RTK - Rust Token Killer

RTK (Rust Token Killer) is an open-source CLI proxy that intercepts shell command outputs and compresses them before they reach your LLM context window, delivering 60-90% token savings on common developer commands. Built as a single Rust binary with zero dependencies and less than 10ms overhead, it supports 100+ commands across git, test runners, build tools, package managers, AWS, and containers. RTK integrates with 12 AI coding tools including Claude Code, GitHub Copilot, Cursor, Gemini CLI, Windsurf, and Cline via transparent auto-rewrite hooks that require no changes to your workflow.

• Smart Filtering — removes noise such as comments, whitespace, and boilerplate from command output before it reaches the LLM context.
• Grouping — aggregates similar items (files by directory, errors by type) to reduce repetitive output.
• Truncation — keeps relevant context and cuts redundancy, preserving only what the LLM needs.
• Deduplication — collapses repeated log lines with counts to minimize token waste.
• Auto-Rewrite Hook — transparently rewrites Bash commands (e.g., git status → rtk git status) so AI tools get compressed output with zero manual effort; install with rtk init -g.
• 100+ Supported Commands — covers git, GitHub CLI, Jest, pytest, cargo test, ESLint, TypeScript, Docker, kubectl, AWS CLI, and many more.
• Token Savings Analytics — use rtk gain to view summary stats, ASCII graphs, daily breakdowns, and JSON exports of tokens and estimated USD saved.
• Missed Savings Discovery — rtk discover scans recent sessions to identify commands that bypassed RTK and could have saved more tokens.
• Multi-Agent Support — integrates with Claude Code, Cursor, Gemini CLI, Codex, Windsurf, Cline/Roo Code, OpenCode, Kilo Code, and more via per-agent init commands.
• Configurable via TOML — customize excluded commands, tee mode for failure recovery, and per-project filters in ~/.config/rtk/config.toml.
• Privacy-First Telemetry — opt-in only, GDPR-compliant anonymous aggregate metrics; no source code, file paths, or secrets are ever collected.
• Cross-Platform — available via Homebrew, curl installer, Cargo, or pre-built binaries for macOS, Linux, and Windows (with full hook support on WSL).