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

# Start issue review

> Set status to in_progress and assign the acting user when the issue is unassigned, in one atomic write. An existing assignee is preserved; an issue already in progress is returned unchanged.



## OpenAPI

````yaml https://api.uselemma.ai/openapi.json patch /issues/{issue_id}/start-review
openapi: 3.1.0
info:
  title: Lemma Platform API
  description: Lemma Platform HTTP API for AI observability and workspace operations.
  version: 0.1.0
servers:
  - url: https://api.uselemma.ai
    description: Lemma production API
security:
  - bearerAuth: []
paths:
  /issues/{issue_id}/start-review:
    patch:
      tags:
        - Issues
      summary: Start issue review
      description: >-
        Set status to in_progress and assign the acting user when the issue is
        unassigned, in one atomic write. An existing assignee is preserved; an
        issue already in progress is returned unchanged.
      operationId: start_issue_review
      parameters:
        - name: issue_id
          in: path
          required: true
          description: Issue ID.
          schema:
            type: string
      responses:
        '200':
          description: Issue moved into review
          content:
            application/json:
              schema:
                type: object
                properties:
                  project_id:
                    type: string
                  status:
                    type: string
                    enum:
                      - open
                      - in_progress
                      - resolved
                      - dismissed
                  assignee_user_id:
                    type:
                      - string
                      - 'null'
                required:
                  - project_id
                  - status
                  - assignee_user_id
                additionalProperties: false
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
                  code:
                    type: string
                required:
                  - detail
                additionalProperties: false
        '404':
          description: Not found
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
                  code:
                    type: string
                required:
                  - detail
                additionalProperties: false
        '409':
          description: Conflict
          content:
            application/json:
              schema:
                type: object
                properties:
                  detail:
                    type: string
                  code:
                    type: string
                    enum:
                      - issue_terminal_conflict
                      - issue_concurrent_conflict
                required:
                  - detail
                  - code
                additionalProperties: false
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer

````