Meet the Claude Connector: AI that helps you write — without giving up zero-knowledge

The hardest part of getting your affairs in order isn't the encryption or the deadman switches. It's starting. Staring at a blank note, trying to write the letter, list the accounts, or explain where everything is.

So we built something to help with exactly that — without bending an inch on privacy.

Killswitch now connects to Claude. You can ask Claude to draft a note, organize a notebook, or lay out instructions for your family, and it writes the first version for you. The catch — and the whole point — is that you decide what the AI is ever allowed to see.

Two tiers: Sealed and Standard

Every file, note, and notebook in Killswitch has an encryption mode, and you pick it when you create the item:

• Sealed — zero-knowledge (the default). Encrypted with a key that never leaves your device. Only you can read it — not Claude, not us.
• Standard — AI-assisted. Still encrypted, but during an active connector session Claude can read it and help you write.

You can see the mode on every item at a glance, so there's never any guessing about what's private and what's AI-readable:

The mental model is simple: Sealed is the vault. Standard is the workbench. Draft on the workbench with Claude's help, and seal anything you want kept truly private.

What Claude can do for you

Once connected, you can ask Claude things like:

• "Draft a letter to my kids to include in my Killswitch."
• "Turn these rough notes into an organized notebook for my executor."
• "List the accounts I've added and flag anything missing."
• "Set up a deadman switch that shares my Property Deed with my sister."

Behind the scenes, the connector exposes a focused set of tools — Claude can read and create your Standard notes and notebooks, list your documents, manage beneficiaries, and help configure deadman switches. It only ever works with the items you've made Standard. Sealed content simply isn't reachable.

Connecting Claude (one-time setup)

Connecting takes about a minute. In Killswitch, head to Settings → Connector:

Then, in Claude Desktop:

1. Open Settings → Connectors → Add custom connector.
2. Paste the Killswitch connector URL: https://killswitch.app/mcp (you can copy it straight from the Connector tab).
3. Claude opens your browser to sign in and approve the connection. You'll see exactly which permissions it's requesting — approve them to finish.

That's it — Claude and Killswitch are linked. (This is a one-time setup; you won't repeat it.)

Note: connecting Claude does not automatically give it access to your content. It just establishes the link. Access only happens during a session you explicitly start — which is the next step.

Unlock for Claude — on your terms, time-boxed

This is the part we're proud of. Connecting is permission to ask; reading your Standard content requires a deliberate, time-boxed unlock.

Back on the Connector tab, choose a session length and click Unlock for Claude. For that window, Claude can read and write your Standard notes and documents. When the session expires — or the moment you revoke it — Claude loses access.

Here's exactly what happens under the hood, because you should know:

• While a session is active, your decryption key for Standard items is held in the server's memory (RAM) so Claude can actually help. It is never written to disk.
• Sealed items are never accessible — to Claude or to Killswitch — even during an active session. They're encrypted with a separate key that never leaves your device and is never shared with the connector.
• Sessions expire automatically, and revoking a session immediately drops the key from memory. Claude's access ends at that instant.
• Beneficiaries and deadman switches work without ever unlocking.

In other words: AI assistance is opt-in, scoped, and temporary — and your private vault stays a private vault the entire time.

Get started

If you've been meaning to write that note or organize those instructions, this is the easiest it's ever been:

1. Create a note or notebook and mark it Standard.
2. Connect Claude Desktop to https://killswitch.app/mcp.
3. Click Unlock for Claude, then ask Claude to draft it.
4. Review, edit, and seal anything you want kept private.

New to Killswitch? Start a free trial at killswitch.app/register — and see everything we've shipped on the changelog.

Your documents. Your keys. Now with a little help, exactly when you ask for it.