# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

SmartTools is a lightweight personal tool builder for AI-powered CLI commands. It lets users create custom terminal commands that call AI providers, chain prompts with Python code steps, and use them like any Unix pipe command.

## Development Commands

```bash
# Install for development
pip install -e ".[dev]"

# Run tests
pytest

# Run a single test
pytest tests/test.py::test_name

# Run the CLI
python -m smarttools.cli

# Launch the UI
smarttools ui
```

## Architecture

### Core Modules (`src/smarttools/`)

- **cli.py**: Entry point (`smarttools` command). Routes subcommands: list, create, edit, delete, test, run, ui, refresh
- **tool.py**: Tool definition dataclasses (`Tool`, `ToolArgument`, `PromptStep`, `CodeStep`), YAML config loading/saving, wrapper script generation
- **runner.py**: Execution engine. Runs tool steps sequentially, handles variable substitution (`{input}`, `{varname}`), executes Python code steps via `exec()`
- **providers.py**: Provider abstraction. Calls AI CLI tools via subprocess, reads provider configs from `~/.smarttools/providers.yaml`
- **ui.py**: UI dispatcher - selects between urwid and snack implementations
- **ui_urwid.py**: Full TUI implementation using urwid library
- **ui_snack.py**: Fallback TUI using python-newt/snack

### Key Paths

- **Tools storage**: `~/.smarttools/<toolname>/config.yaml`
- **Wrapper scripts**: `~/.local/bin/<toolname>` (auto-generated bash scripts)
- **Provider config**: `~/.smarttools/providers.yaml`

### Tool Structure

Tools are YAML configs with:
- `name`, `description`, `category`
- `arguments`: Custom flags with defaults (e.g., `--max` → `{max}`)
- `steps`: Ordered list of `prompt` or `code` steps
- `output`: Template for final output (e.g., `"{response}"`)

### Step Types

1. **Prompt Step**: Calls AI provider with template, stores result in `output_var`
2. **Code Step**: Executes Python code via `exec()`, captures specified variables

### Variable Flow

Variables are passed between steps:
- `{input}` - always available (stdin/file content)
- `{argname}` - from tool arguments
- `{step_output_var}` - from previous step's `output_var`

Variable substitution is simple string replacement in `runner.py:substitute_variables()`.

## Provider System

Providers are CLI tools that accept prompts via stdin and output to stdout. Defined in `~/.smarttools/providers.yaml`:

```yaml
providers:
  - name: claude
    command: "claude -p"
  - name: mock
    command: "echo '[MOCK]'"
```

The `mock` provider is built-in for testing without API calls.