---
ref: tool:hubspot/add-to-segment
name: Add records to a segment
company: company:hubspot
workflows: [workflow:job-title-personas]
access: [mcp, api]
tags: [capability:build-audience, category:crm, has:api, has:mcp]
docs: https://developers.hubspot.com/docs/api-reference/latest/crm/lists/memberships/add-to-list
updated: 2026-09-29
---

# Add records to a segment

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

Note: Only `MANUAL` or `SNAPSHOT` segments take records; `DYNAMIC` ones follow their filters. The MCP tool 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.

```json
{ "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

Note: Use a service key or an app's static access token with the CRM scopes the calls need; paths carry a dated version such as `2026-09`.

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.