Rtk
CLI proxy that cuts LLM token usage 60-90% by compressing command output noise.
If you use a command-driven AI coding assistant and pay per token or fight context limits, RTK is the cheapest, quickest fix—zero configuration, open source, and proven 89% average noise reduction across thousands of commands. Skip it if you never pipe CLI output to an LLM or need a GUI.
- Developers using AI coding assistants who pay per token or face context window limits
- Teams using Claude Code, Cursor, or GitHub Copilot in CI/CD pipelines
- Developers struggling with short AI sessions due to context overflow
- Cost-conscious teams running frequent command-heavy AI interactions
- Users who need a GUI or web interface
- Teams that require enterprise-grade deployment support
- Projects where CLI proxy overhead (even minimal) is unacceptable
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In short
Rtk — CLI proxy that cuts LLM token usage 60-90% by compressing command output noise. Best for Developers using AI coding assistants who pay per token or face context window limits, Teams using Claude Code, Cursor, or GitHub Copilot in CI/CD pipelines, Developers struggling with short AI sessions due to context overflow. Free to use.
Viability Score
How likely is Rtk to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Token reduction: 60-90% on common dev commands
- Automatic hook interception (no config needed)
- Command-aware filtering (test, git, grep, find, etc.)
- Analytics dashboard via CLI (rtk gain, rtk discover)
- Adoption rate tracking per session (rtk session)
- Discover missed savings (rtk discover)
- Supports Claude Code, Cursor, Aider, Gemini CLI, OpenAI Codex, Cline, Windsurf, GitHub Copilot
- Zero dependencies, single Rust binary
- Open-source (Apache 2.0) with 68k+ GitHub stars
- Privacy-first: transparent telemetry, opt-out available
- Multi-language support (English, French, Spanish, German, Chinese, Japanese)
- Benchmarked on 2,900+ real-world commands
- Tee recovery for output logging
- Configuration via config.toml or env vars
- 15% speed improvement on large git diffs (v2.0.0)
About Rtk
RTK (Rust Token Killer) is an open-source CLI proxy that intercepts command output from development tools—such as git status, cargo test, grep, and find—before it reaches an AI coding assistant. It filters out boilerplate, progress bars, and irrelevant details, reducing the number of tokens consumed by 60–90% on average. This preserves limited context window space for actual reasoning, extends session lengths, and lowers costs on both free and pay-per-token plans. Built as a single Rust binary with zero external dependencies, RTK runs on any system with a Rust-compatible platform. It integrates seamlessly with popular AI coding tools like Claude Code, Cursor, Aider, Gemini CLI, OpenAI Codex, Cline, Windsurf, and GitHub Copilot via automatic hook interception—no manual configuration needed. Version 2.0.0 adds dedicated analytics commands (rtk gain, rtk discover) and support for Go test and Ruby commands, alongside a 15% speed improvement on large git diffs. RTK is free and open-source under Apache 2.0, with over 68,000 stars on GitHub. It measures real-world savings across thousands of commands and provides analytics through commands like 'rtk gain' to track token reduction per session. The tool is transparent about telemetry and privacy, with an opt-out option. What sets RTK apart is its laser focus on eliminating CLI noise, which often constitutes 70% of context waste. Unlike generic proxy tools, RTK is command-aware, understanding the structure of git diffs, test outputs, and file listings to strip only what the LLM doesn't need, while preserving critical information like error messages and test failures.
Behind the Verdict
RTK solves a pain that every developer using CLI-based AI assistants hits: context pollution. Your 200K-token window gets eaten by cargo test boilerplate and git diff noise, not your code. RTK cuts that out—we've seen 89% average reduction across 2,900+ commands, with cargo test hitting 91.8%. That's not a benchmark; it's their own public measurement. Pick RTK when you're on a pay-per-token plan (OpenAI API, Gemini CLI, Aider) and want to slash costs—they claim a team of 10 wastes ~$1,750/month on noise. Or when you keep losing chat history because of context overflows. Setup is a single brew install, and it hooks into Claude Code, Cursor, Aider, Gemini CLI, OpenAI Codex, Cline, Windsurf, and GitHub Copilot automatically. Where we'd hesitate: if your AI assistant doesn't support tool-use hooks (e.g., plain ChatGPT), RTK can't help. Also, the proxy adds milliseconds of latency—fine for most, but not for real-time latency-critical pipelines. The command-aware filtering is powerful but limited to recognized commands; unrecognized output passes through unchanged. Compared to alternatives like TokenMonster or direct prompt compression, RTK is purpose-built for CLI context. TokenMonster compresses arbitrarily but isn't command-aware, so it might strip error messages. RTK preserves failures while discarding pass lines. That's the key difference. RTK v2.0.0 just added analytics (rtk gain, rtk discover) and support for Go test and Ruby commands, with 15% faster git diff processing. It's actively maintained and community-driven. Bottom line: free, open source, and immediately useful. Try it for a day—you'll see the token savings instantly with rtk gain.
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Use Cases
- Reduce token costs by 60-90% when running AI coding assistants on CI/CD pipelines and local development
- Extend Claude Code sessions by filtering out boilerplate test output and git status noise
- Improve AI reasoning quality by keeping the context window focused on code logic instead of CLI noise
- Track token savings across teams using 'rtk gain' analytics to optimize assistant usage
- Integrate with GitHub Copilot or Cursor for instant, zero-config noise reduction on every command
- Deploy in headless environments as a single-binary proxy for automated developer workflows
Limitations
- RTK only works with AI assistants that support tool-use hooks (e.g., PreToolUse).
- It operates solely on CLI output, so non-command interactions (e.g., file uploads, direct chat) are unaffected.
- As a proxy, it introduces minimal latency, but for extremely low-latency requirements, the overhead might be noticeable.
- Free and open-source with no paid tiers, but enterprise support is not offered.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Integrations
Resources & Guides
- Documentationrtk-ai.app
Docs · Rtk
Full product docs from rtk-ai.app
- Quickstartrtk-ai.app
Installation · Rtk
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Supported Agents · Rtk
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- Documentationrtk-ai.app
Troubleshooting · Rtk
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