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rtk

rtk is a free, open-source software / service you can self-host or use without paying. High-performance CLI proxy that cuts up to 90% of the bash output your agent reads Website • Install • Troubleshooting • Architecture • Discord English • Francais • 中文 • 日本語 • 한국어 • Espanol • Português rtk filters and compresses command outputs before they reach your LLM context. Single Rust binary, 100+ supported commands, <10ms overhead. What RTK Does RTK intercepts shell commands and compresses their output before your agent reads it. Operation What RTK does to the output ls / tree Tree format with file counts instead of one line per entry cat / read Smart file reading: signatures and structure over full bodies grep / rg Truncates long lines, groups matches by file git status Compact stat format, grouped by state git diff Reduced context, headers stripped git log Hash, author and subject only git add/commit/push Confirmation line instead of full progress output cargo test / npm test Failures only, passing tests collapsed to a count ruff check Grouped by rule and file pytest Failures only, traceback trimmed go test NDJSON parsed, failures only docker ps Essential fields only How Savings Work RTK cuts up to 90% of the bash output your agent reads. That is what RTK measures, and it is not the same as cutting your bill by 90%. Bash output is one contributor to input tokens , alongside your prompt, the system prompt and conversation history. Input tokens are in turn only part of the bill , which also counts output tokens. The reduction dilutes at every step. The token counts RTK reports are estimated as bytes / 4 — RTK ships no tokenizer, so the percentages are reliable but the absolute token numbers are approximate . Full explanation: How RTK Savings Work Installation Homebrew (recommended) brew install rtk Quick Install (Linux/macOS) curl -fsSL https://raw.githubusercontent.com/rtk-ai/rtk/refs/heads/master/install.sh | sh Installs to ~/.local/bin . Add to PATH if needed: echo ' export PATH="$HOME/.local/bin:$PATH" ' >> ~ /.bashrc # or ~/.zshrc Cargo cargo install --git https://github.com/rtk-ai/rtk Pre-built Binaries Download from releases : macOS: rtk-x86_64-apple-darwin.tar.gz / rtk-aarch64-apple-darwin.tar.gz Linux: rtk-x86_64-unknown-linux-musl.tar.gz / rtk-aarch64-unknown-linux-gnu.tar.gz Windows: rtk-x86_64-pc-windows-msvc.zip Windows users : Extract the zip and place rtk.exe somewhere in your PATH (e.g. C:\Users\<you>\.local\bin ). Run RTK from Command Prompt , PowerShell , or Windows Terminal — do not double-click the .exe (it will flash and close). The full hook system works natively on Windows (and in WSL ). See Windows setup below for details. Verify Installation rtk --version # Should show "rtk 0.28.2" rtk gain # Should show the savings dashboard Name collision warning : Another project named "rtk" (Rust Type Kit) exists on crates.io. If rtk gain fails, you have the wrong package. Use cargo install --git above instead. Quick Start # 1. Install for your AI tool rtk init -g # Claude Code / Copilot (default) rtk init -g --gemini # Gemini CLI rtk init -g --codex # Codex (OpenAI) rtk init -g --agent cursor # Cursor rtk init -g --agent windsurf # Windsurf rtk init --agent cline # Cline / Roo Code rtk init --agent kilocode # Kilo Code rtk init --agent antigravity # Google Antigravity rtk init --agent kimi # Kimi AI rtk init -g --agent pi # Pi rtk init --agent hermes # Hermes rtk init -g --agent droid # Factory Droid # 2. Restart your AI tool, then test git status # Automatically rewritten to rtk git status Hook-based agents rewrite Bash commands (e.g., git status -> rtk git status ) before execution. Plugin-based agents, including Hermes, use their plugin API to rewrite commands before execution. The agent receives compact output without needing to call rtk explicitly. Important: the hook only runs on Bash tool calls. Claude Code built-in tools like Read , Grep , and Glob do not pass through the Bash hook, so they are not auto-rewritten. To get RTK's compact output for those workflows, use shell commands ( cat / head / tail , rg / grep , find ) or call rtk read , rtk grep , or rtk find directly. How It Works Without rtk: With rtk: Claude --git status--> shell --> git Claude --git status--> RTK --> git ^ | ^ | | | full raw output | | compact output | filter | +-----------------------------------+ +------- (filtered) ---+----------+ Four strategies applied per command type: Smart Filtering - Removes noise (comments, whitespace, boilerplate) Grouping - Aggregates similar items (files by directory, errors by type) Truncation - Keeps relevant context, cuts redundancy Deduplication - Collapses repeated log lines with counts Commands Percentages below are reductions in bash output , not reductions in your bill. See How Savings Work . Files rtk ls . # Compact directory tree rtk read file.rs # Smart file reading rtk read file.rs -l aggressive # Signatures only (strips bodies) rtk smart file.rs # 2-line heuristic code summary rtk find " *.rs " . # Compact find results rtk grep " pattern " . # Grouped search results rtk diff file1 file2 # Condensed diff (exit 1 if files differ) Git rtk git status # Compact status rtk git log -n 10 # One-line commits rtk git diff # Condensed diff rtk git add # -> "ok" rtk git commit -m " msg " # -> "ok abc1234" rtk git push # -> "ok main" rtk git pull # -> "ok 3 files +10 -2" GitHub CLI rtk gh pr list # Compact PR listing rtk gh pr view 42 # PR details + checks rtk gh issue list # Compact issue listing rtk gh run list # Workflow run status Test Runners rtk jest # Jest compact (failures only) rtk vitest # Vitest compact (failures only) rtk playwright test # E2E results (failures only) rtk pytest # Python tests (-90%) rtk go test # Go tests (NDJSON, -90%) rtk cargo test # Cargo tests (-90%) rtk rake test # Ruby minitest (-90%) rtk rspec # RSpec tests (JSON, -60%+) rtk err < cmd > # Filter errors only from any command rtk test < cmd > # Generic test wrapper - failures only (-90%) Build & Lint rtk lint # ESLint grouped by rule/file rtk lint biome # Supports other linters rtk tsc # TypeScript errors grouped by file rtk next build # Next.js build compact rtk prettier --check . # Files needing formatting rtk cargo build # Cargo build (-80%) rtk cargo clippy # Cargo clippy (-80%) rtk ruff check # Python linting (JSON, -80%) rtk golangci-lint run # Go linting (JSON, -85%) rtk rubocop # Ruby linting (JSON, -60%+) rtk sbt test # ScalaTest output (-90%) rtk sbt compile # Compilation errors only (-75%) rtk sbt run # Strip SBT preamble noise Package Managers rtk pnpm list # Compact dependency tree rtk uv run pytest # Preserve uv env, keep program output rtk pip list # Python packages (auto-detect uv) rtk pip outdated # Outdated packages rtk bundle install # Ruby gems (strip Using lines) rtk prisma generate # Schema generation (no ASCII art) AWS rtk aws sts get-caller-identity # One-line identity rtk aws ec2 describe-instances # Compact instance list rtk aws lambda list-functions # Name/runtime/memory (strips secrets) rtk aws logs get-log-events # Timestamped messages only rtk aws cloudformation describe-stack-events # Failures first rtk aws dynamodb scan # Unwraps type annotations rtk aws iam list-roles # Strips policy documents rtk aws s3 ls # Truncated with tee recovery Containers rtk docker ps # Compact container list rtk docker images # Compact image list rtk docker logs < container > # Deduplicated logs rtk docker compose ps # Compose services rtk kubectl pods # Compact pod list rtk kubectl logs < pod > # Deduplicated logs rtk kubectl services # Compact service list rtk oc get pods # OpenShift pod summary rtk oc get services # OpenShift service list rtk oc logs < pod > # Deduplicated logs Infrastructure as Code rtk pulumi preview # Strip header/URL/duration noise rtk pulumi up # Compact apply output rtk pulumi destroy # Compact destroy output rtk pulumi refresh # Drift summary rtk pulumi stack # Stack metadata (strips owner/timestamps) Data & Analytics rtk json config.json # Structure without values rtk deps # Dependencies summary rtk env -f AWS # Filtered env vars rtk log app.log # Deduplicated logs rtk curl < url > # Truncate + save full output rtk wget < url > # Download, strip progress bars rtk summary < long command > # Heuristic summary rtk proxy < command > # Raw passthrough + tracking Token Savings Analytics rtk gain # Summary stats rtk gain --graph # ASCII graph (last 30 days) rtk gain --history # Recent command history rtk gain --daily # Day-by-day breakdown rtk gain --all --format json # JSON export for dashboards rtk discover # Find missed savings opportunities rtk discover --all --since 7 # All projects, last 7 days rtk session # Show