01 FEATURE
Single static binary, no runtime.
Pure Rust, single-threaded by design. Zero tokio, zero async-std. Cold start under 5 ms — every shell call stays cheap.
Strip the noise
from every shell command
before it hits the model.
SIGNAL · STDIN → MODEL CTX CYCLE 0.4.2 · 8MB · NO ASYNC
01 / 05 FIELD TELEMETRY
Live numbers from the
field — not marketing.
Every tok0 instance reports anonymous compression metrics back to api.tok0.dev. The four numbers below are the real, current state of the deployed fleet — refreshed on every page load.
01 · Tokens compressed
9.96M
Cumulative · all tracked instances
02 · Avg. savings
82.1%
Across every wrapped command
03 · Active instances
12
Reporting in last 10 days
04 · Commands run · 30 d
9,608
14 day rolling window
● Live · api.tok0.dev/statsGENERATED · 2026-05-02 17:54:14 UTC
[ 30-DAY SAVED TOKENS ] 14 POINTS · 8.92M TOTAL
2026-04-18 2026-05-01
Top commands · by tokens saved
- 17.25Mnpm install 13,395 runs
- 16.70Mgit log 12,688 runs
- 16.64Mgit diff 14,497 runs
- 12.57Mcargo build 9,870 runs
- 10.99Mdocker build 8,817 runs
- 10.19Mpnpm install 8,084 runs
SOURCE · D1 · command_stats ▶ /stats
[ FLEET BREAKDOWN ] 12 INSTANCES
By operating system
- macos-aarch64 4 · 33%
- linux-x86_64 4 · 33%
- linux-aarch64 2 · 17%
- windows-x86_64 1 · 8%
- macos-x86_64 1 · 8%
By country
US 2AU 1BR 1DE 1FR 1GB 1
By version
v0.4.2 9
v0.4.1 2
v0.4.0 1
SOURCE · D1 · instances ● LIVE
02 / 05 SYSTEM SPECIFICATION
Built like a piece
of infrastructure.
Six non-negotiables. Each one is a CI gate, not a marketing claim.
02 FEATURE
Deterministic compression pipeline.
Strip ANSI · pattern replace · output match · line select · truncate · head/tail window · hard cap · empty fallback. Pure functions, fully testable.
03 FEATURE
Declarative rules, embedded at build.
100+ built-in TOML compression rules across git, cargo, npm, docker, kubectl, terraform, pytest, and more — each with min-savings assertions baked into CI.
04 FEATURE
Auto-installs into your agent.
tok0 init detects Claude Code, Cursor, Gemini CLI, Windsurf, Cline, Amp, OpenCode, Codex, Kimi Code — drops the right hook or rule file in the right place.
05 FEATURE
Never blocks your terminal.
If a filter errors, tok0 passes through the raw command output unchanged. Exit codes propagate exactly. Your CI never breaks because of compression.
06 FEATURE
Telemetry stays on your machine.
SQLite token meter at ~/.config/tok0. No account, no API key, no upload by default. Cloud feature is gated and opt-in only.
03 / 05 COMPATIBLE SYSTEMS
Drops into the
agent you already use.
One tok0 init auto-detects every supported AI tool on your machine and installs the right hook, rule file, or AGENTS.md entry. Manual escape hatch for the GUI-only ones.
[ AI TOOLS ] 9 SUPPORTED · 7 AUTO-INSTALL
| Tool | Surface | Status |
|---|---|---|
| Claude Code PreToolUse hook | ~/.claude/settings.json | Auto-install |
| Cursor rules file paste-in | Settings → Rules | Paste-in |
| Gemini CLI auto-loaded instructions | ~/.gemini/GEMINI.md | Auto-install |
| Windsurf global rules file | ~/.codeium/windsurf/memories/… | Auto-install |
| Cline Cline Rules toggle | ~/Documents/Cline/Rules/tok0.md | Auto-install |
| Amp AGENTS.md auto-load | ~/.config/amp/AGENTS.md | Auto-install |
| OpenCode AGENTS.md auto-load | ~/.config/opencode/AGENTS.md | Auto-install |
| Codex AGENTS.md (manual) | ~/.codex/AGENTS.md | Manual |
| Kimi Code manual paste-in | ~/.kimi/tok0.md | Paste-in |
SOURCE · apps/cli/src/bridge/setup.rs ▶ tok0 init
[ COMMANDS COMPRESSED ] 250+ TOTAL · CI-VERIFIED FLOORS
tok0 ships 100+ TOML compression rules and 52 native Rust compressors covering git, package managers, build tools, container/cloud CLIs, linters, test runners, and database clients. Floor savings shown below are CI-asserted minimums — real-world numbers run higher.
git diff −83%git log −78%cargo build −72%cargo test −68%cargo clippy −74%npm install −80%pnpm install −81%bun install −79%tsc −66%vitest −71%next build −70%docker build −84%kubectl get −69%terraform plan −77%pytest −73%ruff check −65%go build −67%gradle build −76%aws s3 ls −72%gh pr list −68%brew install −85%apt install −82% + 228 MORE
SOURCE · apps/cli/src/rules/*.toml + compressors/ 100 TOML · 52 RUST
04 / 05 OPERATIONAL MANIFEST
Rules of engagement.
- 01 Wraps any CLI Zero config
- 02 Strips ANSI / banners Deterministic
- 03 Preserves exit codes Always
- 04 Falls back on filter error Never blocks
- 05 Open source MIT
- 06 No account required Local-first
[ SYSTEM LOG ] tok0 status
$ tok0 status # INIT.................OK # BRIDGE HOOK..........CONNECTED · claude-code # RULES CACHE..........WARM · 100 rules · 12 ms # METER................ACTIVE · 1,247 ops today # TELEMETRY............LOCAL · ~/.config/tok0/db # EXIT CODE PROPAGATION.VERIFIED # FALLBACK SAFETY......ARMED — ready —
FIELD SPEC · TOK0/0.4.2 ● ALL SYSTEMS NOMINAL
05 / 05 READY IN 12 SECONDS
Stop paying
for tokens
you never needed.
One install. tok0 auto-detects your AI tool, installs the right hook, and starts compressing every command your agent runs. No flags, no config, no account.