Create or update a contact

Create or update a contact

Updates the contact with a matching email address or user ID, or creates it, with properties and mailing list subscriptions.

Identify the contact by email or userId. To change a contact's email address, it needs a userId: send the userId with the new address. Leave subscribed out unless you mean to unsubscribe or re-subscribe the contact. Set list membership with mailingLists (--list <id>=true on the CLI). On the MCP server, search, describe and execute find, inspect and run this operation.

Set up

Use the first option your agent supports.

MCP (official, remote)

Add this server to your agent's MCP settings, then sign in when asked.

{ "mcpServers": { "loops": { "url": "https://mcp.loops.so" } } }

Call the MCP tool execute.

Server URL: https://mcp.loops.so

CLI (official)

Install the command, then confirm it runs.

brew install loops-so/tap/loops
loops --version

Run loops contacts update.

Set $LOOPS_API_KEY in your environment first (get a key: https://app.loops.so/settings?page=api).

API (official)

• Base URL: https://app.loops.so/api
• Endpoint: PUT /v1/contacts/update
• Auth: send the header Authorization: Bearer $LOOPS_API_KEY
• Get a key: https://app.loops.so/settings?page=api
• Docs: https://loops.so/docs/api-reference/intro

Before doing anything else, make one read-only call to confirm access.

Rules

• Ask the user before anything that sends messages, costs money, or changes data.
• Never print API keys.