> ## Documentation Index
> Fetch the complete documentation index at: https://docs.e6data.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Start run

> start run. POST /api/v1/workloads/{workload_id}/runs. Submit a workload run; poll get_run and list_tasks. Reuse submission_id on retry. Assistant calls must include expected_revisi

ReferenceApplies to: Unified engine deployments

## Related guidance

[Addresses and access](https://docs.e6data.com/transformation/http/access.md) · [Request identity](https://docs.e6data.com/transformation/http/request-identity.md) · [Errors and recovery](https://docs.e6data.com/transformation/http/errors.md) · [Pagination and results](https://docs.e6data.com/transformation/http/results.md)


## OpenAPI

````yaml openapi/transformation.json POST /api/v1/workloads/{workload_id}/runs
openapi: 3.1.0
info:
  description: >-
    HTTP contracts for the Unified engine. Requests use the connected
    deployment's access model and configured owner. Response examples are
    illustrative; inspect your engine response in your client. SQL-managed
    secrets, credentials, streaming pipelines and maintenance run through
    session operations.
  title: Laminar Unified HTTP API
  version: v1
servers:
  - url: https://engine.example.com
    description: >-
      Example engine origin. Replace it with your deployment URL and any API
      mount prefix.
security: []
paths:
  /api/v1/workloads/{workload_id}/runs:
    post:
      tags:
        - Workloads
      summary: start run
      description: >-
        start run. POST /api/v1/workloads/{workload_id}/runs. Submit a workload
        run; poll get_run and list_tasks. Reuse submission_id on retry.
        Assistant calls must include expected_revision from the current
        get_workload response.
      operationId: start_run
      parameters:
        - in: path
          name: workload_id
          required: true
          schema:
            format: uuid
            type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: >-
                #/components/schemas/Input_app_api_src_models_rs_RunCreateRequest
        required: true
      responses:
        '202':
          content:
            application/json:
              example:
                submission_id: 44444444-4444-4444-8444-444444444444
                workload_id: 22222222-2222-4222-8222-222222222222
                workload_run_id: 33333333-3333-4333-8333-333333333333
              schema:
                $ref: >-
                  #/components/schemas/kernel_scheduler_src_runs_model_rs_WorkloadRunStartResponse
          description: Accepted. Follow the returned identity to inspect completion.
        default:
          content:
            application/json:
              example:
                error:
                  code: invalid_request
                  message: Check the request fields
              schema:
                $ref: '#/components/schemas/ApiError'
          description: A rejected or failed request. Inspect error.code before retrying.
components:
  schemas:
    Input_app_api_src_models_rs_RunCreateRequest:
      additionalProperties: false
      properties:
        data_window:
          anyOf:
            - $ref: >-
                #/components/schemas/Input_shared_common_src_workflow_rs_DataWindow
            - type: 'null'
        expected_revision:
          anyOf:
            - minimum: 0
              type: integer
            - type: 'null'
        parameters:
          $ref: >-
            #/components/schemas/Input_shared_common_src_parameters_rs_ParameterValues
        submission_id:
          $ref: '#/components/schemas/Input_shared_common_src_lib_rs_SubmissionId'
        xray:
          type: boolean
      required:
        - submission_id
      type: object
    kernel_scheduler_src_runs_model_rs_WorkloadRunStartResponse:
      properties:
        submission_id:
          $ref: '#/components/schemas/shared_common_src_lib_rs_SubmissionId'
        workload_id:
          $ref: '#/components/schemas/shared_common_src_lib_rs_WorkloadId'
        workload_run_id:
          $ref: '#/components/schemas/shared_common_src_lib_rs_WorkloadRunId'
      required:
        - workload_id
        - workload_run_id
        - submission_id
      type: object
    ApiError:
      properties:
        error:
          properties:
            code:
              type: string
            message:
              type: string
          required:
            - code
            - message
          type: object
      required:
        - error
      type: object
    Input_shared_common_src_workflow_rs_DataWindow:
      additionalProperties: false
      properties:
        end_unix_millis:
          type: integer
        start_unix_millis:
          type: integer
        timezone:
          type: string
      required:
        - start_unix_millis
        - end_unix_millis
        - timezone
      type: object
    Input_shared_common_src_parameters_rs_ParameterValues:
      additionalProperties:
        description: JSON value; fields depend on the enclosing document or provider.
      type: object
    Input_shared_common_src_lib_rs_SubmissionId:
      format: uuid
      type: string
    shared_common_src_lib_rs_SubmissionId:
      format: uuid
      type: string
    shared_common_src_lib_rs_WorkloadId:
      format: uuid
      type: string
    shared_common_src_lib_rs_WorkloadRunId:
      format: uuid
      type: string

````

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