monday-graphql-mcp

An MCP server that helps developers build on the monday.com GraphQL API — query validation, column value formats, error explanations, live schema introspection, and code scaffolding, all from your AI assistant.

Tools

Tool	API Key Required	Description
column_value_format	No	Exact read/write JSON format for any column type
explain_error	No	Decode API errors and get a fix suggestion
scaffold	No	Boilerplate code for integrations, webhooks, OAuth, and apps
validate_query	Optional	Syntax check, complexity estimate, and lint warnings
get_schema	Yes	Live schema introspection, filterable by keyword
run_query	Yes	Execute a query or mutation against the API

Setup

1. Install and build

git clone <repo-url> monday-graphql-mcp
cd monday-graphql-mcp
npm install
npm run build

2. Add to Claude Code

Add this to your ~/.claude/settings.json under mcpServers:

{
  "mcpServers": {
    "monday-graphql-mcp": {
      "command": "node",
      "args": ["/path/to/monday-graphql-mcp/dist/index.js"],
      "env": {
        "MONDAY_API_KEY": "your_api_key_here"
      }
    }
  }
}

Get your API key: monday.com → Avatar → Administration → API.

Restart Claude Code after updating the config.

3. Use without a key

column_value_format, explain_error, and scaffold work immediately with no API key.

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Usage Examples

Get the exact format for a column type

How do I write a people column value?
→ uses column_value_format({ column_type: "people" })

{
  "personsAndTeams": [{ "id": 12345678, "kind": "person" }]
}

Decode an API error

I'm getting "ColumnValueException: invalid value" — what's wrong?
→ uses explain_error({ error: "...", query: "..." })

Validate a query before running it

query {
  boards(ids: [123]) {
    items_page(limit: 500) {
      items {
        id
        name
        column_values { id text value }
        subitems { id name }
      }
    }
  }
}

→ validate_query flags:
  - Estimated complexity: ~4200 (HIGH — likely to hit limits)
  - limit: 500 is the hard cap, but combined with subitems + all column_values this is expensive
  - Fetching all column_values without ids filter — add ids: ["col1"] to reduce complexity
  - Fetching subitems + column_values together — consider two separate queries

Generate boilerplate

Scaffold a TypeScript webhook listener for monday.com
→ uses scaffold({ type: "webhook-listener", language: "typescript" })

Scaffold types: api-client, webhook-listener, oauth-flow, integration, board-view, dashboard-widget
Languages: typescript, javascript, python

Fetch the live schema

Show me the monday.com schema for item-related types
→ uses get_schema({ filter: "item" })

Run a query

query {
  me {
    id
    name
    email
  }
}

→ uses run_query({ query: "..." })

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Supported Column Types

text · long_text · numbers · status · people · date · timeline · checkbox · dropdown · link · email · phone · rating · country · board_relation · dependency · tags · hour · week · world_clock · color_picker · location · formula · mirror · auto_number · creation_log · last_updated · item_id · vote · files · subtasks

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Development

npm run dev      # run with tsx (no build step)
npm run build    # compile TypeScript to dist/
npm start        # run compiled output

The server communicates over stdin/stdout using the MCP protocol — it's designed to be launched by an MCP host (Claude Code, Claude Desktop, etc.), not run directly in a terminal.