AltText.ai MCP Server

An MCP server that lets AI assistants generate alt text, manage image libraries, and audit web pages for accessibility using the AltText.ai API.

Works with Claude Desktop, Claude Code, Cursor, Windsurf, and any MCP-compatible client.

Setup

Requirements: Node.js 18+ and an AltText.ai API key

Add the server to your MCP client configuration:

{
  "mcpServers": {
    "alttext-ai": {
      "command": "npx",
      "args": ["-y", "@alttext_ai/alttext-mcp"],
      "env": {
        "ALTTEXT_API_KEY": "your-api-key"
      }
    }
  }
}

Where to add this:

Client	Config file
Claude Desktop	claude_desktop_config.json
Claude Code	.mcp.json in your project root
Cursor	MCP settings in the Cursor preferences
Windsurf	MCP settings in the Windsurf preferences

Tools

Account Management

Tool	Description
get_account	Check your credit balance, usage, and account settings.
update_account	Update account name, webhook URL, or notification email.

Generate Alt Text

Tool	Description
generate_alt_text	Generate alt text for an image URL. Supports multilingual output, custom prompts, keywords, and character limits. Costs 1 credit.
generate_alt_text_from_file	Generate alt text from a local image file. Automatically base64-encodes and uploads. Costs 1 credit.
translate_image	Add alt text in a new language for an existing image (by asset_id). Costs 1 credit.

Manage Image Library

Tool	Description
list_images	List images in your library with pagination.
search_images	Search your image library by alt text content.
get_image	Get details for a specific image by asset ID.
update_image	Update alt text, tags, or metadata for an image.
delete_image	Delete an image from your library.

Bulk Operations

Tool	Description
bulk_create	Bulk generate alt text from a CSV file with image URLs and optional metadata.
scrape_page	Scan a web page, find images missing alt text, and queue generation. Results are async -- use list_images to check progress.

Example Prompts

Once configured, just ask your AI assistant:

Account & Credits

• "How many credits do I have left?"
• "Update my webhook URL to https://example.com/webhook"

Generate Alt Text

• "Generate alt text for https://example.com/photo.jpg"
• "Generate alt text for this image" (with local file)
• "Generate alt text in French and Spanish for this image"
• "Translate image abc123 to German"

Manage Library

• "Search my images for 'product photo'"
• "List my images"
• "Get details for image abc123"
• "Update the alt text for asset abc123"
• "Delete image xyz789"

Bulk Operations

• "Scan https://example.com for images missing alt text"
• "Process this CSV file of image URLs" (bulk_create)

Environment Variables

Variable	Required	Description
ALTTEXT_API_KEY	Yes	Your AltText.ai API key
ALTTEXT_API_BASE_URL	No	Override the API base URL (default: https://alttext.ai/api/v1)

Development

npm install
npm run build
npm test
npm run lint

Tests use mocked fetch calls -- no API key or network access needed.

License

MIT