TextKit

Use TextKit in Windsurf

Windsurf's Cascade agent, now part of Devin Desktop, runs MCP tools. Connect the TextKit MCP server and the agent can send texts, verify phone numbers, buy numbers, load contacts and run broadcasts on your account as tool calls.

You need a TextKit account: sign up for a free sandbox, no card.

Connect with sign-in

Add TextKit to mcp_config.json (~/.config/devin/mcp_config.json on macOS and Linux, %APPDATA%\devin\mcp_config.json on Windows):

json
{
  "mcpServers": {
    "textkit": { "serverUrl": "https://mcp.jointextkit.com" }
  }
}

Or with the Devin CLI:

bash
devin mcp add textkit https://mcp.jointextkit.com
devin mcp login textkit

The first time it connects, you are sent to TextKit to sign in. Approve the connection and choose test or live data. Start with test data: every call runs in the sandbox and no real phone gets a text. Approving creates an API key named for the app, listed on the API keys page of the console; revoke it there to disconnect. Only an account admin can approve.

Connect with an API key

json
{
  "mcpServers": {
    "textkit": {
      "serverUrl": "https://mcp.jointextkit.com",
      "headers": { "Authorization": "Bearer ssms_sk_test_..." }
    }
  }
}

Use a test key (ssms_sk_test_...) from the API keys page of the console to start; a live key texts real phones and bills your balance.

Things to ask

Buy a number in area code 512 and text +15005550006 "Your order shipped."

Import the contacts in this CSV, tag them spring-sale, and tell me how many have an opt-in.

Send everyone tagged vip "Doors open at 9 on Saturday." Do a dry run first and show me the count and cost.

How did yesterday's broadcast do? Show delivered, failed, replies and opt-outs.

Before a broadcast the agent runs a dry run and shows you the recipients, the cost and anyone left out, and it sends only after you agree. Every tool is one API call with the connection's key, so the key's scopes, rate limits and send checks apply unchanged. The MCP server docs list every tool.

Building an app that texts

If you are writing code, ask the agent to add the feature with the SDK and point it at the docs: every page is available as markdown (add .md to the path). The quickstarts cover Node.js, Python and plain HTTP, and Verify covers phone verification in two calls. Test keys run in the sandbox: send to +15005550006 and the message always ends delivered.

Sources

The steps above follow the platform's own documentation:

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