---
title: builder_create
url: "/docs/ai-agents/mcp-tools/builders/builder_create/"
canonical_url: https://docs.blossom88.com/docs/ai-agents/mcp-tools/builders/builder_create/
markdown_url: https://docs.blossom88.com/docs/ai-agents/mcp-tools/builders/builder_create.md
summary: Create a dedicated Builder in a region, within the capacity limit.
categories:
- mcp
- reference
---

# builder_create

Create a dedicated Builder in a region, within the capacity limit.

| | |
|---|---|
| Access | Changes Blossom |
| Same as | [`blossom builder:create`](/docs/reference/cli/builder/create/) |

## Arguments

| Argument | Type | Description |
|---|---|---|
| `data` | object | The Builder, as in builder.yml from builder:init. Required. |
| `data.capacity_id` | string | Capacity id; sets its region. |
| `data.name` | string | Builder name. |
| `data.timeout_seconds` | integer | Longest build. |
| `data.idle_retention_seconds` | integer | How long it stays warm after a build. |
| `data.size_unit_count` | integer | Size in units. |
| `data.default` | boolean | The region's default Builder. |
| `data.volume_gib` | integer | Build cache size. |

## Example

```json
{"data":{"clone_url":"https://github.com/acme/shop","services":[{"name":"web","command":"web","port":3000,"publicly_exposed":true}]}}
```