# Agent Instructions: PhotoTools3

## Environment Setup

Requires a `.env` file with the following variables:

- `llm_api_key`: API key for the LLM provider.
- `llm_api_base_url`: Base URL for the LLM API.
- `llm_default_temperature`: Float value for temperature.

## System Dependencies

- `exiftool` binary: required by `pyexiftool` at runtime, not installable via pip/uv.
  - Arch: `perl-image-exiftool`
  - Debian/Ubuntu: `libimage-exiftool-perl`

## Development Toolchain

- **Dependency Management**: Use `uv`.
- **Python Version**: Requires Python `>=3.14`.
- **Testing**: Run `pytest` to execute the test suite in `test/`.
- **Linting & Formatting**: Use `ruff` and `black`.

## CLI Usage

The primary entry point is the `photools3` command:

- `photools3 keywords <image_path>`: Extracts keywords and captions from a single image.

## Architecture & Logic

- **`src/photools3/photo.py`**: Core image processing logic, including resizing, RGB conversion, and generating base64 JPEG encodings specifically for LLM vision compatibility.
- **`src/photools3/llm_session.py`**: Manages the workflow of sending processed images to the LLM and parsing results.
- **Configuration**: The list of keywords to extract is maintained in `config/keywords.txt`.

## Code style

- Avoid overly verbose docstrings or comments. Be precise!

## Comunication

- When done with code modifications, give a one-liner for the currently unstaged changes that can be used as a commit message.