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www.rtk-ai.app
RTK — Rust Token Killer
Compress tool output and route heavy work to cheaper models for AI coding agents.
RTK — Rust Token Killer is a cost reduction engine that compresses AI coding agents’ tool output and optionally routes heavy work to cheaper models. RTK — Rust Token Killer serves developers and teams through a free, open-source Rust CLI under Apache 2.0, with no accounts or usage limits.
RTK — Rust Token KillerPreview unavailable
At a glance
- Pricing
- FreeThe CLI is free with no usage limits or accounts. Optional model routing uses a user-supplied model key. RTK Pro is available for teams; no price is stated.
- Added
- 28 Oct 2026
About RTK — Rust Token Killer
RTK — Rust Token Killer is a cost reduction engine for developers using AI coding agents. Written in Rust, the open-source CLI compresses the information agents read, including shell output, file reads, search results, web pages and MCP calls.
RTK — Rust Token Killer automatically rewrites shell commands through agent hooks and removes repetitive output before the agent reads it. The website reports average output reduction of 56% on rewritten commands, with results depending on the command. Configurable pipelines define where compression or routing happens, allow heavy tasks to use a cheaper model, and can be shared across supported agents. An optional proxy trims API traffic, while the rtk gain command reports measured savings.
RTK — Rust Token Killer is free under the Apache 2.0 license, with no accounts, usage limits or API keys required for the core CLI. Installation options include Homebrew, an installation script for macOS and Linux, and pre-built binaries for macOS, Linux and Windows. Optional model routing requires a model key supplied by the user.
RTK — Rust Token Killer suits developers and teams using tools such as Claude Code, Cursor, Codex and Gemini CLI. Community pipelines require review because they can rewrite commands and send content to declared models; shared pipelines are not reviewed by the project.
What you can do
- Automatic shell-command rewriting and output compression
- Compression for file reads, search, web fetches and MCP calls
- Rule-based routing to cheaper models
- Configurable, shareable pipeline files
- Optional API traffic filtering through RTK Proxy
- Savings measurement with rtk gain
- Support for Claude Code, Cursor, Codex and Gemini CLI
- Pre-built binaries for macOS, Linux and Windows
Pros and cons
What works
- Free CLI with no usage limits or account requirement
- Open-source Rust CLI under Apache 2.0
- Pipeline files work across supported agents
- Telemetry is opt-in and collects no personal data
What to watch
- Optional model routing requires a user-supplied model key
- Community pipelines are not reviewed and can rewrite commands or send content to declared models
- Token savings vary by command
Who RTK — Rust Token Killer is for
Developers and teams using AI coding agents
- Reduce terminal output entering an AI agent's context
- Compress file reads, search results and MCP responses
- Route large file reads to cheaper models
- Share agent compression rules across a development team
- Measure token savings from rewritten commands
RTK — Rust Token Killer FAQ
What is RTK — Rust Token Killer?
RTK — Rust Token Killer is a cost reduction engine for AI coding agents that compresses shell output, file reads, search results, web pages and MCP calls. Configurable pipelines can also route heavy work to cheaper models and share processing rules across supported agents.
Is RTK — Rust Token Killer free?
RTK — Rust Token Killer provides a completely free CLI under the Apache 2.0 license, with no usage limits, accounts or API keys required. Optional routing to cheaper models uses a model key supplied by the user. A separate team offering, RTK Pro, is also available.
Which AI coding tools does RTK — Rust Token Killer support?
RTK — Rust Token Killer supports AI coding tools including Claude Code, Cursor, GitHub Copilot, Codex, Gemini CLI, Windsurf, Cline and Aider. Agent hooks automatically rewrite shell commands and compress output, while an optional proxy also acts on API traffic.
How much output does RTK — Rust Token Killer reduce?
RTK — Rust Token Killer reports 56% average output reduction on commands it rewrites and up to 90% on the noisiest commands. Actual savings depend on the command. Developers can use rtk gain to measure savings from their own usage.
Can teams share RTK — Rust Token Killer pipelines?
RTK — Rust Token Killer supports sharing pipelines as files or links that work across supported agents. Pipelines define where processing happens, when rules apply and what actions run. Community pipelines are not reviewed and can rewrite commands or send content to declared models.
How do you install RTK — Rust Token Killer?
RTK — Rust Token Killer offers an installation script and Homebrew installation for macOS and Linux, plus pre-built binaries for macOS, Linux and Windows. After installation, developers activate agent hooks with rtk init --global or an agent-specific setup command.
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