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# Create segment

> Save a segment under Messaging > Segments from criteria joined with and or or. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/postscript/create_segment

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Save a segment under Messaging > Segments from criteria joined with and or or.

Postscript MCP tools: https://cotlet.dev/docs/mcp/postscript.md

MCP tool: `postscript_write → create_segment`

Access: write.

Saves a segment from the criteria you give, each as a criterion name from the Segments editor, a parameter such as equals or before last, and a value. join is and or or and links an item to the one before it; the first item has none. Returns the Segment Size Postscript computes. It messages nobody and only saves the definition, so it does not wait for your OK. include_phone_only adds subscribers not yet linked to a Shopify customer, and purchase filters do not apply to them.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `name` | string | yes | Segment name. |
| `criteria` | array | yes | List of {criterion, parameter, value, join}. join is and or or, absent on the first item. |
| `include_phone_only` | boolean | no | Include all phone-only subscribers. Default: false. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "postscript_write",
    "arguments": {
      "operation": "create_segment",
      "arguments": {
        "name": "Unengaged 180 days",
        "include_phone_only": false,
        "criteria": [
          {
            "criterion": "Number of Orders",
            "parameter": "equals",
            "value": "0"
          },
          {
            "join": "or",
            "criterion": "Last Order Date",
            "parameter": "before last",
            "value": "365 days"
          },
          {
            "join": "and",
            "criterion": "Subscriber Has Clicked",
            "parameter": "not equal to",
            "value": "TRUE"
          },
          {
            "join": "and",
            "criterion": "Subscriber Created Date",
            "parameter": "before last",
            "value": "180 days"
          },
          {
            "join": "and",
            "criterion": "Number of Replies",
            "parameter": "equals",
            "value": "0"
          }
        ]
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "segment_id": "60418",
    "name": "Unengaged 180 days",
    "size": 3412,
    "include_phone_only": false
  },
  "isError": false
}
```

Previous: [List conversations](https://cotlet.dev/docs/mcp/postscript/list_conversations.md)
Next: [Create campaign draft](https://cotlet.dev/docs/mcp/postscript/create_campaign.md)

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