atbridge.ai

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 measurably faster and cheaper than a cloud Gmail MCP bridge.

Tools

60+ MCP tools across five domains, talking to your running Thunderbird on your own machine — nothing is proxied through a cloud. Read tools are always available; write tools (marked ✏️) require ATBRIDGE_ALLOW_WRITES=1.

Mail

• mail_list — list recent messages in a folder, newest first (unread filter)
• mail_search — search by free text and/or sender, recipient, folder, date, read state, attachments
• mail_get — fetch one message (headers, body, attachment metadata)
• mail_thread — fetch a whole conversation thread
• mail_current — read the email the user is currently reading in Thunderbird
• mail_attachments / mail_attachment_get — list attachments and read one (incl. local PDF/XLSX/DOCX text extraction)
• mail_folders — all folders across all accounts with unread counts
• mail_fetch — trigger a new-mail check now
• mail_send ✏️ — compose and send a new message (or draft/template/later)
• mail_reply ✏️ — reply to a message
• mail_forward ✏️ — forward a message
• mail_compose ✏️ — build a branded, themed HTML email from a block layout
• mail_draft_edit ✏️ — edit an existing draft in place
• mail_mark ✏️ — set read/star/tags (bulk-capable)
• mail_move ✏️ — move messages between folders (bulk-capable)
• mail_delete ✏️ — trash or hard-delete messages (bulk-capable)
• mail_empty_trash ✏️ — empty an account's Trash
• mail_folder_create / mail_folder_rename / mail_folder_delete ✏️ — manage folders

Calendar

• calendar_list — list all calendars
• calendar_events_search — search events in a time window across calendars
• calendar_events_get — get one event by id
• calendar_find_slots — find free time slots (honours events + working hours)
• calendar_clash_check — check whether a proposed slot clashes
• calendar_settings — working hours, working days, timezone
• calendar_refresh — re-sync CalDAV/ICS calendars now
• calendar_events_create ✏️ — create an event (clash-checked; attendees, recurrence)
• calendar_events_update ✏️ — update an event or a single occurrence
• calendar_events_delete ✏️ — delete an event or occurrence
• calendar_events_rsvp ✏️ — respond to an invite (accept/decline/tentative)

Contacts

• contacts_books — list address books
• contacts_list — list contacts across books
• contacts_search — search across every field (name, email, phone, org, address, notes)
• contacts_show — show one contact by id, email, or name
• contacts_duplicates — find cards that are probably the same person
• contacts_lists / contacts_list_members — mailing lists and their members
• contacts_create / contacts_update / contacts_delete ✏️ — manage contacts
• contacts_list_create / contacts_list_delete / contacts_list_add / contacts_list_remove ✏️ — manage mailing lists

Notes — a local markdown workspace

• notes_list — list or full-text search saved notes
• notes_get — read one note by id or title
• notes_save ✏️ — save a new markdown note
• notes_update ✏️ — edit a note in place
• notes_move ✏️ — move or rename a note
• notes_delete ✏️ — delete a note

Tasks

• tasks_list — list to-dos (incomplete by default)
• tasks_create ✏️ — create a task (due, priority, recurrence, reminders)
• tasks_update ✏️ — update a task
• tasks_complete ✏️ — mark a task done (or reopen)
• tasks_delete ✏️ — delete a task

Plus accounts_list and the branded-email compose_templates* / compose_theme* tools. Full machine-readable reference: llms-mcp.txt · CLI reference: llms-cli.txt.

Setup

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

1. Install atbridge

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

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

2. Install the Thunderbird bridge — connects the local server to your running Thunderbird:

atbridge bridge install

3. Add atbridge to your MCP client — let atbridge write the config for you:

atbridge mcp setup --client claude|cursor|vscode|jetbrains|antigravity

…or add it by hand:

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

4. Unlock write tools (optional) — reads work out of the box; to allow send / reply / move / delete and calendar/contact edits, add "env": { "ATBRIDGE_ALLOW_WRITES": "1" } to the config above and restart the client.

Setup guides — step-by-step, per client:

• Install atbridge
• Which connection do I need? (MCP vs CLI)
• Claude Desktop
• Cursor
• JetBrains
• Antigravity
• MCP reference · all docs

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).

📺 Watch

• Product demo — youtube.com/watch?v=EVs0ricxqjw
• Install guides — macOS · Windows · Linux
• Channel — youtube.com/@atbridge

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
• YouTube — https://www.youtube.com/@atbridge
• 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: [email protected]