AltText.ai MCP Server

AltText.ai MCP Server

Enables AI assistants to generate alt text, manage image libraries, and audit web pages for accessibility using the AltText.ai API.

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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

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