Set up Tether

Sign in with GitHub, Google or an email link. Your first sign-in creates your account, and you can use it straight away. Tether is free while it’s in early access.

Tether’s MCP server URL is https://www.usetether.io/sse/mcp. It uses OAuth, so there is no API key: your assistant opens a browser window and you sign in to Tether there. If you aren’t signed up yet, that sign-in creates your account.

Add Tether to Claude. The link opens Claude’s connector settings with Tether filled in. Click Add, then Connect, sign in and allow access. It works on the web and desktop apps, and the connector then shows up on mobile too.

By hand: in Claude, open Customize → Connectors, choose Add custom connector, name it Tether and paste the server URL.

ChatGPT adds custom MCP servers as plugins, on chatgpt.com (not the mobile app). Full MCP support is on Business, Enterprise and Edu, where an admin or owner adds the server (or, on Enterprise and Edu, a member they’ve allowed to); Pro can add it with read-only access.

1. Open ChatGPT Plugins, click + and choose Add custom MCP server.
2. Name it Tether. Under Connection, paste the server URL, and choose OAuth for authentication.
3. Tick I understand and want to continue, then click Create as a plugin and sign in to Tether to allow access.
4. Install the plugin. In a new chat, type @ and pick Tether.

On a workspace, an admin publishes it for everyone else. OpenAI’s instructions cover permissions and publishing.

Run this in your terminal:

claude mcp add --transport http tether https://www.usetether.io/sse/mcp

Then type /mcp in Claude Code and pick Tether to sign in.

Add Tether to Cursor. Cursor asks to install it; then sign in from Settings → MCP.

By hand, add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "tether": {
      "url": "https://www.usetether.io/sse/mcp"
    }
  }
}

Add Tether to VS Code. VS Code asks to install it; start the server from the MCP view and sign in when prompted.

By hand, add this to .vscode/mcp.json, or run MCP: Add Server from the command palette:

{
  "servers": {
    "tether": {
      "type": "http",
      "url": "https://www.usetether.io/sse/mcp"
    }
  }
}

Any client that supports remote MCP servers over streamable HTTP with OAuth works. Give it the server URL and it will open a browser window for you to sign in.

• From your assistant. Paste a call transcript, an email thread or a LinkedIn conversation into the chat and ask it to add it to Tether. If your assistant can reach your call recorder or inbox, ask it to find your recent customer calls and emails.
• By email. Each product has its own private address. Forward a customer email, or a notification from Indie Hackers, LinkedIn, X, Reddit and others, from your account’s email, and it’s saved with the person attached. Tether replies with what it saved.
• From any web page. Install Tether for Chrome, select what a customer wrote (on Reddit, Hacker News, Indie Hackers, a review site, anywhere) and add it as a quote.
• From Slack. Add Tether to your workspace and turn on feedback import for the channels where customers talk.
• From GitHub. Connect your repositories and each pull request is matched to the pain points it addresses.

Your email address, Slack, GitHub and Chrome are all under Integrations once you’re signed in. Every piece of feedback is matched to your customers’ pain points automatically.

Try these in your assistant:

• “What are my customers’ biggest pain points? Use Tether.”
• “What have customers said about onboarding? Use Tether.”
• “Which customers asked for an export feature?”

Questions? See the FAQ or how Tether works.