Rust Token Killer – High-performance CLI proxy to minimize LLM token consumption

A new command-line tool called RTK is promising to slash AI costs by up to 90% through a surprisingly simple approach: filtering out the digital noise before it reaches your language model. The Rust-based "token killer" intercepts common programming commands like git status, directory listings, and test outputs, then strips away comments, whitespace, and redundant information that typically bloats AI context windows.

During a typical 30-minute coding session with Claude, RTK can reduce token consumption from 150,000 to just 45,000 tokens, translating to significant cost savings for developers who rely heavily on AI assistants. The tool works by automatically rewriting commands through Claude's hook system, so when you type "git status," it becomes "rtk git status" behind the scenes, delivering compressed, relevant output instead of verbose logs.

What makes RTK particularly clever is its "tee" feature, which saves full command outputs to files when errors occur, preventing AI agents from repeatedly running the same failed commands. The developers have implemented comprehensive security reviews for the project, recognizing that any tool intercepting shell commands requires careful scrutiny. For developers spending hundreds monthly on AI tokens, RTK offers a practical solution to keep costs manageable while maintaining full functionality.