post:
  tags:
    - Flow Services
  summary: Prompt service - template-based generation
  description: |
    Execute stored prompt templates with variable substitution.

    ## Prompt Service Overview

    The prompt service enables:
    - Reusable prompt templates stored in configuration
    - Variable substitution for dynamic prompts
    - Consistent prompt engineering across requests
    - Text or structured object outputs

    ## Template System

    Prompts are stored via config service (`/api/v1/config`) with:
    - **id**: Unique prompt identifier
    - **template**: Prompt text with `{variable}` placeholders
    - **system**: Optional system prompt
    - **output_format**: "text" or "object"

    Example template:
    ```
    Summarize the following document in {max_length} words:

    {document}
    ```

    ## Variable Substitution

    Two ways to pass variables:

    1. **terms** (explicit JSON strings):
       ```json
       {
         "terms": {
           "document": "\"Text here...\"",
           "max_length": "\"200\""
         }
       }
       ```

    2. **variables** (auto-converted):
       ```json
       {
         "variables": {
           "document": "Text here...",
           "max_length": 200
         }
       }
       ```

    ## Output Types

    - **text**: Plain text response in `text` field
    - **object**: Structured JSON in `object` field (as string)

    ## Streaming

    Enable `streaming: true` to receive response incrementally.

    ## Use Cases

    - Document summarization
    - Entity extraction
    - Classification tasks
    - Data transformation
    - Any repeatable LLM task with consistent prompting

  operationId: promptService
  security:
    - bearerAuth: []
  parameters:
    - name: flow
      in: path
      required: true
      schema:
        type: string
      description: Flow instance ID
      example: my-flow
  requestBody:
    required: true
    content:
      application/json:
        schema:
          $ref: '../../components/schemas/prompt/PromptRequest.yaml'
        examples:
          withTerms:
            summary: Using terms (JSON strings)
            value:
              id: summarize-document
              terms:
                document: '"This document discusses quantum computing, covering qubits, superposition, and entanglement. Applications include cryptography and optimization."'
                max_length: '"50"'
          withVariables:
            summary: Using variables (auto-converted)
            value:
              id: extract-entities
              variables:
                text: A paper by Einstein on relativity published in 1905.
                entity_types: ["person", "year", "topic"]
          streaming:
            summary: Streaming response
            value:
              id: generate-report
              variables:
                data: {revenue: 1000000, growth: 15}
                format: executive summary
              streaming: true
  responses:
    '200':
      description: Successful response
      content:
        application/json:
          schema:
            $ref: '../../components/schemas/prompt/PromptResponse.yaml'
          examples:
            textResponse:
              summary: Text output
              value:
                text: This document provides an overview of quantum computing fundamentals and cryptographic applications.
                end-of-stream: false
            objectResponse:
              summary: Structured output
              value:
                object: '{"entities": [{"type": "person", "value": "Einstein"}, {"type": "year", "value": "1905"}, {"type": "topic", "value": "relativity"}]}'
                end-of-stream: false
            streamingChunk:
              summary: Streaming chunk
              value:
                text: This document provides an overview
                end-of-stream: false
            streamingComplete:
              summary: Streaming complete
              value:
                text: ""
                end-of-stream: true
    '401':
      $ref: '../../components/responses/Unauthorized.yaml'
    '500':
      $ref: '../../components/responses/Error.yaml'