LINE assistant with Google Calendar and Gmail integration

# AI Assistant with Dynamic Tool Selection

This n8n workflow provides a flexible AI assistant that can respond to user queries by leveraging an OpenAI Chat Model and optionally using a Wikipedia tool for information retrieval. It's designed to be triggered via a webhook, making it easy to integrate with various front-end applications or chat platforms.

## What it does

1.  **Receives User Input**: The workflow starts by listening for incoming HTTP POST requests via a **Webhook** node. This webhook expects a JSON payload containing the user's query.
2.  **Processes Input**: An **Edit Fields (Set)** node then extracts the user's query from the webhook payload and prepares it for the AI agent.
3.  **Routes Query for Tool Use**: A **Switch** node intelligently determines if the AI agent should use a specific tool based on the user's query.
    *   **Case 1: Tool Use (Wikipedia)**: If the query suggests the need for external knowledge (e.g., asking for factual information), the workflow routes to an **AI Agent** configured with a **Wikipedia** tool. This allows the AI to search Wikipedia for answers.
    *   **Case 2: Direct AI Response**: If no specific tool is required, the query is directly passed to the **AI Agent** for a general response.
4.  **Generates AI Response**: An **AI Agent** node, powered by an **OpenAI Chat Model** and a **Simple Memory** buffer, processes the user's query.
    *   It uses the **OpenAI Chat Model** for natural language understanding and generation.
    *   The **Simple Memory** node helps maintain context within a conversation, allowing the AI to remember previous interactions.
    *   If routed through the "Tool Use" path, the agent will utilize the **Wikipedia** tool to gather information before formulating its response.
5.  **Returns Response**: Finally, an **HTTP Request** node is used to send the AI's generated response back to the originating system or application.

## Prerequisites/Requirements

*   **n8n Instance**: A running n8n instance (cloud or self-hosted).
*   **OpenAI Account**: An OpenAI API key configured as an n8n credential for the "OpenAI Chat Model" and "OpenAI" nodes.
*   **Wikipedia**: No specific account is needed for the Wikipedia tool, as it accesses public information.

## Setup/Usage

1.  **Import the workflow**: Download the provided JSON and import it into your n8n instance.
2.  **Configure Credentials**:
    *   Locate the "OpenAI Chat Model" and "OpenAI" nodes.
    *   Click on the "Credentials" field and select or create an "OpenAI API" credential. Enter your OpenAI API Key.
3.  **Activate the Webhook**:
    *   Locate the "Webhook" node.
    *   Copy the "Webhook URL" that n8n generates. This URL will be the endpoint for your AI assistant.
4.  **Configure the Switch Node**:
    *   The "Switch" node is pre-configured to check for keywords that might indicate the need for the Wikipedia tool. Review and adjust its conditions as needed to match your desired tool-triggering logic.
5.  **Test the workflow**:
    *   Activate the workflow.
    *   Send an HTTP POST request to the copied Webhook URL with a JSON body containing your query, for example:
        ```json
        {
          "query": "What is the capital of France?"
        }
        ```
        or
        ```json
        {
          "query": "Tell me a joke."
        }
        ```
    *   Observe the execution in n8n and the response returned by the webhook.
6.  **Integrate**: Use the Webhook URL in your application, chat bot, or other systems to interact with the AI assistant.