katalyst 0.4.0

A terminal coding agent for Python.

Katalyst Agent

A modular, node-based terminal coding agent for Python, designed for robust, extensible, and production-ready workflows.

Figure: Architecture diagram of the Katalyst Coding Agent (DAG/graph structure)

Quick Setup

To install Katalyst from PyPI, simply run:

pip install katalyst

Important: You must set your OpenAI API key as the environment variable OPENAI_API_KEY or add it to a .env file in your project directory. The first time you run katalyst, you will be prompted to enter your API key if it is missing. You can get an API key from https://platform.openai.com/account/api-keys.

Searching Files (ripgrep required)

The search_files tool requires ripgrep (rg) to be installed on your system:

• macOS: brew install ripgrep
• Ubuntu: sudo apt-get install ripgrep
• Windows: choco install ripgrep

Features

• Automatic project state persistence: Katalyst saves your project state (such as chat history) to .katalyst_state.json in your project directory after every command.

• Modular Node-Based Architecture: Built on a robust DAG (Directed Acyclic Graph) structure that enables flexible and extensible workflows. The system uses a two-level agent structure with an outer planning loop and inner ReAct (Reason-Act) cycles.

• Intelligent Task Planning: Automatically breaks down complex tasks into manageable sub-tasks and executes them sequentially with built-in error recovery and replanning capabilities.

• Rich Tool Integration: Comprehensive set of built-in tools for:

  • File operations (reading, writing, searching)
  • Code analysis and syntax checking
  • Terminal command execution
  • And more, with easy extensibility for custom tools

• Robust Error Handling: Sophisticated error recovery system that can:

  • Classify and format errors for better LLM understanding
  • Automatically trigger replanning when needed
  • Maintain detailed error traces for debugging

• Multi-Language Support: Built-in support for multiple programming languages including:

  • Python
  • JavaScript/TypeScript
  • JSX/TSX
  • (More languages will be added soon...)

• Interactive CLI: User-friendly command-line interface with:

  • Helpful welcome screens and onboarding
  • Real-time feedback and progress updates
  • Detailed logging for debugging

• Configurable LLM Integration: Flexible LLM provider support with:

  • Default OpenAI integration
  • Configurable model selection
  • Easy extension for other LLM providers

Testing

Katalyst includes both unit and functional tests. For detailed information about running tests, writing new tests, and test coverage, see TESTS.md.

TODO

See TODO.md for the latest development tasks and roadmap.