Give your AI client your whole workspace — privately.
atbridge.ai has a local MCP server for Thunderbird, so your AI client can read and act on your emails, calendars, contacts, notes & tasks. Your mail is never routed through our servers, every operation is ~20× faster and uses ~72% fewer tokens than a cloud mail MCP, and it works with whatever model your AI client already runs.
One way into one product
MCP is a doorway, not a separate app. Behind it is a single private suite for your emails, calendars, contacts, notes & tasks — one subscription, one ops budget, private by design. Use it from your AI client here, from the command line, or from @bridge inside Thunderbird.
What it is
atbridge mcp is a local MCP server that exposes your
Thunderbird emails, calendars, contacts, notes & tasks as 59 tools by default
(66 with admin) to any MCP client. Point a client at the atbridge binary and
it can read and (when you allow it) act on them.
{
"mcpServers": {
"atbridge.ai": {
"command": "atbridge",
"args": ["mcp"]
}
}
}Drop this into your client's MCP config — the server key is atbridge.ai, the command is the bare atbridge binary.
Why it beats cloud mail MCP
Cloud connectors ship your whole mailbox to a third party and add a network hop to every call. atbridge.ai keeps the mail on your machine and answers locally.
| Cloud mail MCP (provider-hosted) |
atbridge.ai | |
|---|---|---|
| Your mail leaves your machine | All of it, to a third-party cloud | Never — local loopback |
| Latency per operation | Network round-trip (~110 ms floor) | Single-digit ms — ~20× faster |
| Tokens per fetch | Full HTML payloads | Text by default — ~72% fewer, ~3.5× cheaper |
| Mailboxes | One mailbox — the single account tied to your AI subscription's sign-in | Every mailbox you have, across any provider (Gmail, Outlook, iCloud, IMAP) |
| Model | The provider's | Whatever your client already runs |
Works with your client
If it speaks MCP, it works. atbridge.ai runs the same server for every one of them.
One-click setup: atbridge mcp setup --client <id>
Setup guides: Claude Desktop ·
Cursor ·
JetBrains ·
Antigravity
Using VS Code or Claude Code? Follow the Cursor guide — the steps are the same.
Safe by default
Read-only until you opt in. A three-way gate decides what your AI can touch — so an agent can't send or delete anything unless you turn it on.
See your workspace
List, search and read emails, threads, calendar events, contacts, notes and tasks. Available the moment the server starts.
ATBRIDGE_ALLOW_WRITES=1Act on it
Send, reply, forward, move, delete, and create calendar events or contacts — only when you explicitly enable writes.
ATBRIDGE_ADMIN_TOOLS=1Manage the account
Billing, devices, version and update. Off by default — turn on only if you want the agent to manage the app itself.
59 tools by default (26 read + 33 write) · 66 with the 7 admin tools enabled.
Any model, no lock-in
Over MCP the model is whatever your client runs — Claude, a local model in Cursor, whatever you already pay for. There's no model picker to configure here and no per-token cap from us. atbridge.ai supplies the tools; your client brings the intelligence.
Pricing
One atbridge.ai subscription is the whole productivity suite — emails, calendars, contacts, notes & tasks — across MCP, the CLI and @bridge inside Thunderbird; MCP is just one way in. See the landing page and full pricing for the complete picture.
MCP is on every plan, including Free — metered from one shared ops budget.
Free
MCP works on Free too — it runs from your 20 ops / month budget. Start with 14 days of unlimited Pro.
Get started — freePersonal
€7.99 standard price after Nov 1
Excl. VAT
Early-bird · held while subscribed
300 ops / month shared across mail, MCP & chat — plenty for daily work in your AI client.
Get PersonalPro
€14.99 standard price after Nov 1
Excl. VAT
Early-bird · held while subscribed
Unlimited ops. Let your agent work all day with no budget to watch.
Get Pro| Free | Personal | Pro | |
|---|---|---|---|
| Ops / month | 20 | 300 | Unlimited |
| @bridge MCP | ✓ (from budget) | ✓ (from budget) | ✓ Unlimited |
| Devices | 1 | 2 | 5 |
| Email accounts | 1 | Unlimited | Unlimited |
Frequently asked questions
Is this an alternative to cloud mail MCPs?
Yes. Instead of pointing your AI at a cloud mail MCP hosted on a provider's servers, atbridge.ai runs an MCP server on your own machine and works whatever mailboxes Thunderbird already has — Gmail, Outlook, iCloud or IMAP — with your mail never routed through our servers. It isn't mail-only, either: the same server exposes your emails, calendars, contacts, notes and tasks.
Does my email go to any cloud?
No. The MCP server runs locally and talks to Thunderbird over a local loopback connection. Your messages are never routed through atbridge.ai servers — only the AI client you choose sees the specific text you ask it to work with.
Which clients work with it?
Any MCP client — Claude Desktop, Cursor, JetBrains, VS Code, Claude Code and Antigravity are all supported. Run atbridge mcp setup --client <id> to configure one automatically, or paste the small JSON config into any client that speaks MCP.
Can it send or delete mail, or only read?
Read-only by default. The 26 read tools are always available; the 33 write tools (send, reply, move, delete, calendar and contact edits) only appear when you start the server with ATBRIDGE_ALLOW_WRITES=1. An agent can't send or delete anything unless you turn writes on.
What does it cost, and which plans include MCP?
MCP is on every plan, including Free. It draws from one shared ops budget: 20 ops per month on Free, 300 on Personal and unlimited on Pro. Every new account starts with a 14-day full-Pro trial. The AI conversation itself is free — only the mailbox action it triggers counts as an op.
Does it work with Outlook, iCloud or self-hosted IMAP?
Yes. atbridge.ai works with any account Thunderbird can connect to — Gmail, Outlook or Microsoft 365, iCloud, Fastmail or your own IMAP server. Add the account in Thunderbird and it's available to your AI client through MCP.