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Twilio MCP Server
for AI Agents

Connect your AI agent to StackOne's Twilio MCP server and give it 40 MCP tools out of the box. Auth, tool execution, and security all managed.

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Twilio MCP Server
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Coverage

40 Agent Actions

Create, read, update, and delete across Twilio — and extend your agent's capabilities with custom actions.

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

Per-user OAuth in one call. Your Twilio MCP server gets session-scoped tokens with zero credentials stored on your infra.

Agent Auth →

Security

Agent Protection

Every Twilio tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.

Prompt Injection Defense →

Performance

Max Agent Context. Min Cost.

Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every Twilio call.

Tools Discovery →

What is the Twilio MCP Server?

A Twilio MCP server lets AI agents read and write Twilio data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Twilio MCP server ships with 40 pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.

All Twilio MCP Tools

Every action from Twilio's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.

Messages

  • Create Message

    Create a new SMS or MMS message

  • List Messages

    List all messages sent or received by your Twilio account

  • Get Message

    Retrieve details of a specific message by SID

  • Update Message

    Update a message (redact message body or cancel scheduled message)

  • Delete Message

    Delete a message record

Message Medias

  • List Message Media

    List all media associated with a message

  • Get Message Media

    Retrieve details of a specific media item attached to a message

  • Delete Message Media

    Delete a specific media instance

Calls

  • List Calls

    List all calls made to and from your Twilio account

  • Get Call

    Retrieve details of a specific call by SID

  • Update Call

    Modify an in-progress call (redirect, cancel, or complete)

  • Delete Call

    Delete a call record

Make Calls

  • Make Call

    Initiate an outbound call

Call Recordings

  • List Call Recordings

    List all recordings for a specific call

Accounts

  • Create Account

    Create a new account under the main account

  • Get Account

    Retrieve account information and current status

  • List Accounts

    List all accounts including the main account and subaccounts

  • Update Account

    Update account properties (friendly name or status)

Conversations

  • Create Conversation

    Create a new conversation

  • List Conversations

    List all conversations in your account

  • Get Conversation

    Retrieve details of a specific conversation by SID

  • Update Conversation

    Update an existing conversation

  • Delete Conversation

    Delete a conversation

Conversation Messages

  • Create Conversation Message

    Create a new message in a conversation

  • List Conversation Messages

    List all messages in a conversation

  • Get Conversation Message

    Retrieve details of a specific message in a conversation

  • Update Conversation Message

    Update an existing message in a conversation

  • Delete Conversation Message

    Delete a message from a conversation

Conversation Participants

  • Create Conversation Participant

    Create a new participant in a conversation

  • List Conversation Participants

    List all participants in a conversation

  • Get Conversation Participant

    Retrieve details of a specific participant in a conversation

  • Update Conversation Participant

    Update a participant in a conversation

  • Delete Conversation Participant

    Delete a participant from a conversation

Conversation Users

  • Create Conversation User

    Create a new user in the conversations service

  • List Conversation Users

    List all users in the conversations service

  • Get Conversation User

    Retrieve details of a specific user

  • Update Conversation User

    Update an existing user

  • Delete Conversation User

    Delete a user from the conversations service

Conversation Webhooks

  • List Conversation Webhooks

    List all webhooks configured for a specific conversation

User Conversations

  • List User Conversations

    List all conversations a specific user belongs to

Set Up Your Twilio MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to Twilio in under 10 lines of code.

MCP Clients

Claude Desktop setup guide
Claude Code setup guide
Cursor setup guide
Goose setup guide

Agent Frameworks

Claude Desktop
{
  "mcpServers": {
    "stackone": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote@latest",
        "https://api.stackone.com/mcp?x-account-id=<account_id>",
        "--header",
        "Authorization: Basic <YOUR_BASE64_TOKEN>"
      ]
    }
  }
}

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Platform Resources

MCP Code Mode: Keeping Tool Responses Out of Agent Context

Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.

11 min

Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery

Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.

10 min

Indirect Prompt Injection Defense for MCP Tools: A Technical Guide

MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.

12 min

MCP vs A2A: Architecture, Security, and When to Use Each

MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.

12 min

MCP vs API: What 200+ Connector Builds Taught Us

MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.

14 min read

Twilio MCP Server FAQ

Does StackOne have a Twilio MCP server?
Yes. StackOne offers a hosted Twilio MCP server with 40 pre-built actions, and every action is tested and QA'd by StackOne. Connect it to Claude, Cursor, and any other MCP client, or to any agent framework through the AI Action SDK. It ships with managed agent authentication, prompt injection defense, and tool discovery with server-side execution that preserve your agent's context window and keep reasoning performance.
Twilio MCP server vs direct API integration — what's the difference?
A Twilio MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Twilio. A Twilio MCP server is for AI agents — MCP clients like Claude and Cursor, plus framework agents built with OpenAI, LangChain, or Vercel AI — discovering and calling Twilio at runtime. StackOne provides both.
How does Twilio authentication work for AI agents?
Twilio authentication for AI agents works through a StackOne Connect Session. Create one via the dashboard or the SDK — you get an auth link and ready-to-paste config for Claude Desktop, Cursor, and other MCP clients. Your user authenticates their own Twilio account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.
Are Twilio MCP tools vulnerable to prompt injection?
Yes — Twilio MCP tools can be vulnerable to indirect prompt injection. Any tool that reads user-written content — documents, messages, tickets, records, or free-text fields — is a potential vector. StackOne Defender scans every tool response before it enters the agent's context — regex patterns in ~1ms, then a MiniLM classifier in ~4ms. 88.7% accuracy, CPU-only.
What is the context bloat of a Twilio agent and how do I avoid it?
Context bloat happens when Twilio tool schemas and API responses eat your Twilio agent's memory, preventing it from reasoning effectively. A single Twilio query can return a massive JSON response, and connecting multiple tools compounds the problem. Tools Discovery and Code Mode reduce context bloat — loading only relevant tools per query and keeping raw responses out of the agent's context.
Can I limit which actions my Twilio agent can access?
Yes — you can limit which actions your Twilio agent can access directly from the StackOne dashboard. Toggle actions on or off, or restrict them to specific accounts, with no code changes to your agent. Session tokens can be scoped to exact actions so if one leaks, exposure stays contained.
Can I create custom agent actions for my Twilio MCP server?
Yes — you can create custom agent actions for your Twilio MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Twilio's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Twilio MCP server?
Skip a Twilio MCP server if your integration is purely software-to-software — direct Twilio API integration is simpler when no AI agent is involved. For deterministic, compliance-critical operations (financial transactions, regulatory reporting), direct API gives you predictable behavior without agent-driven decision-making. MCP shines when AI agents need to dynamically discover and call Twilio actions at runtime.
What AI frameworks and AI clients does the StackOne Twilio MCP server support?
The StackOne Twilio MCP server supports both. MCP clients (paste-and-go apps): Claude Desktop, Claude Code, Cursor, VS Code, Goose. Agent frameworks (code SDKs you build with): OpenAI Agents SDK, Anthropic, Vercel AI, Google ADK, CrewAI, Pydantic AI, LangChain, LangGraph, Azure AI Foundry.

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All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.

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