RTK — Rust Token Killer

What it does

CLI proxy between your terminal and AI coding agent. Compresses command output (cargo test: 155→3 lines), cleans context for better reasoning. Average savings: 89% across 7,000+ commands. Works with Claude Code, Cursor, Gemini CLI, Aider, Codex, Windsurf, Cline. Single Rust binary. Zero deps. 1,000+ GitHub stars in a month. MIT license.

RTK cuts CLI output noise before it reaches your AI context: 56% less on average for rewritten commands, up to 90% on the noisiest. Zero config, Apache 2.0.

Diagram: a dense grid of tokens fills 86% of the AI context window, close to autocompact. It flows through the RTK filter, which strips the CLI output noise and leaves the meaningful lines: the same window back down to 73% used, with room to think. AI agents don't need more output. They need more relevant output. Chart: a Claude Code context window late in a session: 86% used, close to autocompact. The fixed costs are tiny (system prompt and tools 3%, MCP tools 1%, memory files 1%, skills 0.5%); what fills the window is conversation history at 62% and CLI output and logs at 18%. After RTK filters that output the CLI share drops to 5% and total usage to 73%, back out of compaction territory.…from rtk-ai.app

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