RTK adoption across recent sessions Global Flags -u, --ultra-compact # ASCII icons, inline format (further output reduction) -v, --verbose # Increase verbosity (-v, -vv, -vvv) Examples Directory listing: # ls -la (45 lines) # rtk ls (12 lines) drwxr-xr-x 15 user staff 480 ... my-project/ -rw-r--r-- 1 user staff 1234 ... +-- src/ (8 files) ... | +-- main.rs +-- Cargo.toml Git operations: # git push (15 lines) # rtk git push (1 line) Enumerating objects: 5, done. ok main Counting objects: 100% (5/5), done. Delta compression using up to 8 threads ... Test output: # cargo test (200+ lines on failure) # rtk test cargo test (~20 lines) running 15 tests FAILED: 2/15 tests test utils::test_parse ... ok test_edge_case: assertion failed test utils::test_format ... ok test_overflow: panic at utils.rs:18 ... Auto-Rewrite Hook The most effective way to use rtk. The hook transparently intercepts Bash commands and rewrites them to rtk equivalents before execution. Result : 100% rtk adoption across all conversations and subagents, with no per-command context overhead. Scope note: this only applies to Bash tool calls. Claude Code built-in tools such as Read , Grep , and Glob bypass the hook, so use shell commands or explicit rtk commands when you want RTK filtering there. Setup rtk init -g # Install hook + RTK.md (recommended) rtk init -g --opencode # OpenCode plugin (instead of Claude Code) rtk init -g --auto-patch # Non-interactive (CI/CD) rtk init -g --hook-only # Hook only, no RTK.md rtk init --show # Verify installation After install, restart Claude Code . Windows RTK works fully on native Windows. Since v0.37.2 the auto-rewrite hook runs as a native binary command ( rtk hook claude ) — no Unix shell, bash, or jq required — so commands are rewritten transparently on Command Prompt, PowerShell, and Windows Terminal, just like on Linux and macOS. Native Windows # 1. Download and extract rtk-x86_64-pc-windows-msvc.zip from releases # 2. Add rtk.exe to your PATH (e.g. C:\Users\<you>\.local\bin) # 3. Initialize — installs the native binary hook rtk init - g Upgrading from an older install? If you set RTK up before v0.37.2 you may still have the legacy rtk-rewrite.sh shell hook (which does need a Unix shell). Re-run rtk init -g to migrate to the native binary hook. Prerequisites : some filters shell out to ripgrep ( rg ). Install it and keep it on your PATH (e.g. winget install BurntSushi.ripgrep.MSVC ) to avoid Binary 'rg' not found on PATH warnings. Important : Do not double-click rtk.exe — it is a CLI tool that prints usage and exits immediately. Always run it from a terminal (Command Prompt, PowerShell, or Windows Terminal). WSL WSL also works and behaves exactly like Linux: # Inside WSL curl -fsSL https://raw.githubusercontent.com/rtk-ai/rtk/refs/heads/master/install.sh | sh rtk init -g Feature Native Windows WSL Filters (cargo, git, etc.) Full Full Auto-rewrite hook Yes (native binary) Yes rtk init -g Hook mode Hook mode rtk gain / analytics Full Full Supported AI Tools RTK supports 16 AI coding tools. Each integration rewrites shell commands to rtk equivalents, reducing the bash output the agent reads where the agent supports command interception. Tool Install Method Claude Code rtk init -g PreToolUse hook (native binary) GitHub Copilot (VS Code) rtk init -g --copilot PreToolUse hook — transparent rewrite GitHub Copilot CLI rtk init -g --copilot PreToolUse deny-with-suggestion (CLI limitation) Cursor rtk init -g --agent cursor preToolUse hook (hooks.json) Gemini CLI rtk init -g --gemini BeforeTool hook Codex rtk init -g --codex AGENTS.md + RTK.md instructions Windsurf rtk init -g --agent windsurf .windsurfrules (project-scoped) Cline / Roo Code rtk init --agent cline .clinerules (project-scoped) OpenCode rtk init -g --opencode Plugin TS (tool.execute.before) OpenClaw openclaw plugins install ./openclaw Plugin TS (before_tool_call) Pi rtk init -g --agent pi (global) TypeScript extension (tool_call) Hermes rtk init --agent hermes Python plugin adapter (terminal command mutation via rtk rewrite ) Mistral Vibe rtk init -g --agent vibe pre_tool hook (hooks.toml) Kilo Code rtk init --agent kilocode .kilocode/rules/rtk-rules.md (project-scoped) Google Antigravity rtk init --agent antigravity .agents/rules/antigravity-rtk-rules.md (project-scoped) Kimi AI rtk init --agent kimi AGENTS.md (project-scoped) Factory Droid rtk init -g --agent droid (or per-project) PreToolUse hook in ~/.factory/hooks.json (matcher Execute ) For per-agent setup details, override controls, and graceful degradation, see the Supported Agents guide . The Hermes plugin source and tests live in hooks/hermes/ ; installed Hermes runtime files still live under ~/.hermes/plugins/rtk-rewrite/ . Configuration ~/.config/rtk/config.toml (macOS: ~/Library/Application Support/rtk/config.toml ): [ hooks ] exclude_commands = [ " curl " , " playwright " ] # skip rewrite for these [ tee ] enabled = true # save raw output on failure (default: true) mode = " failures " # "failures", "always", or "never" When a command fails, RTK saves the full unfiltered output so the LLM can read it without re-executing: FAILED: 2/15 tests [full output: ~/.local/share/rtk/tee/1707753600_cargo_test.log] For the full config reference (all sections, env vars, per-project filters), see the Configuration guide . Uninstall rtk init -g --uninstall # Remove hook, RTK.md, settings.json entry cargo uninstall rtk # Remove binary brew uninstall rtk # If installed via Homebrew Documentation rtk-ai.app/guide — full user guide (installation, supported agents, what gets optimized, analytics, configuration, troubleshooting) INSTALL.md — detailed installation reference ARCHITECTURE.md — system design and technical decisions CONTRIBUTING.md — contribution guide SECURITY.md — security policy Privacy & Telemetry RTK can collect anonymous, aggregate usage metrics once per day. Telemetry is disabled by default and requires explicit opt-in consent (GDPR Art. 6, 7) during rtk init or via rtk telemetry enable . This data helps us build a better product: identifying which commands need filters, which filters need improvement, and how much value RTK delivers. For the full list of fields, data handling, and contributor guidelines, see docs/TELEMETRY.md . What is collected and why: Category Data Why Identity Salted device hash (SHA-256, not reversible) Count unique installations without tracking individuals Environment RTK version, OS, architecture, install method Know which platforms to support and test Usage volume Command count (24h), total commands, estimated tokens saved (24h/30d/total) Measure adoption and value delivered Quality Top 5 passthrough commands (0% reduction), parse failure count, commands with <30% reduction Identify missing filters and weak ones to improve Ecosystem Command category distribution (e.g. git 45%, cargo 20%, js 15%) Prioritize filter development for popular ecosystems Retention Days since first use, active days in last 30 Understand engagement and detect churn Adoption AI agent hook type (claude/gemini/codex), custom TOML filter count Track integration coverage and DSL adoption Configuration Whether config.toml exists, number of excluded commands, project count Understand user maturity and customization patterns Features Usage counts for meta-commands (gain, discover, proxy, verify) Know which RTK features are valued vs unused Economics Estimated USD value, derived from the estimated tokens saved and a fixed internal constant Quantify the value RTK provides to users All data is aggregate counts or anonymized command names (first 3 words, no arguments). Top commands report only tool names (e.g. "git", "cargo"), never full command lines. What is NOT collected: source code, file paths, command arguments, secrets, environment variables, personal data, or repository contents. Manage telemetry: rtk telemetry status # Check current consent state rtk telemetry enable # Give consent (interactive prompt) rtk telemetry disable # Withdraw consent — stops all collection immediately rtk telemetry forget # Withdraw consent + delete all local data + request server-side erasure Override via environment: export RTK_TELEMETRY_DISABLED=1 # Blocks telemetry regardless of consent Star History StarMapper Core team Patrick Szymkowiak — Founder GitHub · LinkedIn Florian Bruniaux — Core contributor GitHub · LinkedIn Adrien Eppling — Core contributor GitHub · LinkedIn Nicolas Le Cam — Core contributor Github · LinkedIn Takayuki Maeda — Core contributor GitHub · LinkedIn Contributing Contributions welcome! Please open an issue or PR on GitHub . Join the community on Discord . License Apache License 2.0 - see LICENSE for details. Disclaimer See DISCLAIMER.md .

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