---
title: "Letter AI MCP server"
url: "https://martechdb.com/vendors/letter-ai"
markdown_url: "https://martechdb.com/vendors/letter-ai.md"
api_url: "https://martechdb.com/api/v1/vendors/letter.ai"
updated: "2026-10-01"
---

# Letter AI MCP server

The official MCP server published by Letter AI. MartechDB lists only servers the vendor publishes itself, never community servers.

- Website: [letter.ai](https://letter.ai)
- Categories: [Projects & collaboration](https://martechdb.com/categories/projects-collaboration.md)

## Letter AI MCP server

- Address: https://api.letter.ai/v1/mcp
- Runs: Hosted
- Sign-in: Self-serve sign-in (`oauth_self_serve`)
- Official MCP Registry: listed
- How we found it: Live check of the vendor's own web address
- Last checked: 2026-10-01

### Connect it

Claude Code:

```sh
claude mcp add --transport http letter-ai https://api.letter.ai/v1/mcp
```

- Add to Cursor: <cursor://anysphere.cursor-deeplink/mcp/install?name=letter-ai&config=eyJ1cmwiOiJodHRwczovL2FwaS5sZXR0ZXIuYWkvdjEvbWNwIn0%3D>
- Add to VS Code: <vscode:mcp/install?%7B%22name%22%3A%22letter-ai%22%2C%22type%22%3A%22http%22%2C%22url%22%3A%22https%3A%2F%2Fapi.letter.ai%2Fv1%2Fmcp%22%7D>
- Claude.ai and Claude Desktop: Customize, Connectors, "+", Add custom connector, then paste https://api.letter.ai/v1/mcp
- ChatGPT: Settings, Apps, Advanced settings, turn on Developer mode, Create, then paste https://api.letter.ai/v1/mcp

JSON for Cursor, Windsurf and other clients that connect to hosted servers:

```json
{
    "mcpServers": {
        "letter-ai": {
            "type": "http",
            "url": "https://api.letter.ai/v1/mcp"
        }
    }
}
```

## Alternatives with an official MCP server

In Projects & collaboration:

- [Microsoft](https://martechdb.com/vendors/microsoft.md) (microsoft.com)
- [GitHub](https://martechdb.com/vendors/github.md) (github.com)
- [Dropbox](https://martechdb.com/vendors/dropbox.md) (dropbox.com)
- [Slack](https://martechdb.com/vendors/slack.md) (slack.com)

## Get this data

- API: `curl https://martechdb.com/api/v1/vendors/letter.ai`
- MCP: `claude mcp add --transport http martechdb https://martechdb.com/mcp`, then ask about Letter AI.
- Web page: https://martechdb.com/vendors/letter-ai