# Create a stage definition

> `POST` `/v1/process-definitions/{id}/stage-tools`

URL: https://www.agencytitan.com/docs/tag/stage-tools/POST/v1/process-definitions/{id}/stage-tools

Operation ID: `stage_tools_create`

Tag: [stage_tools](https://www.agencytitan.com/docs/tag/stage-tools.md)

## Description

Creates one complete validated stage shell in an explicit process. The versioned body is an exact domain command; builder-session planner artifacts never appear in this contract.

## Parameters

- `id` (path, required, `string`) — Resource identifier (UUID).

## Request body

- Required: yes
- Content-Type: `application/json`
  - Type: `object`
  - Properties:
    - `assigned_to` (`array<string>`, required)
    - `auto_due_date_days` (`number|null`, required)
    - `auto_start_date_anchor` (`string|null`, required)
    - `auto_start_date_days` (`number|null`, required)
    - `color` (`string`, required)
    - `default_priority` (`string`, required)
    - `department_id` (`anyOf`, required)
    - `department_level` (`string|null`, required)
    - `dependencies` (`array<anyOf>`, required)
    - `description` (`string|null`, required)
    - `estimated_minutes` (`number|null`, required)
    - `icon` (`string`, required)
    - `is_client_accessible` (`boolean`, required)
    - `max_department_level` (`string|null`, required)
    - `name` (`string`, required)
    - `parent_stage_id` (`anyOf`, required)
    - `process_definition_id` (`string`, required)
    - `reassign_on_priority_change` (`boolean`, required)
    - `schema_version` (`string`, required)
    - `status_options` (`anyOf`, required)

## Responses

- `201` (`application/json`): Successful response.
  - Type: `object`
  - Properties:
    - `data` (`object`, required)
- `400` (`application/json`): Request validation failed (unknown or out-of-range parameters/properties are rejected).
  - Type: `object`
  - Properties:
    - `error` (`object`, required)
- `401` (`application/json`): Missing, invalid, expired, or revoked bearer token.
  - Type: `object`
  - Properties:
    - `error` (`string`, required)
    - `error_description` (`string`, required)
- `403` (`application/json`): The authenticated user does not have permission for this operation.
  - Type: `object`
  - Properties:
    - `error` (`object`, required)
- `404` (`application/json`): The requested resource was not found.
  - Type: `object`
  - Properties:
    - `error` (`object`, required)
- `409` (`application/json`): The request conflicts with an existing record or partially applied.
  - Type: `object`
  - Properties:
    - `error` (`object`, required)
- `429` (`application/json`): Per-tenant rate limit exceeded (600 requests/minute across all /v1 REST endpoints). The Retry-After header indicates how many seconds to wait.
  - Type: `object`
  - Properties:
    - `error` (`object`, required)
- `500` (`application/json`): An unexpected internal error occurred.
  - Type: `object`
  - Properties:
    - `error` (`object`, required)

## Authentication

- `bearerAuth` — http (bearer) — All /v1 endpoints (except `/v1/openapi.json` and `/v1/llms.txt`) require a bearer token. Two equal first-class paths: (1) an OAuth 2.0 access token from the au…

## Useful links

- Interactive page: https://www.agencytitan.com/docs/tag/stage-tools/POST/v1/process-definitions/{id}/stage-tools
- API reference home: https://www.agencytitan.com/docs/
- Tag page: https://www.agencytitan.com/docs/tag/stage-tools.md
- This operation as Markdown: https://www.agencytitan.com/docs/tag/stage-tools/POST/v1/process-definitions/{id}/stage-tools.md
- OpenAPI JSON: https://www.agencytitan.com/docs/openapi.json
- Full API Markdown: https://api.agencytitan.com/v1/llms.txt
- API keys: https://app.agencytitan.com/settings/api-mcp