Local MCP server for Tether — AI Health Sync: your AI agent reads your end-to-end-encrypted Apple Health data (sleep, cycle, weight, water), decrypted only on your machine
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# Tether MCP Server **Let your own AI agent read your health data — without the cloud ever seeing it.** This is the official local [MCP](https://modelcontextprotocol.io) server for [Tether — AI Health Sync](https://apps.apple.com/us/app/tether-ai-health-sync/id6759241985), the iOS app that syncs Apple Health data (sleep, heart rate, menstrual cycle, weight, water, symptoms) between partners and to your own AI — end-to-end encrypted. Tether embeds no AI and runs no model on your phone. Intelligence lives where you control it: Claude Code, Claude Desktop, or any MCP-capable agent running on your own machine. This server is the bridge — it holds a private key that never leaves your computer, pulls ciphertext from the cloud, and decrypts **only locally**. ``` iPhone (Apple Health) ──E2EE──▶ cloud (ciphertext only) ──E2EE──▶ this server (your machine) ──▶ your AI agent ``` ## Requirements - [Tether — AI Health Sync](https://apps.apple.com/us/app/tether-ai-health-sync/id6759241985) on iOS, with a **Pro** subscription (the AI-agent interface is the Pro tier) - Python 3.11+ on the machine where your agent runs (macOS / Linux / Windows) ## Quick start ### 1. Install With [uv](https://docs.astral.sh/uv/) (recommended — no clone needed): ```bash uvx --from 'git+https://github.com/Fino-wind/tether-mcp' tether-mcp status ``` Or with pip: ```bash pip install 'tether-mcp[qr] @ git+https://github.com/Fino-wind/tether-mcp' ``` ### 2. Bind your phone ```bash tether-mcp bind ``` This generates a keypair on your machine and prints a QR code. In the Tether iOS app, open **Settings → Data & AI → MCP Server** and scan it (or import a QR screenshot from Photos). The app authorizes this machine and starts sealing your health envelopes to its public key. The private key stays in `~/.tether/mcp-local/` (owner-only `0600` permissions, OS keychain where available) — it is never uploaded anywhere. ### 3. Connect your agent **Claude Code** (one line): ```bash claude mcp add tet…
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