RTK is a high-performance command-line proxy designed to reduce the amount of shell output consumed by AI coding agents. It intercepts command results and filters or compresses noisy output before it enters the model's context window, helping agents spend fewer tokens on logs, listings, build output, and other repetitive terminal data.

Implemented as a single Rust binary, RTK supports many common command-line tools and is intended to work transparently inside agent-driven development workflows. It is useful for developers who rely heavily on terminal-based coding agents and want to preserve more context for reasoning and source code while lowering token usage caused by verbose command output.