date in YYYY-MM-DD format. Optionally filter by recipient number.
integration__vonage__vonage_list_numbers vonage.vonage_list_numbers Read List phone numbers purchased on your Vonage account. Optionally filter by pattern.
integration__vonage__vonage_send_sms vonage.vonage_send_sms Write Send an SMS message via Vonage. Provide sender, recipient, and message text. The recipient number must be in E.164 format (e.g., 14155552671).
integration__vonage__vonage_verify_check vonage.vonage_verify_check Read Check a verification code against a Vonage Verify request. Provide the request_id from the verification and the code entered by the user.
integration__vonage__vonage_verify_request vonage.vonage_verify_request Read Send a verification code to a phone number via Vonage Verify. Returns a request_id used to check the code later.

Related Vonage Pages

Vonage CLIUse direct JSON commands instead of MCP discovery. Vonage MCPFull gateway reference and MCP tool names. KosmoKrator for LangGraphClient-level gateway setup.