Fix PayPal MCP Server

This skill fixes common initialization errors with the PayPal MCP server, such as npx failures, "tools argument missing", or ESM/CommonJS conflicts.

When to Use

Use this skill when:

•The PayPal MCP server fails to start with "EOF" or "initialization failed".
•You see errors about missing --tools arguments.
•You encounter require is not defined errors.
•The default npx @paypal/agent-toolkit command does not work.

How it Works

The default @paypal/agent-toolkit package does not have a bin entry/executable. This skill provides a custom runner script (run-paypal-mcp.cjs) that manually initializes the toolkit and connects it to the MCP SDK.

Setup Instructions

1. Copy the Runner Script

Copy the resource file resources/run-paypal-mcp.cjs to your project root (e.g., scripts/run-paypal-mcp.cjs or just ./run-paypal-mcp.cjs).

2. Configure Environment

Ensure your .env.local or MCP environment config has:

•PAYPAL_ACCESS_TOKEN: A valid access token.
•PAYPAL_ENVIRONMENT: PRODUCTION or SANDBOX.

3. Update MCP Configuration

Edit your mcp_config.json (or .cursor/mcp.json) to use the new script with node instead of npx.

json

"paypal-mcp-server": {
  "command": "node",
  "args": [
    "/absolute/path/to/your/run-paypal-mcp.cjs"
  ],
  "env": {
    "PAYPAL_ACCESS_TOKEN": "...",
    "PAYPAL_ENVIRONMENT": "PRODUCTION"
  }
}

4. Restart

Restart Antigravity or the MCP server functionality.

Dependencies

The script requires:

•@paypal/agent-toolkit
•@modelcontextprotocol/sdk

If you see zod errors, check for v3 export issues in the zod package and patch if necessary (add "./v3": "./lib/index.js" to node_modules/zod/package.json).