Use Letterhead MCP to take action in your AI tools

Add Content to Curations

Add a URL to a post, page, or other piece of content on the web to save to your curations library, which will make it easier to compose your newsletter.

Add or Update Audience Member (Legacy)

Deprecated — use "Add or Update Contact" instead, which works against your company-wide audience. This older action adds or updates an audience member on a single channel of your choosing. It still works so existing Zaps keep running, but new Zaps should prefer the contact action.

Add or Update Contact

Add a contact to your company-wide audience, or update an existing one. Identified by email — if the contact already exists, their details are updated. Optionally set the contact's subscription status on one or more channels. Requires a company-level API key.

Add Contact to Tag

Add a Letterhead tag to a contact in your company-wide audience, identified by email. Requires a company-level API key.

Add Audience Member to Tag (Legacy)

Deprecated — use "Add Contact to Tag" instead, which tags a contact in your company-wide audience. This older action tags an audience member on a single channel. It still works so existing Zaps keep running, but new Zaps should prefer the contact action.

Remove Contact From Tag

Remove a Letterhead tag from a contact in your company-wide audience, identified by email. Requires a company-level API key.

Remove Audience Member From Tag (Legacy)

Deprecated — use "Remove Contact from Tag" instead, which untags a contact in your company-wide audience. This older action removes an audience member from a channel-specific tag. It still works so existing Zaps keep running, but new Zaps should prefer the contact action.