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.

Note: Leave subscribed out unless you mean to unsubscribe or re-subscribe the contact. Changing a contact's email address needs its userId: send the userId with the new address.

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 with PUT /v1/contacts/update.

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

Note: Every operation runs through three tools: search finds it, describe shows its inputs, execute runs it.

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 anything else, confirm access with the cheapest read-only call, like a list or a search. Never send or change anything to test access.

Rules

• Ask the user before anything that sends messages, costs money, or changes data, and say how many records it touches. One approval covers a batch the user has seen.
• Never print API keys.