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40f01c123b
Adds a full-stack image description service: schema, base class,
OpenAI backend, gateway dispatch, client APIs (sync/async REST +
websocket), tg-describe-image CLI, IAM capability, and specs.
Closes #879
87 lines
3 KiB
YAML
87 lines
3 KiB
YAML
post:
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tags:
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- Flow Services
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summary: Image to text - describe images with a vision model
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description: |
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Describe an image using a vision-capable LLM.
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This is a **flow-scoped** service. It requires a flow instance
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and operates within the workspace associated with the
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authenticated bearer token.
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## Image-to-Text Overview
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Converts image content into a text description:
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- General image description ("what is in this picture?")
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- Targeted extraction via a custom prompt (objects, text, layout)
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- Behavior shaping via an optional system prompt
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## Request Fields
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- **image**: Base64-encoded image payload (raw binary is not accepted)
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- **mime_type**: Image MIME type, e.g. `image/png`, `image/jpeg`
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- **prompt**: Optional instruction; defaults to "Describe this image"
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- **system**: Optional system prompt for behavior and constraints
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## Token Counting
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Response includes token usage:
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- `in_token`: Input tokens (prompt + image)
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- `out_token`: Generated tokens
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- Useful for cost tracking and optimization
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## Availability
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Image-to-text is an optional service: it is only available in flows
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whose blueprint defines the `image-to-text` interface. Invoking it
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on a flow without the interface returns an error.
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operationId: imageToTextService
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security:
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- bearerAuth: []
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parameters:
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- name: flow
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in: path
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required: true
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schema:
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type: string
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description: Flow instance ID
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example: my-flow
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requestBody:
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required: true
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content:
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application/json:
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schema:
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$ref: '../../components/schemas/image-to-text/ImageToTextRequest.yaml'
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examples:
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basicDescription:
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summary: Basic image description with default prompt
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value:
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image: iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==
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mime_type: image/png
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targetedExtraction:
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summary: Targeted extraction with custom prompts
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value:
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image: iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==
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mime_type: image/png
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prompt: List all text visible in this image.
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system: You are an OCR assistant. Reply with the extracted text only.
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responses:
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'200':
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description: Successful response
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content:
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application/json:
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schema:
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$ref: '../../components/schemas/image-to-text/ImageToTextResponse.yaml'
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examples:
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imageDescription:
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summary: Image description with token usage
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value:
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description: A single blue pixel on a transparent background.
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in_token: 245
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out_token: 32
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model: gpt-5-mini
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'401':
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$ref: '../../components/responses/Unauthorized.yaml'
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'500':
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$ref: '../../components/responses/Error.yaml'
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