Make JustCall Work with Your Claude via MCP (or Zapier MCP)

Overview

This guide enables you to set up a Zapier MCP server, connect it to JustCall, and integrate with Claude Desktop. Once configured, you can control JustCall using natural language commands within Claude.

Prerequisites

Before starting, ensure you have:

• A Zapier account with AI Actions access
• JustCall API Key and Secret from your dashboard
• Claude Desktop installed on your machine

Step-by-Step Setup

Step 1: Access Zapier AI Actions Settings

1. Navigate to Zapier AI Actions Settings
2. Go to Settings > MCP in the left navigation
3. Locate the MCP Server URL section

Step 2: Generate Your MCP Server URL

1. Click Generate URL
2. A secure, unique MCP server endpoint will be created for connecting Zapier with Claude

Step 3: Edit MCP Actions

1. Click Edit MCP Actions
2. This is where you'll define specific tasks your Claude assistant can perform via Zapier

Step 4: Add a New Action

1. Click Add a new action
2. You'll be prompted to set up a task Claude can trigger (e.g., find contact, send SMS)

Step 5: Connect Your JustCall Account

1. Search for JustCall in the Zapier app search bar
2. Select your desired action (Find Contact, Create Contact, Send SMS)
3. Click Connect a new JustCall account
4. You'll be prompted for your JustCall API Key and Secret

Step 6: Retrieve JustCall API Credentials

1. Log into your JustCall dashboard
2. Navigate to Settings > Developers
3. Copy your API Key and API Secret
4. Return to Zapier and paste the credentials

Step 7: Enable the Action

1. Review your setup for accuracy
2. Click Enable Action to activate the integration

Step 8: Copy Configuration for Claude Desktop

1. Return to Zapier AI Actions Settings
2. Click Claude Desktop under Quick Start
3. Copy the generated JSON snippet

Example format:

{
  "mcpServers": {
    "zapier-mcp": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://actions.zapier.com/mcp/your-unique-id/sse"
      ]
    }
  }
}

Note: Replace your-unique-id with your actual Zapier MCP server ID.

Step 9: Update Claude Desktop Configuration

1. Open Claude Desktop
2. Press Cmd + , (macOS) or Ctrl + , (Windows) for Settings
3. Go to the Developer tab
4. Click Edit Config
5. Open the claude_desktop_config.json file
6. Paste the JSON snippet
7. Save and restart Claude Desktop

Step 10: Confirm MCP Connection in Claude

After restarting:

• You should see "MCP tools are available"
• View your enabled actions (e.g., justcall_find_contact, justcall_create_contact)
• This confirms successful integration

Using Claude to Control JustCall

You can now issue natural language commands like:

• "Create a new contact in JustCall with name Jane Doe and phone number 9876543210"
• "Find a contact in JustCall by phone number 1234567890"
• "Send a text message via JustCall saying 'Thanks for reaching out!'"

Claude will parse these commands and execute the appropriate JustCall action via Zapier's MCP.

Troubleshooting Tips

• MCP Server not recognized? Verify the URL in your JSON snippet
• Action not running in Claude? Confirm the action is enabled in Zapier and your credentials are valid
• Claude not responding? Restart Claude Desktop and verify the MCP connection in the Developer tab