An educational Python project for learning how coding agents are built.https://twotimespi.dev/https://twotimespi.dev/concepts/https://twotimespi.dev/concepts/The handful of ideas behind Tau — agents, providers, tools, sessions, skills, context, and thinking.https://twotimespi.dev/contributing/https://twotimespi.dev/contributing/How Tau is developed, where the build journals live, and how to run the project locally.https://twotimespi.dev/guides/context/https://twotimespi.dev/guides/context/Keep long sessions working with automatic and manual compaction, and control model effort with thinking modes.https://twotimespi.dev/guides/extensions/https://twotimespi.dev/guides/extensions/Extend Tau with plain Python — custom tools, slash commands, hooks, dialogs, and message rendering.https://twotimespi.dev/guides/local-inference/https://twotimespi.dev/guides/local-inference/Configure Tau's built-in llama.cpp backend through /local.https://twotimespi.dev/guides/print-mode/https://twotimespi.dev/guides/print-mode/Run Tau non-interactively for a single prompt — ideal for scripts, pipes, and CI.https://twotimespi.dev/guides/project-instructions/https://twotimespi.dev/guides/project-instructions/Give Tau standing instructions about your project with AGENTS.md files.https://twotimespi.dev/guides/project-trust/https://twotimespi.dev/guides/project-trust/Control ambient repository inputs before Tau loads them.https://twotimespi.dev/guides/providers-and-models/https://twotimespi.dev/guides/providers-and-models/Connect OAuth subscriptions, API-key providers, or a local model — and switch models any time.https://twotimespi.dev/guides/sessions/https://twotimespi.dev/guides/sessions/Resume past conversations, branch from any point in history, rename sessions, and export them.https://twotimespi.dev/guides/skills-and-prompts/https://twotimespi.dev/guides/skills-and-prompts/Teach Tau reusable know-how with skills, and stop retyping instructions with prompt templates.https://twotimespi.dev/guides/themes/https://twotimespi.dev/guides/themes/Restyle the Tau TUI with JSON theme files, from single colors to full custom palettes.https://twotimespi.dev/guides/tui/https://twotimespi.dev/guides/tui/Get fluent in Tau's terminal UI — prompting, steering, the command palette, tool output, and pickers.https://twotimespi.dev/internals/agent-loop/https://twotimespi.dev/internals/agent-loop/The small engine at Tau's center, and the event stream every frontend renders.https://twotimespi.dev/internals/architecture/https://twotimespi.dev/internals/architecture/How Tau is split into three layers — and why that boundary is the whole point.https://twotimespi.dev/internals/custom-frontend/https://twotimespi.dev/internals/custom-frontend/Advanced — drive Tau's coding session from your own UI by consuming its event stream.https://twotimespi.dev/internals/design-principles/https://twotimespi.dev/internals/design-principles/The handful of rules that keep Tau small, portable, and readable.https://twotimespi.dev/quickstart/https://twotimespi.dev/quickstart/Install Tau, connect a model, and run your first coding session.https://twotimespi.dev/reference/cli/https://twotimespi.dev/reference/cli/Every Tau command-line command and flag.https://twotimespi.dev/reference/configuration/https://twotimespi.dev/reference/configuration/Where Tau stores state, and the shape of its config files.https://twotimespi.dev/reference/keybindings/https://twotimespi.dev/reference/keybindings/Default keys for the Tau TUI, and how to remap them.https://twotimespi.dev/reference/rpc/https://twotimespi.dev/reference/rpc/Control Tau as a subprocess with Pi-compatible JSONL commands and events.https://twotimespi.dev/reference/slash-commands/https://twotimespi.dev/reference/slash-commands/Every in-session slash command in the Tau TUI.https://twotimespi.dev/reference/tools/https://twotimespi.dev/reference/tools/The read, write, edit, and bash tools the agent uses to work in your project.https://twotimespi.dev/releases/https://twotimespi.dev/releases/New features, fixes, and changes in each Tau release.https://twotimespi.dev/roadmap/https://twotimespi.dev/roadmap/What's shipped, what's in progress, and what's next for Tau.https://twotimespi.dev/what-is-tau/https://twotimespi.dev/what-is-tau/Tau is a small, readable coding agent for your terminal — and a working example of how coding agents are built.https://twotimespi.dev/why-tau/https://twotimespi.dev/why-tau/A friendly, ranty, non-mathy case for the circle constant τ — and why the famous equations look even better with it.