by y-times-y
A malleable coding agent app. Use Claude Code and Codex to build your projects and reshape y itself live.
# Add to your Claude Code skills
git clone https://github.com/y-times-y/yy is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by y-times-y. A malleable coding agent app. Use Claude Code and Codex to build your projects and reshape y itself live. It has 82 GitHub stars.
y's catalog security scan is still queued. You can run an instant dependency and prompt-injection check now with the "Scan for vulnerabilities" button above.
Clone the repository with "git clone https://github.com/y-times-y/y" and add it to your Claude Code skills directory (see the Installation section above).
y is primarily written in TypeScript. It is open-source under y-times-y on GitHub, so you can review or fork the full source.
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https://github.com/user-attachments/assets/24f10277-bb0e-4c3f-8a05-6833363d07a2
y is a malleable desktop coding-agent app.
It is built around a simple idea: software should become malleable while you use it. The main interface is a chat, but the app can reshape its own UI through a protected Modify surface. You can ask y to change how y itself works, keep the change if it renders safely, or roll it back if it does not.
y is not a new agent model. It is a local, chat-first workspace for the coding agents you already use: Claude Code, OpenAI Codex, and other CLI-native agents over time.
y does not collect your chat data. Project files, terminal commands, chat contents, and agent prompts are not collected or stored by y.
y only uses product analytics for basic app health and usage signals, like sign-in state, feature usage, feedback, and missing-brick requests. "Local" means Claude Code and Codex run on the user's machine through their official CLIs. Login supports account-based product features and basic usage analytics.
git init, then start separate chats in isolated workspaces so agents can work in parallel without touching the same checkout.Modify is the part of y that edits y itself. It is a separate chat focused on changing the app interface, not your project code. The change still goes through code and diff review: Modify edits the local Userland UI, y renders it, and you choose whether to keep or revert it.
Modify is not meant to control the protected app core. It should not get access to auth/session internals, analytics controls, privileged host APIs, or the Modify system itself. Those boundaries live in the protected Kernel.
Most coding-agent apps are fixed products. You can use them, configure them, maybe install plugins, but the product itself still belongs to someone else.
y is different. It treats the app as malleable software:
y is split into two parts:
| Layer | What it does |
|---|---|
| Protected Kernel | Auth, local engine adapters, app state, safety rails, filesystem boundaries, terminal bridge, Modify rail, and rollback runway. |
| Mutable Userland | The chat UI and app surface that can be edited live by the user or by Modify. |
This split lets y feel self-modifying without giving the modification agent control over the protected core. The app can change its own interface, but the Kernel still owns the trust boundaries.
y runs coding agents locally instead of proxying them through a hosted account.
The user's local CLI auth remains the source of truth. y orchestrates the experience; it does not replace the agent providers.
The latest macOS build is published on GitHub Releases:
Current release target: macOS Apple Silicon.
cd app
pnpm install
pnpm dev
Useful checks:
pnpm typecheck
pnpm test:ui
Build a local macOS bundle:
pnpm build:mac
The generated app artifacts are written to app/dist/ and are intentionally not committed.
y is under active development. The current focus is launch-readiness for macOS: packaging, auth, analytics, local app-state durability, and the self-modifying Modify workflow.
MIT. See LICENSE.