ICF Server (Cloudflare Workers)

A Model Context Protocol (MCP) server for the WHO International Classification of Functioning, Disability and Health (ICF), deployed on Cloudflare Workers for global edge availability.

Live URL: https://mcp-icf.medseal.app/mcp

What is ICF?

The ICF is a WHO classification that complements ICD (diagnosis codes) by describing how health conditions affect a person's functioning in daily life:

• Body Functions (b) - Physiological and psychological functions
• Body Structures (s) - Anatomical parts of the body
• Activities and Participation (d) - Task execution and life involvement
• Environmental Factors (e) - Physical, social, and attitudinal environment

Tool

A single icf tool with action dispatch (token-efficient). 19 actions:

Codes & Hierarchy

Action	Description
lookup	Look up a specific ICF code (e.g., b280, d450)
search	Search by keyword (e.g., "walking difficulty", "pain")
browse	Browse a category (b, s, d, e) or sub-chapter (b1, d4, e3)
children	Get subcategories of a code
parent	Navigate up to a code's parent category
siblings	Codes at the same level (same parent)
chain	Full hierarchy path from root to a code
profile	Build a functional profile from multiple codes

Qualifiers

Action	Description
qualifier	Component-specific qualifier reference (b=1, s=3, d=2, e=barrier/facilitator)
validate	Validate code format + qualifiers, verify existence in the WHO API
parse	Parse fully qualified codes (d450.23, s730.312, e120+3)

Clinical Assessment Instruments

11 standardized RPM instruments with items, scoring, and ICF mappings: GAD-7, PHQ-9, RADAI-5, SLEDAI-2K, WHODAS 2.0, HAQ-DI, PROMIS-10, CAT, ODI, NRS Pain, Short FES-I.

Action	Description
instruments	List instruments, optionally filtered by domain
instrument	Full spec: items, response options, scoring, ICF mappings
score	Score responses → severity, interpretation, ICF qualifier
suggest	Suggest instruments for a condition, ICF code, or domain
mapping	Show an instrument's ICF code mappings

Meta

Action	Description
overview	Full ICF classification overview
api	Raw WHO API request (escape valve)
help	Action reference with examples

Example call:

{"action": "score", "name": "GAD-7", "responses": [1, 2, 1, 0, 1, 2, 1]}

Instrument and qualifier actions are pure logic and work without WHO API credentials; code/hierarchy actions require them.

Prerequisites

1. WHO ICD-API credentials (free): Register at https://icd.who.int/icdapi
2. Cloudflare account with Workers enabled
3. Node.js 18+ and npm

Installation

git clone https://github.com/stayce/icf-mcp-cloudflare.git
cd icf-mcp-cloudflare
npm install

Configuration

1. Copy the example environment file:

   cp .dev.vars.example .dev.vars
   

2. Edit .dev.vars with your WHO API credentials for local development.

3. For production, set secrets:

   wrangler secret put WHO_CLIENT_ID
   wrangler secret put WHO_CLIENT_SECRET
   

Development

npm run dev

The server will be available at http://localhost:8787.

Testing

npm test

Regression tests cover instrument scoring (all 11 instruments) and qualifier parsing — pure logic, no WHO API credentials needed.

Deployment

npm run deploy

For custom domain (configured in wrangler.toml):

wrangler deploy --env production

Usage with Claude

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "icf": {
      "type": "url",
      "url": "https://mcp-icf.medseal.app/mcp"
    }
  }
}

Or if deploying your own:

{
  "mcpServers": {
    "icf": {
      "type": "url",
      "url": "https://your-worker.workers.dev/mcp"
    }
  }
}

Endpoints

• / or /health - Health check / server info
• /mcp - MCP protocol endpoint (streamable HTTP)

API Reference

This server uses the WHO ICD-API which provides programmatic access to both ICD-11 and ICF classifications.

• API Documentation: https://icd.who.int/docs/icd-api/APIDoc-Version2/
• ICF Browser: https://icd.who.int/dev11/l-icf/en

License

MIT License - see LICENSE

Related

• icf-mcp-server - Python version for Claude Desktop