rtk-ai__rtk/README.md

<p align="center">
  <img src="https://avatars.githubusercontent.com/u/258253854?v=4" alt="RTK - Rust Token Killer" width="500">
</p>

<p align="center">
  <strong>High-performance CLI proxy that reduces LLM token consumption by 60-90%</strong>
</p>

<p align="center">
  <a href="https://github.com/rtk-ai/rtk/actions"><img src="https://github.com/rtk-ai/rtk/workflows/Security%20Check/badge.svg" alt="CI"></a>
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  <a href="https://formulae.brew.sh/formula/rtk"><img src="https://img.shields.io/homebrew/v/rtk" alt="Homebrew"></a>
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<p align="center">
  <a href="https://www.rtk-ai.app">Website</a> &bull;
  <a href="#installation">Install</a> &bull;
  <a href="docs/TROUBLESHOOTING.md">Troubleshooting</a> &bull;
  <a href="ARCHITECTURE.md">Architecture</a> &bull;
  <a href="https://discord.gg/RySmvNF5kF">Discord</a>
</p>

<p align="center">
  <a href="README.md">English</a> &bull;
  <a href="README_fr.md">Francais</a> &bull;
  <a href="README_zh.md">中文</a> &bull;
  <a href="README_ja.md">日本語</a> &bull;
  <a href="README_ko.md">한국어</a> &bull;
  <a href="README_es.md">Espanol</a>
</p>

---

rtk filters and compresses command outputs before they reach your LLM context. Single Rust binary, zero dependencies, <10ms overhead.

## Token Savings (30-min Claude Code Session)

| Operation | Frequency | Standard | rtk | Savings |
|-----------|-----------|----------|-----|---------|
| `ls` / `tree` | 10x | 2,000 | 400 | -80% |
| `cat` / `read` | 20x | 40,000 | 12,000 | -70% |
| `grep` / `rg` | 8x | 16,000 | 3,200 | -80% |
| `git status` | 10x | 3,000 | 600 | -80% |
| `git diff` | 5x | 10,000 | 2,500 | -75% |
| `git log` | 5x | 2,500 | 500 | -80% |
| `git add/commit/push` | 8x | 1,600 | 120 | -92% |
| `cargo test` / `npm test` | 5x | 25,000 | 2,500 | -90% |
| `ruff check` | 3x | 3,000 | 600 | -80% |
| `pytest` | 4x | 8,000 | 800 | -90% |
| `go test` | 3x | 6,000 | 600 | -90% |
| `docker ps` | 3x | 900 | 180 | -80% |
| **Total** | | **~118,000** | **~23,900** | **-80%** |

> Estimates based on medium-sized TypeScript/Rust projects. Actual savings vary by project size.

## Installation

### Homebrew (recommended)

```bash
brew install rtk
```

### Quick Install (Linux/macOS)

```bash
curl -fsSL https://raw.githubusercontent.com/rtk-ai/rtk/refs/heads/master/install.sh | sh
```

> Installs to `~/.local/bin`. Add to PATH if needed:
> ```bash
> echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.bashrc  # or ~/.zshrc
> ```

### Cargo

```bash
cargo install --git https://github.com/rtk-ai/rtk
```

### Pre-built Binaries

Download from [releases](https://github.com/rtk-ai/rtk/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`

### Verify Installation

```bash
rtk --version   # Should show "rtk 0.28.2"
rtk gain        # Should show token savings stats
```

> **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

```bash
# 1. Install hook for Claude Code (recommended)
rtk init --global
# Follow instructions to register in ~/.claude/settings.json
# Claude Code only by default (use --opencode for OpenCode, --gemini for Gemini CLI)

# 2. Restart Claude Code, then test
git status  # Automatically rewritten to rtk git status
```

The hook transparently rewrites Bash commands (e.g., `git status` -> `rtk git status`) before execution. Claude never sees the rewrite, it just gets compressed output.

**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
    ^                                   |            ^                      |          |
    |        ~2,000 tokens (raw)        |            |   ~200 tokens        | filter   |
    +-----------------------------------+            +------- (filtered) ---+----------+
```

Four strategies applied per command type:

1. **Smart Filtering** - Removes noise (comments, whitespace, boilerplate)
2. **Grouping** - Aggregates similar items (files by directory, errors by type)
3. **Truncation** - Keeps relevant context, cuts redundancy
4. **Deduplication** - Collapses repeated log lines with counts

## Commands

### Files
```bash
rtk ls .                        # Token-optimized 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
```

### Git
```bash
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
```bash
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
```bash
rtk test cargo test             # Show failures only (-90%)
rtk err npm run build           # Errors/warnings only
rtk vitest run                  # 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%+)
```

### Build & Lint
```bash
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%+)
```

### Package Managers
```bash
rtk pnpm list                   # Compact dependency tree
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)
```

### Containers
```bash
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
```

### Data & Analytics
```bash
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>                  # Auto-detect JSON + schema
rtk wget <url>                  # Download, strip progress bars
rtk summary <long command>      # Heuristic summary
rtk proxy <command>             # Raw passthrough + tracking
```

### Token Savings Analytics
```bash
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

```bash
-u, --ultra-compact    # ASCII icons, inline format (extra token savings)
-v, --verbose          # Increase verbosity (-v, -vv, -vvv)
```

## Examples

**Directory listing:**
```
# ls -la (45 lines, ~800 tokens)        # rtk ls (12 lines, ~150 tokens)
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, ~200 tokens)       # rtk git push (1 line, ~10 tokens)
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, zero token 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

```bash
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**.

## Gemini CLI Support (Global)

RTK supports Gemini CLI via a native Rust hook processor. The hook intercepts `run_shell_command` tool calls and rewrites them to `rtk` equivalents using the same rewrite engine as Claude Code.

**Install Gemini hook:**
```bash
rtk init -g --gemini
```

**What it creates:**
- `~/.gemini/hooks/rtk-hook-gemini.sh` (thin wrapper calling `rtk hook gemini`)
- `~/.gemini/GEMINI.md` (RTK awareness instructions)
- Patches `~/.gemini/settings.json` with BeforeTool hook

**Uninstall:**
```bash
rtk init -g --gemini --uninstall
```

**Restart Required**: Restart Gemini CLI, then test with `git status` in a session.

## OpenCode Plugin (Global)

OpenCode supports plugins that can intercept tool execution. RTK provides a global plugin that mirrors the Claude auto-rewrite behavior by rewriting Bash tool commands to `rtk ...` before they execute. This plugin is **not** installed by default.

> **Note**: This plugin uses OpenCode's `tool.execute.before` hook. Known limitation: plugin hooks do not intercept subagent tool calls ([upstream issue](https://github.com/sst/opencode/issues/5894)). See [OpenCode plugin docs](https://open-code.ai/en/docs/plugins) for API details.

**Install OpenCode plugin:**
```bash
rtk init -g --opencode
```

**What it creates:**
- `~/.config/opencode/plugins/rtk.ts`

**Restart Required**: Restart OpenCode, then test with `git status` in a session.

**Manual install (fallback):**
```bash
mkdir -p ~/.config/opencode/plugins
cp hooks/opencode-rtk.ts ~/.config/opencode/plugins/rtk.ts
```

### Commands Rewritten

| Raw Command | Rewritten To |
|-------------|-------------|
| `git status/diff/log/add/commit/push/pull` | `rtk git ...` |
| `gh pr/issue/run` | `rtk gh ...` |
| `cargo test/build/clippy` | `rtk cargo ...` |
| `cat/head/tail <file>` | `rtk read <file>` |
| `rg/grep <pattern>` | `rtk grep <pattern>` |
| `ls` | `rtk ls` |
| `vitest/jest` | `rtk vitest run` |
| `tsc` | `rtk tsc` |
| `eslint/biome` | `rtk lint` |
| `prettier` | `rtk prettier` |
| `playwright` | `rtk playwright` |
| `prisma` | `rtk prisma` |
| `ruff check/format` | `rtk ruff ...` |
| `pytest` | `rtk pytest` |
| `pip list/install` | `rtk pip ...` |
| `go test/build/vet` | `rtk go ...` |
| `golangci-lint` | `rtk golangci-lint` |
| `rake test` / `rails test` | `rtk rake test` |
| `rspec` / `bundle exec rspec` | `rtk rspec` |
| `rubocop` / `bundle exec rubocop` | `rtk rubocop` |
| `bundle install/update` | `rtk bundle ...` |
| `docker ps/images/logs` | `rtk docker ...` |
| `kubectl get/logs` | `rtk kubectl ...` |
| `curl` | `rtk curl` |
| `pnpm list/outdated` | `rtk pnpm ...` |

Commands already using `rtk`, heredocs (`<<`), and unrecognized commands pass through unchanged.

## Configuration

### Config File

`~/.config/rtk/config.toml` (macOS: `~/Library/Application Support/rtk/config.toml`):

```toml
[tracking]
database_path = "/path/to/custom.db"  # default: ~/.local/share/rtk/history.db

[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"
max_files = 20          # rotation limit
```

### Tee: Full Output Recovery

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]
```

### Uninstall

```bash
rtk init -g --uninstall     # Remove hook, RTK.md, settings.json entry
cargo uninstall rtk          # Remove binary
brew uninstall rtk           # If installed via Homebrew
```

## Documentation

- **[TROUBLESHOOTING.md](docs/TROUBLESHOOTING.md)** - Fix common issues
- **[INSTALL.md](INSTALL.md)** - Detailed installation guide
- **[ARCHITECTURE.md](ARCHITECTURE.md)** - Technical architecture
- **[SECURITY.md](SECURITY.md)** - Security policy and PR review process
- **[AUDIT_GUIDE.md](docs/AUDIT_GUIDE.md)** - Token savings analytics guide

## Privacy & Telemetry

RTK collects **anonymous, aggregate usage metrics** once per day to help prioritize development. This is standard practice for open-source CLI tools.

**What is collected:**
- Device hash (SHA-256 of hostname+username, not reversible)
- RTK version, OS, architecture
- Command count (last 24h) and top command names (e.g. "git", "cargo" — no arguments, no file paths)
- Token savings percentage

**What is NOT collected:** source code, file paths, command arguments, secrets, environment variables, or any personally identifiable information.

**Opt-out** (any of these):
```bash
# Environment variable
export RTK_TELEMETRY_DISABLED=1

# Or in config file (~/.config/rtk/config.toml)
[telemetry]
enabled = false
```

## Contributing

Contributions welcome! Please open an issue or PR on [GitHub](https://github.com/rtk-ai/rtk).

Join the community on [Discord](https://discord.gg/RySmvNF5kF).

## License

MIT License - see [LICENSE](LICENSE) for details.