atbridge

Your private AI suite for emails, calendars, contacts, notes & tasks — in Thunderbird, over MCP, or from the CLI. Runs on your own machine, works with any AI, no cloud middleman.

Website: atbridge.ai · Docs: atbridge.ai/docs

atbridge turns Thunderbird into one AI-driven workspace for emails, calendars, contacts, notes, and tasks — across every account you already have (Gmail, Outlook, iCloud, self-hosted / IMAP). Manage it all with the AI of your choice — from inside Thunderbird, from Claude Desktop or your IDE over MCP, or from the command line (CLI). MCP and the CLI are separate surfaces: MCP exposes atbridge as tools to an AI client, while the CLI runs atbridge commands directly in your shell, scripts, and CI.

Why atbridge

• 🔒 Private & local-first. Everything runs on your machine. Your messages and API keys never route through atbridge's servers — a model only ever receives what you choose to send it.
• 🤖 Any AI, no lock-in. 12 providers, including a fully private local model via Ollama (see below).
• 🖥️ Three surfaces, one binary. The built-in atbridge panel in Thunderbird, an MCP server for AI clients and IDEs, and a CLI for scripts and CI.
• 📝 atbridge Notes. A local markdown workspace with linked notes and voice memos the AI can read and write.
• ⚡ Measurably leaner. Because it talks to Thunderbird locally instead of proxying your mailbox through a cloud, it's ~20× faster per operation and 3.5× cheaper per fetch (72% fewer input tokens) than a cloud Gmail MCP bridge. Methodology →

Use atbridge as an MCP server

atbridge exposes its mail / calendar / contacts / notes / tasks operations as MCP tools. Add it to any MCP client (Claude Desktop, Cursor, VS Code, JetBrains, Antigravity):

{
  "mcpServers": {
    "atbridge.ai": { "command": "atbridge", "args": ["mcp"] }
  }
}

Reads are enabled by default; to unlock write tools (send, reply, forward, move, delete, calendar/contact edits) add "env": { "ATBRIDGE_ALLOW_WRITES": "1" } and restart the client. Or let atbridge write the entry for you: atbridge mcp setup --client claude|cursor|vscode|jetbrains|antigravity.

Requirements: atbridge is a local MCP server for Thunderbird — it talks to your running Thunderbird via a native-messaging bridge. It needs Thunderbird + the atbridge add-on installed (atbridge bridge install), not a remote endpoint. It is not a hosted/cloud server and is not distributed via npm/pip — install the signed binary from atbridge.ai first.

Full machine-readable tool reference: llms-mcp.txt · CLI reference: llms-cli.txt

Supported AI providers

OpenAI · Anthropic Claude · Google Gemini · Mistral · DeepSeek · Moonshot Kimi · xAI Grok · Groq · OpenRouter · NVIDIA · any OpenAI-compatible endpoint · Ollama (fully local, private).

You can also drive the in-Thunderbird atbridge chat with an AI CLI you already have — Claude Code, OpenAI Codex, or Antigravity — using your existing subscription (BYO compute, no API key).

Install

# macOS / Linux
curl -fsSL https://atbridge.ai/install.sh | sh

# Windows (PowerShell)
irm https://atbridge.ai/install.ps1 | iex

Then install the native bridge into Thunderbird: atbridge bridge install. Full setup guides (Claude Desktop, Cursor, and more): atbridge.ai/docs.

Three ways to use it

• Inside Thunderbird — the atbridge AI Chat panel, branded HTML email compose, deterministic Skills, and atbridge Notes.
• Over MCP — Claude Desktop, Cursor, VS Code, JetBrains, Antigravity, or your own agents. No Thunderbird UI required once the bridge is installed.
• From the CLI — every operation scriptable for shell, cron, and CI.

Pricing

Free to start; Personal and Pro plans for power users. See atbridge.ai/pricing.

Links

• Website — https://atbridge.ai
• Documentation — https://atbridge.ai/docs
• LLM-readable overview — https://atbridge.ai/llms.txt

About

atbridge is a proprietary, commercial product distributed as signed binaries for macOS, Linux, and Windows. This repository is the product's public home and documentation; it does not contain the application source. Available in 23 UI languages.

© 2026 atbridge. All rights reserved. Questions: contact@atbridge.ai