Unknown error executing client feature: when executing WC tools

[agung2001]

it seems that when using Feature API with OpenAPI model, the model can't determine correctly which tools it supposed to be using.
but when I use Cursor with Agent mode and claude-4-sonnet it work perfectly

Steps to Reproduce

Feature API

1. Install and activate :

• WordPress MCP
• WordPress Feature API
• WooCommerce

2. Enable feature api load : define('WP_FEATURE_API_LOAD_DEMO', true); in wp-config.php
3. Set MCP options :

• Enable MCP Functionality
• Enable WordPress Features Adapter
• Enable Create Tools
• Enable Update Tools

4. Do query prompt : search all products that contain word "Hoodie" in its title
5. FAILED: Unknown error executing client feature

Cursor

MCP Configuration

{
  "mcpServers": {
    "acfwp-mcp": {
      "command": "npx",
      "args": ["-y", "@automattic/mcp-wordpress-remote@latest"],
      "env": {
        "WP_API_URL": "http://acfwp.local/",
        "WP_API_USERNAME": "admin",
        "WP_API_PASSWORD": "RANDOM_APPLICATION_PASSWORD"
      }
    }
  }
}

Query using cursor

Environment

• Operating System: Mac OS
• Browser/App Version: Firefox 140.0b6