Tau

Tau is an educational Python coding-agent project designed for learning how coding agents are built.

Tau is a small Python coding agent that acts as a curriculum for learning how coding agents are built. Users watch it stream model output, call tools, manage sessions, and grow into a terminal user interface one layer at a time. The project separates the brain, the environment, and the face into distinct parts, ensuring the core loop does not depend on the terminal, file paths, or rendering. It includes provider adapters, a reusable agent loop, files, shell, durable sessions, skills, slash commands, and a Textual terminal user interface. The project is inspired by Pi and written as a Python learning path for developers who want to understand agent architecture.

Tau at a glance

Best for: Software engineer
Pricing: Free
Released: June 2026
Category: AI coding tool
Website: twotimespi.dev

Key features

Stream model output
Call tools
Manage sessions
Provide provider adapters
Support file and shell operations
Include durable sessions
Run a Textual terminal user interface

Use it for

Learn how coding agents are built
Study provider layers and agent loops
Run a real terminal agent

Companions

Tools that articles about Tau recommend using with it, each with its job.

Ollama — Run local models at zero marginal cost, with code kept on your machine.
Context7 — Provides up-to-date documentation for AI agents and code editors.
OpenRouter — Access over 500 models and 80 providers through one unified API.
Daytona — Runs sessions in isolated sandboxes synced to git branches.
Composio — Equips AI agents with tools, managed user auth, and sandboxes across 1,500+ apps
Oh My OpenCode Slim — Lightweight multi-agent orchestration and background tasks.

Alternatives to Tau

OpenCode — Works with 75+ model providers, local models, and existing subscriptions
jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
Command Code — Repairs open model tool calls and learns developer patterns automatically.
pstack — Improves AI coding agent outcomes with rigorous workflows.
LangChain — Compose exactly the agent your use case needs from model, tools, prompt, and middleware.
Google ADK — It applies software development principles to agent creation with Python.
Magpie — It enables AI agents to use models not natively supported by their internal protocols.
Pandacode — Run multiple coding agents, tasks, Git, and a terminal in one workspace.
ZCode — Integrates GLM-5.3 with multi-agent workflows and remote chat control.
Archon — Orchestrate multiple AI agents with isolated workflows via a single command layer.
Codex Host — Runs different AI coding assistants simultaneously in the native Codex Desktop window.
Atomic Agents — Build predictable, modular AI applications with consistent, reliable outputs.

All Tau alternatives