Most Python CLI tools start simple… and then slowly turn into chaos.
You begin with a couple of commands, maybe argparse, maybe click. Then you add prompts. Then state. Then formatted output. Then some sort of flow. And suddenly your “small CLI tool” looks like a badly stitched Frankenstein of utilities.
I got tired of that.
So I built Klix — a Python framework for building structured, interactive, and polished command-line applications.
The Problem
Building a real CLI app (not just a script) usually means juggling:
- Command parsing
- User input flows
- State management
- Formatted output
- Navigation / interaction
- Consistency across commands
Most tools solve one of these well. Very few help you build the whole experience cleanly.
So you either:
- Glue multiple libraries together
- Or reinvent half of it yourself
Neither option ages well.
What Klix Is
Klix is a command-first CLI framework that brings everything into one place:
-
Command routing (
/commands) - Typed session state
- Prompt-driven input
- Rich terminal rendering
- Middleware & lifecycle events
- Lightweight layout system
- Built-in UI helpers (forms, tables, panels, etc.)
Instead of stitching tools together, you build your app on a single structured runtime.
A Minimal Example
from dataclasses import dataclass
import klix
@dataclass
class State(klix.SessionState):
count: int = 0
app = klix.App(
name="demo",
version="0.1.0",
description="Simple Klix app",
state_schema=State,
)
@app.command("/hello")
def hello(session: klix.Session):
session.state.count += 1
session.ui.print(f"Hello! Run #{session.state.count}")
app.run()
That’s it. You get:
- Structured commands
- Persistent session state
- Clean output
- An interactive loop Without duct-taping libraries together.
What Makes It Different
Instead of being “just a CLI parser”, Klix treats your app like a system:
- Command-first design Everything revolves around commands like: /login /deploy /help
- Typed session state No more random globals or passing variables everywhere.
- Built-in interaction model Prompts, confirmations, selections — already handled.
- Rich output with fallback Pretty when possible, safe when not.
- Middleware & events Hook into lifecycle and behavior cleanly.
- Layout primitives Structure your CLI instead of dumping text endlessly. ---
What You Can Build
Klix is useful for things like:
- Developer tools
- Internal admin CLIs
- Interactive setup tools
- Terminal assistants
- Workflow-driven apps
- Data exploration tools Basically, anything where a CLI needs to feel like an experience, not a script.
Getting Started
Install Klix:
pip install klix
Create a new project:
klix init my-app
cd my-app
python main.py
You’ll get a working interactive CLI that you can start extending immediately.
Contributing
Klix is open source, and contributions are welcome.
You can help by:
- Reporting bugs
- Suggesting features
- Improving docs
- Adding examples
- Contributing code If you’re contributing code:
- Fork the repo
- Create a feature branch
- Make your changes
- Submit a pull request Try to keep changes focused and readable. This is a developer tool, not a puzzle.
Current Direction
Klix is still evolving, but the goal is clear:
"Make building interactive CLI apps in Python simple, structured, and enjoyable."
Future improvements will focus on:
- Better developer ergonomics
- Richer UI components
- Improved layout system
- Plugin/extensibility model
Final Thoughts
I didn’t build Klix to replace everything.
I built it because building CLI apps felt unnecessarily messy. If you’ve ever tried to structure a non-trivial CLI and ended up fighting your own codebase, Klix might save you some time.
🔗 GitHub: https://github.com/Arjun-M/Klix
If nothing else, at least now your CLI doesn’t have to look like it evolved by accident.
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