Multimodal AI

Image Captioning API

Create an image prompt extraction task and return the completed result.

MCP tool name

nexscope_image_captioning

MCP endpoint

https://api.nexscope.ai/mcp

JSON-RPC method

tools/call

Authentication

Use OAuth 2.1 Authorization Code with PKCE and the mcp:tools scope. API keys remain supported as a compatibility option.

Authorization: Bearer nk-xxxxxxxxxxxxxxxxx

If authentication fails, ask the user to open API Access and copy a valid key.

Call this MCP tool

Initialize an MCP 2025-11-25 Streamable HTTP session at https://api.nexscope.ai/mcp, then use tools/call.

{
  "jsonrpc": "2.0",
  "id": "image-captioning-1",
  "method": "tools/call",
  "params": {
    "name": "nexscope_image_captioning",
    "arguments": {
      "imageUrlList": [
        "https://example.com/product.jpg"
      ],
      "keyword": "phone case",
      "provider": "API_PRE_POINT",
      "type": 71
    }
  }
}

MCP 2025-11-25 · Streamable HTTP

Progress is delivered on the original POST SSE response. GET SSE carries notifications; reconnecting must query existing asynchronous work rather than submit again.

Asynchronous task workflow

1. Create once
Keep the returned taskId.
2. Query with backoff
Use nexscope_media_task_result after 5 seconds, then 10, 20, and 30 seconds.
3. Use final result
Stop at success, failure, or timeout.

{
  "jsonrpc": "2.0",
  "id": "image-captioning-result-1",
  "method": "tools/call",
  "params": {
    "name": "nexscope_media_task_result",
    "arguments": {
      "skillSlug": "image-captioning",
      "taskId": "TASK_ID_FROM_THE_GENERATION_RESULT"
    }
  }
}

Arguments

Name	Type	Required	Description
`type`	`integer`	required	Analysis type. Available options `5 (similar-image prompt)` `13 (scene prompt)` `30 (image-to-video analysis)` `69 (apparel selling points)` `71 (product selling points)` `73 (sales-video script)` `89 (video-reclone prompt)` Example: 71
`imageUrlList`	`array`	required	Public image URLs used for analysis. Provide no more than 6 images for modes that accept multiple images. Example: [ "https://example.com/product.jpg" ]
`keyword`	`string`	optional	Optional keyword context. Example: phone case
`provider`	`string`	optional	Analysis provider. Available options `API_PRE_POINT (default)` `API_LAYOUT_DESC` Example: API_PRE_POINT
`refVideoUrl`	`string`	optional	Reference video URL. Required when type is 89. Example: https://example.com/reference-video.mp4
`saleCountry`	`string`	optional	Target sale country code. Example: US
`targetLanguage`	`string`	optional	Target language for generated text. Used by video-reclone analysis. Example: English
`duration`	`integer`	optional	Target duration in seconds. Used by video-reclone analysis. Example: 15

Response fields

Treat structuredContent as the programmatic API response payload.

Name	Type	Required	Description
`code`	`integer`	required	0 means accepted or successful; nonzero is a platform error.
`cost`	`string`	required	Elapsed milliseconds, never credits; -1 outside web requests.
`data`	`any`	required	Data value used by this API operation.
`msg`	`string \| null`	required	Msg value used by this API operation.
`time`	`string`	required	Server local time: yyyy-MM-dd HH:mm:ss.
`traceId`	`string \| null`	required	Trace id value used by this API operation.
`ts`	`string`	required	Epoch milliseconds.

Any of option 1 — requires taskId, status, result

Name	Type	Required	Description
`data`	`object`	required	Data value used by this API operation.
`data.result`	`any`	required	Completed generation output retained from the task result. Fields vary by capability; generated resources use Nexscope-hosted URLs and any count represents charged Nexscope credits. This is the business output, not a task creation receipt.
`data.status`	`string`	required	Status value used by this API operation. Allowed: PENDING, RUNNING, SUCCEEDED, FAILED, TIMEOUT
`data.taskId`	`string`	required	Task id value used by this API operation.

Any of option 1

Name	Type	Required	Description
`data.result`	`object`	required	Completed generation output retained from the task result. Fields vary by capability; generated resources use Nexscope-hosted URLs and any count represents charged Nexscope credits. This is the business output, not a task creation receipt.

Any of option 2

Name	Type	Required	Description
`data.result`	`null`	required	Completed generation output retained from the task result. Fields vary by capability; generated resources use Nexscope-hosted URLs and any count represents charged Nexscope credits. This is the business output, not a task creation receipt.

Any of option 2

Name	Type	Required	Description
`data`	`null`	required	Data value used by this API operation.

Examples

Example arguments

{
  "imageUrlList": [
    "https://example.com/product.jpg"
  ],
  "keyword": "phone case",
  "provider": "API_PRE_POINT",
  "type": 71
}

Example structuredContent

{
  "code": 0,
  "cost": "-1",
  "data": {
    "result": null,
    "status": "PENDING",
    "taskId": "example-task"
  },
  "msg": null,
  "time": "2026-01-01 00:00:00",
  "traceId": null,
  "ts": "0"
}

IMPORTANT ASYNCHRONOUS TASK WORKFLOW

Image Captioning API

Authentication

Call this MCP tool

Asynchronous task workflow

Arguments

Response fields

Any of option 1 — requires taskId, status, result

Any of option 1

Any of option 2

Any of option 2

Examples

Example arguments

Example structuredContent

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