RTK (Rust Token Killer)

RTK filters command output before an AI coding assistant reads it. It's for developers whose agents spend too much context on build logs, passing tests and repetitive terminal output.

• Build and test summaries: Collapses compilation progress and passing tests into summaries while keeping failures and warnings visible, with support for Cargo, pytest, Go and npm tests.
• Git and file searches: Condenses Git status, diffs and logs, groups search matches by file, and summarizes directory listings so agents receive less repetitive text.
• Coding assistant integrations: Works with Claude Code, Cursor, Codex, Gemini CLI and other assistants that read terminal output, with automatic command rewriting in supported integrations.
• Savings reports: Shows output reductions by command over daily, weekly and monthly periods so you can assess the effect on your own projects.

The free, open-source CLI runs on your machine on macOS, Linux or Windows under the Apache 2.0 license. It doesn't require an account or API key. Telemetry is off by default; opting in sends aggregate usage metrics, but excludes source code, file paths, command arguments and repository contents.

Output reduction varies by command and doesn't translate directly into the same reduction in your AI bill. Token totals are estimates rather than tokenizer measurements. Filtering can shorten search results and reduce diff context.

RTK Pro is a separate paid team service that connects local installations for usage and cost analytics, security guardrails, and access governance.