Pi Coding AgentOpen-Source Agentic Coding CLI

A minimal, extensible terminal coding harness by Mario Zechner. MIT licensed. 15.7k GitHub stars.

⚡

Minimal Core, Maximum Extensibility

Pi avoids dictating workflows. Instead, it provides a foundation that adapts through TypeScript extensions, skills, prompt templates, and themes.

🔗

20+ LLM Providers

Anthropic, OpenAI, Google Gemini, Mistral, Groq, xAI, OpenRouter, Amazon Bedrock, Azure, and more — all via API keys or OAuth subscriptions.

🌳

Session Branching

Full tree-structured session history stored as JSONL. Branch, fork, switch, compact, and replay — all history preserved in a single file.

📦

Package Ecosystem

Share and install extensions, skills, prompts, and themes via npm or git. Project-local or global installation.

🛡️

Damage Control

Real-time safety auditing via extensions — block dangerous bash patterns, enforce path-based access control, and configure confirmation prompts.

🤖

Multi-Agent Patterns

Agent teams, sequential chains, subagents, and meta-agents. Build sophisticated orchestration through extensions and YAML config.

What is Pi?

Pi is an open-source AI coding agent CLI (MIT licensed) created by Mario Zechner. Rather than being a monolithic tool, Pi is designed as a minimal terminal coding harness that adapts through extensibility.

The project is structured as a monorepo with focused packages:

Quick Start

bash

# Install globally
npm install -g @mariozechner/pi-coding-agent

# Set your API key
export ANTHROPIC_API_KEY=sk-ant-...

# Launch
pi

That is it. Pi drops you into an interactive coding session. Type your request, and the agent works with full file system and bash access.

Why Pi?

What Pi Does	What Pi Does NOT Do
Provides multi-provider LLM access	Dictate a single workflow
TypeScript extension API	Lock you into MCP protocol
Session branching and history	Force permission popups
Skills, prompts, themes	Include bloated built-in features
npm/git package ecosystem	Require a specific editor or IDE

Pi's philosophy: the core stays minimal; any workflow is possible through extensibility.