Use TextKit in ChatGPT
ChatGPT can use tools from an MCP server you add as a plugin. 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
Open ChatGPT plugins, select +, then Add custom MCP server. Name it TextKit and use this URL, with OAuth for authentication:
https://mcp.jointextkit.com/chatgptAccept ChatGPT's warning about custom servers and select Create as a plugin. In a chat, type @ and pick TextKit.
The /chatgpt address has every tool except phone verification and API
keys, which ChatGPT plugins may not handle. For those, use the API from your
app.
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.
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: