# Human‑in‑the‑Loop Agent

This repository implements a simple command‑line agent that pauses before each tool call and asks the user to approve or reject the action. It uses **LangChain** and **LangGraph**'s `HumanInTheLoopMiddleware`.

## Prerequisites

- Python 3.11+ (tested with 3.11 and 3.12)
- An OpenAI API key or a local LLM compatible with the OpenAI API (e.g., Ollama)

## Setup

```bash
# Create a virtual environment
python -m venv .venv
source .venv/bin/activate

# Install dependencies
pip install -r requirements.txt
```

## Configuration

*OpenAI API key*

```bash
export OPENAI_API_KEY="YOUR_KEY"
```

*Local model (e.g., Ollama)*

If you run a local model, edit **agent.py** and uncomment/adjust the `base_url` and `api_key` arguments in the `ChatOpenAI` constructor:

```python
ChatOpenAI(
    base_url="http://localhost:11434/v1",
    api_key="ollama",
    model="llama3",
)
```

## Usage

```bash
python agent.py
```

You will be prompted to enter a question. The agent will invoke the `get_weather` tool and pause for confirmation.

```
Enter your question: What is the weather in Kazan today?

Action 1: get_weather
Arguments: {'city': 'Kazan', 'date': 'today'}
Decision (a=approve, r=reject): a

Agent response:
Weather in Kazan on today
```

*If you reject an action, you will be asked for a reason, which is sent back to the agent as feedback.*

## License
MIT