eBay Metadata API Tool Server for AI Agents - n8n Workflow

Developers building AI Agents that require up-to-date eBay policy information.
E-commerce specialists needing programmatic access to eBay metadata and compliance data.

• Users looking for advanced examples of the n8n Multi-Chain Platform (MCP) architecture and custom n8n templates.

This n8n workflow provides a robust solution for integrating the eBay Metadata API directly into a conversational AI Agent framework. The primary goal is to empower an AI to answer complex, policy-specific questions about eBay listings accurately. Instead of relying solely on general knowledge or complex prompt engineering, this n8n workflow exposes specific eBay endpoints—like sales tax jurisdictions, return policy guidelines, and hazardous materials labels—as distinct, callable tools via dedicated n8n node setup.

By leveraging this Multi-Chain Platform (MCP) architecture, you maximize the utility and precision of your n8n agent, allowing it to accurately retrieve and synthesize specific eBay policies on demand, making this a powerful n8n workflow for complex e-commerce automation and compliance checks.

This architecture begins with the specialized Metadata MCP Server n8n trigger. Unlike standard scheduling or HTTP webhook n8n triggers, this component is designed to listen for structured requests originating from an upstream AI Agent built using the n8n AI capabilities.

When the AI Agent determines that an external API call is necessary to satisfy the user's query (e.g., "What are the current return policies for this category?"), the Metadata MCP Server n8n trigger activates. The core of this n8n workflow consists of multiple independent HTTP Request Tools, each functioning as a specialized n8n node corresponding to a specific eBay Metadata API endpoint.

Key to this n8n template is the connection: the AI Agent intelligently selects the appropriate tool (n8n node) to execute, fetching data for functions such as 'Get Automotive Parts Policies' or 'Get Sales Tax Jurisdictions.' The resulting data retrieved by the successful n8n node is then returned seamlessly to the AI Agent for final processing and generation of a cohesive response. This efficient n8n workflow design ensures precise and context-aware API utilization.

1. Import the provided n8n workflow JSON into your self-hosted or cloud n8n instance.


2. Activate the n8n workflow. The Metadata MCP Server n8n trigger automatically serves as an internal endpoint for AI tool calls.


3. Configure all HTTP Request Tool n8n node instances. You must set up the necessary credentials (e.g., eBay API keys, OAuth tokens) required for successful authorization against the eBay Metadata API. Ensure the API base URL and method (likely GET) are correctly configured within the parameters of each respective n8n node.


4. Connect this service to your primary AI Agent workflow, referencing the Metadata MCP Server n8n trigger as a registered tool within your main AI Agent configuration. This allows the AI agent to utilize this entire n8n workflow as a single, powerful toolset.

Metadata MCP Server (n8n trigger): This unique n8n trigger acts as the entry point for the AI Agent. It listens for specific tool-use requests and routes them to the corresponding API n8n node configured within this n8n workflow. It is essential for defining the entire n8n template as an AI tool server.
HTTP Request Tools (Multiple n8n nodes): These nodes are the functional core of the n8n workflow, responsible for precise interaction with the various eBay Metadata API endpoints. Each n8n node executes a specific, defined API call. Examples include:
Get Sales Tax Jurisdictions: Retrieves current tax policy data.
Get Automotive Parts Policies: Fetches policies specific to auto components.
Get Return Policy Guidelines: Obtains standard eBay return rules.
Get Hazardous Materials Labels: Fetches regulatory labeling requirements.
* Each n8n node must be individually configured with the correct endpoint path and necessary authentication headers for successful API interaction.