Rtk

RTK, short for Rust Token Killer, is an open source command line proxy that trims the output of terminal commands before it reaches an AI coding agent's context window. Build logs, test runs, git output and file listings are full of progress noise and repeated lines, and RTK groups repeated output into counts, removes boilerplate, and keeps failures, warnings and anything relevant to reasoning. Usage is meant to be install and forget. RTK hooks into the agent so that commands are rewritten, for example running cargo build through RTK returns a short summary instead of more than a thousand lines. The vendor states that it supports more than 125 commands and 17 AI coding tools, adds under 20 milliseconds of overhead, and reduces output by about 56 percent on average for rewritten commands and up to 90 percent on the noisiest. Telemetry is opt in and collects no personal data. The tool is written in Rust, released under the Apache 2.0 license, and the site provides docs, benchmarks, a changelog and translations in several languages. It is aimed at developers who use agents such as Claude Code and want lower token costs, more room in the context window and fewer compactions in long sessions. A separate offering called RTK Pro is described as an AI control layer for teams. The core tool is free to install and the site publishes no paid plan prices, including for RTK Pro.