# Command Registry -- Technical Specification

**Version**: v1.0.0 | **Status**: Active | **Last Updated**: March 2026

## Overview

Placeholder submodule for terminal command definitions and registration. Intended to provide a structured command registry that maps named commands to handler functions for the interactive shell.

## Architecture

This submodule is currently a namespace placeholder. The `__init__.py` exports an empty `__all__` list. Command handling is currently managed by the parent `terminal_interface` module and the `shells/interactive_shell.py` implementation.

## Current State

- `__init__.py`: Module docstring ("Command definitions") and empty `__all__` -- no command classes implemented yet.
- Future scope: command definition dataclass, argument parsing, and help-text generation.

## Planned Interface

When implemented, the module would expose:

| Class / Function | Purpose |
|-----------------|---------|
| `Command` | Dataclass wrapping a name, handler callable, args spec, and help text |
| `CommandRegistry` | Named lookup of registered commands with argument validation |
| `register_command(name, handler)` | Decorator-based command registration |

## Dependencies

- **Internal**: `terminal_interface.shells` (consumers), `terminal_interface.completions` (tab-complete integration)
- **External**: none

## Constraints

- Not yet implemented; importing yields an empty namespace.
- Zero-mock: `NotImplementedError` for unimplemented paths.

## Navigation

- [README.md](README.md) | [AGENTS.md](AGENTS.md)
- Parent: [terminal_interface](../README.md)
