Announcing Toad - a universal UI for agentic coding in the terminal
I’m a little salty that neither Anthropic nor Google reached out to me before they released their terminal-based AI coding agents.
Developer Tooling
Summary
Anthropic fixed Claude Code's signature terminal flicker in v2.0.72 by rewriting their React-based renderer for fine-grained incremental updates, choosing differential rendering over alt-screen mode to preserve native terminal features like text selection and scrolling.
Highlights
- Anthropic rewrote Claude Code's renderer from scratch, keeping React as the component model but replacing Ink with a custom implementation for incremental updates
- The flicker stems from terminals not being designed for interactivity; ANSI escape codes easily cause flicker if not handled carefully
- Alt-screen mode breaks native terminal features like text selection, scrolling, and search, which Anthropic considers a high bar to compromise
- Most new coding agents have converged on alt-screen TUIs after fighting flicker, but the results haven't been great
- Ink, the original React-based terminal renderer, didn't support the fine-grained incremental updates needed for long-running interactive UIs
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Context
Audience
Developers working with terminal-based tools, TUI developers, and users of AI coding agents
DomainTerminal User Interfaces
Formatblog post
Accessfree online
Source Overview
Anthropic fixed the signature flickering issue in Claude Code with update 2.0.72 by rewriting the React-based terminal renderer for fine-grained incremental updates, avoiding full buffer redraws.
The problem stemmed from terminals' limitations with ANSI escape codes and interactivity, affecting tools like Ink, Cursor, and others. Alternatives like alt-screen mode break native terminal features such as text selection and scrolling, while differential rendering in Claude Code and pi preserves them.
Topics
Related
Ink (React terminal renderer)pi-coding-agent by Mario ZechnerTauTUI (Swift port of pi-tui)ANSI escape codesAlt-screen modeAmp coding agent
