A Good Sign

Start on iPhone. Then connect your AI.

A Good Sign is an iPhone app that privately syncs the Apple Health categories you choose. Once you connect an AI assistant, you can ask it about the data you’ve synced.

Sign in and sync

Use Sign in with Apple, start or restore the subscription, choose Health permissions, and complete the first sync.

Connect your AI

You may connect before subscribing, but health-data questions remain locked until the subscription is active and the iPhone has synced.

Choose your AI

Set up the connection on a computer. Afterward, supported AI apps can use it on mobile too.

Server address for manual connectionshttps://api.healthgateway.app/mcp

Claude

Published plugin in the Claude directory

  1. Open A Good Sign in Claude.
  2. Choose Add to Claude, then follow the prompts to connect and sign in with Apple.

Codex

A Good Sign plugin · Manual installation

  1. On your computer, add the Good Feels marketplace and install the plugin with the two commands below.
  2. Restart Codex and begin a new chat.
  3. Ask Codex to use A Good Sign, then complete the secure browser connection.
codex plugin marketplace add Good-Feels/health-gateway-codexcodex plugin add health-gateway@health-gatewayRequires the Codex CLI. The plugin also appears in Codex after installation. Download a versioned package.

Gemini

Eligible Gemini Spark accounts · Mobile after web setup

  1. On a computer, open gemini.google.com → Settings & help → Connected Apps.
  2. Under Custom apps for Spark, add a custom app and paste the server address.
  3. Complete sign-in, then select your connection with @ in a Spark task.

ChatGPT

Manual setup on eligible ChatGPT web accounts

  1. Open ChatGPT Plugins. Choose Add, then Add custom MCP server.
  2. Name it A Good Sign, paste the server address above, and choose OAuth.
  3. Review the permission notice and create the plugin. Install it from Personal and follow the prompts to sign in with Apple.
  4. Start a chat and select A Good Sign with @.

If you don’t see Add custom MCP server, choose another assistant.

Perplexity

Remote MCP rolling out to paid subscribers

  1. On a supported account, open Account Settings → Connectors → Add Connector.
  2. Choose Remote and paste the server address.
  3. Save, connect, and complete Sign in with Apple. If Remote is not shown yet, the feature has not reached that account.

Your email addresses do not need to look the same. What matters is using the same Apple Account in the iPhone app and the browser connection. Sign in with Apple may show a private relay address; that is normal. Create a one-time link code in the iPhone app only if the browser asks for one. You can revoke any authorized AI later under Advanced → AI Access.