MCP for IIIF Images

A Model Context Protocol (MCP) server for working with IIIF (International Image Interoperability Framework) manifests and images. See this video for a demonstration.

Features

This MCP server contains the following tools:

• fetch_iiif_manifest: Fetch a IIIF manifest from a URL. (Note that clients may have difficulty processing large amounts of JSON.)

• fetch_iiif_image: Retrieve a IIIF image from a base URI, fetching info.json and returning the image data (default: max 1500px dimension, max 800,000 pixels total)

• fetch_iiif_image_region: Retrieve a specific region of a IIIF image using percentage coordinates, with the region scaled to fit within the same constraints

Caveats

• The code scales the images to dimensions acceptable to Claude. It will not work with a Level 0 Image API implementation.

• Claude may not process some IIIF Manifests due to the size of the file.

Claude Desktop Configuration

Install from Claude Desktop Extension (DXT) file

1. Install and log in to Claude Desktop

2. Download the .dxt file from the latest release

3. Double-click the .dxt file

4. Install the extension when prompted by Claude

Install from Source Code

1. Clone this repository

2. Install dependencies: npm install

3. Make the server executable: chmod +x server/server.js

To use this MCP server with Claude Desktop, add the following configuration to your Claude Desktop config file. Adjust the file path as necessary. You may also need to provide the full path to your node command.

macOS

Edit ~/Library/Application Support/Claude/claude_desktop_config.json:

Windows

Edit %APPDATA%\Claude\claude_desktop_config.json:

Linux

Edit ~/.config/Claude/claude_desktop_config.json:

General MCP Usage

The server supports two transport modes:

Standard Mode (stdio)

Run the server using stdio transport (default):

HTTP Streaming Mode

Run the server using HTTP streaming transport:

Command-line Options

• --http: Use HTTP streaming transport instead of stdio

• --port PORT: Port number for HTTP server (default: 3000)

• --help: Show help message

When using HTTP mode, the server will start an HTTP server with the following endpoints:

• GET /sse: Establish Server-Sent Events connection

• POST /messages?sessionId=<id>: Send MCP messages

HTTP Streaming Mode

For HTTP streaming mode, you'll need to start the server manually with the --http flag and then configure Claude Desktop to connect via HTTP:

Then configure Claude Desktop to use the HTTP transport (refer to Claude Desktop documentation for HTTP transport configuration).

Note: Update the path in the args array to match the actual location where you've installed this server.

After updating the configuration, restart Claude Desktop for the changes to take effect.

Testing

To run the tests:

The project uses Vitest as the testing framework, which provides:

• Fast execution with ES modules support

• Jest-compatible API with better error messages

• Built-in coverage reporting

• Watch mode for development

Available Tools

fetch_iiif_manifest

Fetches and validates a IIIF manifest from a URL.

Parameters:

• url (required): The URL of the IIIF manifest to fetch

Example usage:

fetch_iiif_image

Retrieve a IIIF image from a base URI, fetching info.json and returning the image data.

Parameters:

• baseUri (required): Base URI of the IIIF Image API resource (without /info.json)

Example usage:

fetch_iiif_image_region

Retrieve a specific region of a IIIF image using percentage coordinates, with the region scaled to fit within the same constraints. Use this to fetch regions of interest at higher detail for more accurate image description and analysis.

Parameters:

• baseUri (required): Base URI of the IIIF Image API resource (without /info.json)

• region (required): Region in pct: format (e.g., 'pct:20,20,50,50' for x,y,width,height as percentages)

Example usage:

Note that you can use these tools together in the course of a conversation, for example: