tweakcc

Tweakcc is a TypeScript CLI tool distributed via npm that modifies Claude Code's bundled JavaScript files directly, allowing developers to customize the application well beyond its built-in settings. Core features include editing any of Claude Code's system prompts, creating named toolsets accessible via a new `/toolset` command, building custom UI themes with an HSL/RGB color picker, adding custom thinking verbs and spinner animations, and highlighting input patterns with per-character styling similar to the former `ultrathink` rainbow effect. Version 4.0.0 added AGENTS.md support, a `/remember` skill, MCP startup optimization, token count rounding, statusline throttling, and the ability to unlock unreleased features such as session memory. A standout addition is the `opusplan[1m]` model alias, which routes planning to Claude Opus while using Sonnet's one-million-token context window for execution. The tool targets Claude Code users on all platforms who want fine-grained control over prompts, models per subagent role, table rendering formats, and terminal UI presentation that the official client does not expose.

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