Add records to a segment

Add records to a segment

Adds contacts or other records, by ID, to a static segment (list).

HubSpot now calls lists segments. Add records to MANUAL or SNAPSHOT segments; DYNAMIC segments are kept in line with their filters. The MCP tool can also create a static segment, and it asks the user to confirm each write.

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": { "hubspot": { "url": "https://mcp.hubspot.com" } } }

Call the MCP tool manage_segment.

Server URL: https://mcp.hubspot.com

API (official)

• Base URL: https://api.hubapi.com
• Endpoint: PUT /crm/lists/2026-09/{listId}/memberships/add
• Auth: send the header Authorization: Bearer $HUBSPOT_API_KEY
• Docs: https://developers.hubspot.com/docs/api-reference/latest/overview

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.