# MCP Chat

MCP Chat is a command-line interface application that enables interactive chat capabilities with AI models through the Anthropic API. The application supports document retrieval, command-based prompts, and extensible tool integrations via the MCP (Model Context Protocol) architecture.

See [ARCHITECTURE.md](ARCHITECTURE.md) for diagrams of how `main.py`, `mcp_client.py`, `mcp_server.py`, and the `core/` modules fit together.

## Prerequisites

- Python 3.10+
- Anthropic API Key

## Setup

### Step 1: Configure the environment variables

1. Copy `.env.example` to `.env` in the project root and fill in the values:

```bash
cp .env.example .env
```

```
ANTHROPIC_API_KEY=""              # Your Anthropic API secret key
CLAUDE_MODEL="claude-sonnet-4-5"  # Model id to chat with
USE_UV=1                          # 1 to launch the MCP server via uv, 0 for plain python
```

`ANTHROPIC_API_KEY` and `CLAUDE_MODEL` are both required — the app exits at startup if either is empty.

### Step 2: Install dependencies

#### Option 1: Setup with uv (Recommended)

[uv](https://github.com/astral-sh/uv) is a fast Python package installer and resolver.

1. Install uv, if not already installed:

```bash
pip install uv
```

2. Create and activate a virtual environment:

```bash
uv venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate
```

3. Install dependencies:

```bash
uv pip install -e .
```

4. Run the project

```bash
uv run main.py
```

#### Option 2: Setup without uv

1. Create and activate a virtual environment:

```bash
python -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate
```

2. Install dependencies:

```bash
pip install anthropic python-dotenv prompt-toolkit "mcp[cli]==1.8.0"
```

3. Run the project

```bash
python main.py
```

## Usage

### Basic Interaction

Simply type your message and press Enter to chat with the model.

### Document Retrieval

Use the @ symbol followed by a document ID to include document content in your query:

```
> Tell me about @deposition.md
```

### Commands

Use the / prefix to execute prompts defined in the MCP server. Each command takes a document id:

```
> /format deposition.md
```

Commands will auto-complete when you press Tab. `mcp_server.py` currently defines one prompt, `format`.

## Development

### Adding New Documents

Edit the `mcp_server.py` file to add new documents to the `docs` dictionary.

### Adding New MCP Servers

Pass additional server scripts as arguments; each is launched as its own MCP client and its tools are merged into the tool set offered to the model:

```bash
uv run main.py path/to/other_server.py
```

### Linting and Typing Check

There are no lint or type checks wired into CI. To lint locally:

```bash
uvx ruff check .
```