Draft email campaigns in day3 from Claude Code, Cursor or VS Code as editable composer blocks.
Connect Remote server
claude mcp add --transport http day3 https://go.day3.app/api/mcp --header "Authorization: Bearer <YOUR_API_KEY>"
{
"mcpServers": {
"day3": {
"url": "https://go.day3.app/api/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
{
"servers": {
"day3": {
"type": "http",
"url": "https://go.day3.app/api/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
Settings > Connectors > Add custom connector
URL: https://go.day3.app/api/mcp
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server asks for a key before it lists its tools. Connect it with your own key to see them.
Headers
| Name | Description |
|---|---|
AuthorizationRequired, secret | Bearer token: 'Bearer day3_live_...', an API key created in the day3 app |
Details
| Endpoint | https://go.day3.app/api/mcp (Streamable HTTP) |
| First published | 11 Oct 2026 |
| Last updated | 11 Oct 2026 |
| Registry name | io.github.Mopra/day3 |
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