avc-test-js-mcp (Node.js)

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A video enhancement, image enhancement, and image segmentation service based on the MCP protocol, acting as an MCP Client-Server to interact with backend HTTP Servers.

Features

Provides the following MCP Tools:

Video Enhancement

• create_task - Create a video enhancement task (supports URL or local file upload)

• get_task_status - Query task status

• enhance_video_sync - Synchronously enhance video (blocking wait, truncated at ~50s by default)

Image Enhancement

• enhance_image_sync - Enhance image quality and optimize faces (supports URL or local file upload)

• colorize_image_sync - Colorize black-and-white photos (supports URL or local file upload)

• denoise_image_sync - Remove noise from images (supports URL or local file upload)

• get_image_task_status - Query image task status (for polling after sync timeout)

Image Segmentation (SAM3)

• sam3_predict - SAM3 image segmentation (supports local path, URL, or Base64 image)

• get_sam3_task_status - Query SAM3 task status (for polling after sync timeout)

Related MCP server: avc-test-py-mcp

Prerequisites

• Node.js >= 18 (check: node --version)

• API Key (required for authentication)

Lazy Install (Recommended)

If your AI Agent has a known MCP config path, just copy the line below and send it to your AI:

Install the npm package avc-test-js-mcp as an MCP server. My API Key is: sk-xxxxxxxx.

The AI will automatically:

1. Detect your MCP client

2. Find the config file path

3. Write the correct configuration

4. Prompt you to restart the client

Manual Install

No installation needed. Use npx directly in your MCP client config.

1. Claude Code (CLI)

Run in Claude Code:

/mcp

Check the output for the "User MCPs" section to find the config file path, then edit that file.

Common paths (if /mcp is unavailable):

• Windows: %USERPROFILE%\.claude.json

• macOS: ~/.claude.json

• Linux: ~/.claude.json

• Legacy/Alternative: ~/.claude/mcp.json

Paste this (replace your-api-key):

{
  "mcpServers": {
    "video-enhancement": {
      "command": "npx",
      "args": ["-y", "avc-test-js-mcp@latest"],
      "env": {
        "API_KEY": "your-api-key"
      }
    }
  }
}

Save and run /mcp to verify it's loaded.

2. Cursor

Go to Settings > Tools & MCPs > Add New MCP Server:

• Name: video-enhancement

• Type: command

• Command:

  env API_KEY=your-api-key npx -y avc-test-js-mcp@latest

Or edit ~/.cursor/mcp.json:

{
  "mcpServers": {
    "video-enhancement": {
      "command": "npx",
      "args": ["-y", "avc-test-js-mcp@latest"],
      "env": {
        "API_KEY": "your-api-key"
      }
    }
  }
}

Verify Installation

After restarting your client, check if the tools are available:

1. Ask: "What tools do you have available?"

2. You should see: create_task, get_task_status, enhance_video_sync, enhance_image_sync, colorize_image_sync, denoise_image_sync, get_image_task_status, sam3_predict, get_sam3_task_status

Configuration Options

Custom Endpoint

{
  "env": {
    "HTTP_API_BASE_URL": "https://your-endpoint.com",
    "API_KEY": "your-api-key",
    "SAM3_API_BASE_URL": "https://your-sam3-endpoint.com"
  }
}

Or via CLI args:

npx -y avc-test-js-mcp@latest --base-url https://your-endpoint.com --api-key your-api-key --sam3-base-url https://your-sam3-endpoint.com

Recommended Workflow

This project provides both synchronous and asynchronous modes.

Because MCP Agents typically enforce a ~60-second timeout per tool call, tasks with longer processing times (video enhancement) are strongly recommended to use asynchronous mode:

Asynchronous Mode (Recommended)

Video Enhancement:

1. Call create_task to create a task → immediately get task_id

2. Wait a few seconds, then call get_task_status to query the status

3. If status is processing, continue waiting and repeat step 2

4. If status is completed, the task is done and the result contains video_url

5. If status is failed, the task failed and the result contains error_message

Synchronous Mode (Simple Scenarios)

Video Enhancement:

• Call enhance_video_sync → the server polls internally

• Defaults to a maximum wait of 50 seconds

• If completed within 50 seconds, returns the result directly

• If not completed within 50 seconds, returns task_id and instructions for the Agent to switch to get_task_status

Image Segmentation (SAM3):

• Call sam3_predict → the server polls internally

• Defaults to a maximum wait of 50 seconds (25 attempts × 2-second polling interval)

• If completed within 50 seconds, returns the segmentation result directly

• If not completed within 50 seconds, returns a truncation notice indicating the task is still processing

Usage Examples

Once configured, ask your AI agent naturally:

"Enhance this video to 1080p: https://example.com/video.mp4"

"Improve the quality of /Users/me/Desktop/video.mp4 to 2k"

"Enhance this image: https://example.com/photo.jpg"

"Colorize this black-and-white photo: /Users/me/Desktop/old_photo.png"

"Remove noise from this image: C:\Users\xxx\noisy.jpg"

"Analyze this image and find all objects: C:\Users\xxx\photo.png"

"Use SAM3 to segment this image, prompt: 'find all cars'"

The agent will automatically choose the right tool based on your request.

Image Enhancement Usage Examples

Example 1: Enhance an image via URL (simplest)

Just tell the agent:

"Enhance this image: https://example.com/blurry-photo.jpg"

The agent will call enhance_image_sync with:

{
  "image_source": "https://example.com/blurry-photo.jpg",
  "type": "url"
}

Default: type="url", scale=2, poll_interval=5, timeout=50. No need to specify any extra parameters.

Example 2: Enhance a local image with 4x upscaling

"Enhance this photo to 4x resolution: D:\photos\family.jpg"

The agent will call enhance_image_sync with:

{
  "image_source": "D:\\photos\\family.jpg",
  "type": "local",
  "scale": 4
}

scale=4 means the image will be upscaled by 4x. The MCP Server auto-uploads the local file to TOS.

Example 3: Colorize a B&W photo with custom timeout

"Colorize this black-and-white photo, it can take a bit longer: /Users/me/Desktop/old_photo.png"

The agent may call colorize_image_sync with a longer timeout:

{
  "image_source": "/Users/me/Desktop/old_photo.png",
  "type": "local",
  "timeout": 55
}

timeout=55 means the tool will wait up to 55 seconds before truncating.

Example 4: Denoise a noisy photo with faster polling

"Remove the noise from this image: https://example.com/noisy.jpg"

The agent will call denoise_image_sync:

{
  "image_source": "https://example.com/noisy.jpg",
  "type": "url",
  "poll_interval": 3,
  "timeout": 50
}

poll_interval=3 means check every 3 seconds (faster than the default 5 seconds).

Example 5: Timeout truncation → manual polling

If a tool times out (50 seconds not enough), you'll get:

{
  "success": true,
  "status": "processing",
  "task_id": "img_abc123",
  "message": "Task is still processing (waited 50 seconds). Please use get_image_task_status to continue polling.",
  "note": "The synchronous wait for this long-running task has been truncated. Switch to get_image_task_status polling."
}

Then ask the agent:

"Check the status of task img_abc123"

The agent will call get_image_task_status:

{
  "task_id": "img_abc123"
}

Repeat until status becomes "completed" or "failed".

Parameter Combination Reference

Provided Tools

Video Enhancement

create_task

Create an asynchronous video enhancement task.

Recommended for most use cases. Ideal for longer videos (over 10 seconds) to avoid timeouts and blocking the connection.

Returns:

{
  "success": true,
  "task_id": "xxx",
  "status": "processing"
}

get_task_status

Query video enhancement task status.

The returned status field can be: processing, completed, or failed. If status is processing, you need to wait a few seconds and call this tool again.

Returns:

{
  "success": true,
  "task_id": "xxx",
  "status": "completed",
  "progress": 100,
  "video_url": "https://...",
  "message": "Task is still processing, please check again later"
}

The message field only appears when status is processing, prompting the Agent to continue waiting.

enhance_video_sync

Synchronously enhance video (blocks until completion).

Best for short videos (estimated processing time < 1 minute). If the task is not completed within 50 seconds, the tool returns early with a task_id, and you need to use get_task_status to continue querying.

Truncated return example (not completed within 50s):

{
  "success": true,
  "status": "processing",
  "task_id": "xxx",
  "message": "Task is still processing (waited 50 seconds). Please use get_task_status to continue polling.",
  "note": "The synchronous wait for this long-running task has been truncated. Switch to get_task_status polling."
}

Image Enhancement

Three image processing tools are provided, each targeting a specific use case:

All three tools share the same parameters and behavior pattern. They are synchronous — the tool blocks until the image is processed or the timeout is reached.

Supported image formats: PNG, JPG, JPEG, BMP, WebP, etc.

Two upload methods:

1. URL upload: provide a publicly accessible image URL (type: "url")

2. Local upload: provide a local file path, the MCP Server auto-uploads to TOS object storage (type: "local", max file size: 100MB)

enhance_image_sync

Synchronously enhance an image to improve quality and optimize faces.

The tool internally creates a task and polls for the result. If processing completes within the timeout (default 50s), the result is returned directly. If not, the tool returns early with a task_id — use get_image_task_status to continue polling.

Normal completion return:

{
  "success": true,
  "task_id": "xxx",
  "status": "completed",
  "progress": 100,
  "image_url": "https://..."
}

Truncated return (not completed within 50s):

{
  "success": true,
  "status": "processing",
  "task_id": "xxx",
  "message": "Task is still processing (waited 50 seconds). Please use get_image_task_status to continue polling.",
  "note": "The synchronous wait for this long-running task has been truncated. Switch to get_image_task_status polling."
}

colorize_image_sync

Synchronously colorize a black-and-white photo with AI.

Best for old black-and-white photos. The AI will add realistic colors to the image. Supports the same parameters and return format as enhance_image_sync.

Returns: Same format as enhance_image_sync.

denoise_image_sync

Synchronously remove noise from an image.

Best for grainy/noisy photos taken in low-light conditions or with high ISO settings. Supports the same parameters and return format as enhance_image_sync.

Returns: Same format as enhance_image_sync.

get_image_task_status

Query image processing task status. Used to poll for results when a sync tool times out.

The returned status field can be: processing, completed, or failed. If status is processing, wait a few seconds and call this tool again.

Returns:

{
  "success": true,
  "task_id": "xxx",
  "status": "completed",
  "progress": 100,
  "image_url": "https://...",
  "message": "Task is still processing, please check again later"
}

The message field only appears when status is processing, prompting the Agent to continue waiting.

Recommended Workflow for Image Tools

1. For most images: Call enhance_image_sync / colorize_image_sync / denoise_image_sync directly — the tool handles everything and returns the result

2. If truncated: The tool returns a task_id, then use get_image_task_status to poll until status becomes completed or failed

3. If failed: Check the error_message field for details

Image Segmentation (SAM3)

sam3_predict

Analyze an image using the SAM3 segmentation API to generate inference results (masks, boxes, scores).

Parameters:

Image input (choose one, must provide exactly one):

• imagePath (string): Absolute path of a local image file. Supports common formats (PNG, JPG, JPEG).

  • Example: "C:\\Users\\xxx\\photo.png", "/home/user/images/cat.jpg"

  • Use when: The user explicitly provides a local file path

• imageUrl (string): Publicly accessible URL of the image.

  • Example: "https://example.com/photo.jpg"

  • Use when: The image is already online and the user provides a link

  • Note: The URL must be publicly accessible. Links requiring login or signatures are not supported

• imageBase64 (string): Base64-encoded image data.

  • Example: "iVBORw0KGgoAAAANSUhEUgAA..."

  • Use when: The user drags or uploads an image attachment, and the Agent encodes it as base64

  • Note: Large images will produce very large base64 strings, which may slow transmission

Other parameters:

• prompt (string, required): English text prompt specifying the target object to segment. Since the SAM3 model only accepts English prompts, provide an English description. If the user provides Chinese or other non-English text, the Agent will automatically translate it before calling the tool.

Normal completion return:

After inference completes, returns a JSON string containing three fields:

• masks: 2D array. Each element is a binary mask (values 0 or 1) with the same dimensions as the input image, marking the pixel-level location of detected objects. The i-th mask corresponds to the i-th detected object instance.

• boxes: 2D array. Each element is a bounding box in [x1, y1, x2, y2] format, representing the rectangular region of the detected object. x1, y1 are the top-left coordinates; x2, y2 are the bottom-right coordinates.

  Coordinate system: The top-left corner of the image is the origin (0, 0). The x-axis increases to the right, and the y-axis increases downward, in pixels. For example, [120, 80, 300, 450] means the region starts 120px from the left edge and 80px from the top edge, extending to 300px from the left and 450px from the top. Width = x2 - x1 = 180px, Height = y2 - y1 = 370px.

• scores: 1D array. Each element is a confidence score for the corresponding detection result, ranging from 0 to 1. Higher scores indicate greater model confidence.

Example result JSON:

{
  "masks": [
    [[0, 0, 1, ...], [0, 1, 1, ...], ...],
    [[0, 0, 0, ...], [0, 0, 1, ...], ...]
  ],
  "boxes": [
    [120, 80, 300, 450],
    [400, 200, 600, 500]
  ],
  "scores": [0.95, 0.87]
}

Truncated return example (not completed within 50s):

{
  "success": true,
  "status": "processing",
  "task_id": "xxx",
  "message": "Task is still processing (waited about 50 seconds). Please retry later or record this task_id for manual follow-up.",
  "note": "The synchronous wait for this long-running task has been truncated."
}

get_sam3_task_status

Query SAM3 segmentation task status. Used to poll for results when sam3_predict times out.

The returned status field can be: processing, completed, or failed. If status is processing, wait a few seconds and call this tool again.

Completed return:

{
  "success": true,
  "task_id": "xxx",
  "status": "completed",
  "result_url": "https://..."
}

Processing return:

{
  "success": true,
  "task_id": "xxx",
  "status": "processing",
  "message": "Task is still processing, please check again later."
}

Failed return:

{
  "success": false,
  "task_id": "xxx",
  "status": "failed",
  "error": "Task failed"
}

Recent Updates

v0.4.x - Image Enhancement

• Image Enhancement (enhance_image_sync) - Enhance image quality and optimize faces, supports 2x/4x upscaling

• Image Colorization (colorize_image_sync) - Colorize black-and-white photos with AI

• Image Denoising (denoise_image_sync) - Remove noise from low-light/high-ISO photos

• All image tools support both URL and local file upload (auto-upload to TOS)

FAQ

Agent reports timeout when calling tools?

This is the primary issue this project addresses. MCP Agents (such as Claude, Cursor) typically enforce a ~60-second timeout per tool call. If task processing exceeds this limit, the Agent will error and disconnect.

Solutions:

1. Prefer asynchronous tools: For video enhancement and other time-consuming tasks, always use create_task + get_task_status. These tools return instantly on each call and will not trigger timeouts.

2. Sync tool truncation mechanism: enhance_video_sync has an internal 50-second truncation limit. If the task is not completed within 50 seconds, the tool proactively returns a task_id and instructs the Agent to use get_task_status to follow up.

3. SAM3 truncation mechanism: sam3_predict defaults to 25 polling attempts (~50 seconds). If the task is not completed, it returns a truncation notice indicating the task is still processing.

4. Adjust SAM3 polling parameters (advanced): If you are confident that SAM3 tasks are usually fast (e.g., under 10 seconds), you can increase polling attempts via environment variable:

   SAM3_POLL_MAX_ATTEMPTS=60

   But ensure the total wait time does not exceed your Agent's timeout limit.

Drag-and-drop attachment says file not found?

This is a known limitation of stdio MCP. When dragging or uploading an attachment through the Agent interface, the file path is usually not automatically passed to the MCP Server.

Solutions:

1. Provide the path simultaneously (recommended): After dragging the image, provide the local absolute path in your message:

   "Please analyze this image D:\\photos\\cat.jpg and find the cat"

2. Wait for auto-encoding: Claude may automatically encode the image as base64. If successful, no extra action is needed.

3. Reply to path inquiry: If Claude asks for the image path, simply reply with the local absolute path.

Is there a priority among the three input methods?

There is no strict priority. Claude will automatically choose the most appropriate method based on conversation context:

• You provided a local path → uses imagePath

• You provided a web link → uses imageUrl

• You dragged an attachment without a path → tries imageBase64

What image formats are supported?

Common formats: PNG, JPG, JPEG, BMP, WebP, etc. PNG or JPG is recommended.

What if URL image download fails?

Ensure the URL is publicly accessible, requiring no login, cookies, or signatures. If the image is on a service requiring authentication (e.g., private S3 Bucket, login-required image host), download it locally first and use imagePath.

What if the base64 image is too large?

If the image is very large (e.g., 4K resolution), the base64-encoded data will be very large and may slow transmission. Suggestions:

1. Use imagePath instead

2. Or compress the image before encoding

File Upload Notes

When type is "local":

1. File is read locally by the MCP Server

2. Uploaded directly to TOS object storage via pre-signed URL

3. Max file size: 100MB (video and image)

Troubleshooting

"command not found: npx"

Install Node.js >= 18: https://nodejs.org/

"Error: --api-key argument or API_KEY environment variable is required"

Your API Key is missing. Double-check the env.API_KEY in your config.

MCP Server shows red/error in client

Check logs:

• Claude Desktop macOS: ~/Library/Logs/Claude/mcp*.log

• Claude Desktop Windows: %APPDATA%\Claude\logs\mcp*.log

• Cursor: Output panel > MCP

"TOS upload failed"

Usually a signature mismatch. Ensure your HTTP_API_BASE_URL and API_KEY are correct and active.

Global Install (Alternative)

If you prefer not using npx every time:

npm install -g avc-test-js-mcp

Then use "command": "avc-test-js-mcp" with "args": ["--api-key", "your-api-key"] in your config.

License

MIT License - See LICENSE file for details