How to install the double-o crate // Lib.rs

Double-o is both an executable binary that can be run, and a library that can be used in Rust programs.

Installing the `oo` executable

Assuming you have Rust/Cargo installed, run this command in a terminal:

cargo install double-o

It will make the oo command available in your PATH if you've allowed the PATH to be modified when installing Rust. cargo uninstall double-o uninstalls.

Adding `double_o` library as a dependency

Run this command in a terminal, in your project's directory:

cargo add double-o

To add it manually, edit your project's Cargo.toml file and add to the [dependencies] section:

double-o = "0.3.2"

The double_o library will be automatically available globally. Read the double_o library documentation.

Back to the crate overview.

Readme

"Double-o, agent's best friend."

Or: how I learned to stop worrying and love my context-efficient command runner for AI coding agents.

The Problem

AI agents see everything you print. A cargo test run producing 8 KB of output costs the agent hundreds of tokens just to learn "tests passed." Multiply that across a session and the context window fills with noise, not signal. oo runs commands for you and collapses their output to what the agent actually needs.

Output Tiers

$ oo ls -la
total 48
drwxr-xr-x  8 user user 4096 Mar  2 09:00 .
...

Small output (≤ 4 KB) passes through verbatim — no wrapping, no prefix.

$ oo pytest tests/
✓ pytest (47 passed, 3.2s)

Large output with a known success pattern collapses to a single summary line.

$ oo pytest tests/
✗ pytest

FAILED tests/test_api.py::test_login - AssertionError: expected 200, got 401
...
[last 30 lines of output]

Failure output is filtered to the actionable tail (or custom strategy per tool).

$ oo gh issue list
● gh (indexed 47.2 KiB → use `oo recall` to query)

Large unrecognised output is indexed locally; query it with oo recall.

Installation

Pre-built binaries (recommended)

Download from GitHub Releases:

# macOS (Apple Silicon)
curl -LO https://github.com/randomm/oo/releases/latest/download/double-o-aarch64-apple-darwin.tar.xz
tar xf double-o-aarch64-apple-darwin.tar.xz
sudo mv oo /usr/local/bin/

# Linux (x86_64)
curl -LO https://github.com/randomm/oo/releases/latest/download/double-o-x86_64-unknown-linux-gnu.tar.xz
tar xf double-o-x86_64-unknown-linux-gnu.tar.xz
sudo mv oo /usr/local/bin/

# Linux (ARM64)
curl -LO https://github.com/randomm/oo/releases/latest/download/double-o-aarch64-unknown-linux-gnu.tar.xz
tar xf double-o-aarch64-unknown-linux-gnu.tar.xz
sudo mv oo /usr/local/bin/

From crates.io

cargo install double-o

From source

git clone https://github.com/randomm/oo.git
cd oo
cargo build --release
cp target/release/oo /usr/local/bin/

Commands

Command	Description
`oo <cmd> [args...]`	Run a shell command with context-efficient output
`oo recall <query>`	Search indexed output from this session
`oo forget`	Clear all indexed output for this session
`oo learn <cmd> [args...]`	Run command and teach `oo` a new output pattern via LLM
`oo help <cmd>`	Fetch a cheat sheet for `cmd` from cheat.sh
`oo init`	Generate `.claude/hooks.json` and print AGENTS.md snippet
`oo version`	Print version

Note: oo help sources from cheat.sh which covers common Unix tools. For modern CLIs not yet in cheat.sh (e.g., gh, kamal), use oo learn <cmd> to teach oo the command's output patterns.

Agent Integration

Add this to your system prompt or CLAUDE.md:

Prefix all shell commands with `oo`. Use `oo recall "<query>"` to search large outputs.

That's it. The agent runs oo cargo test, gets ✓ cargo test (53 passed, 1.4s), and moves on.

Built-in Patterns

oo ships with 10 patterns that match commands automatically:

Command	Success	Failure strategy
`pytest`	`{passed} passed, {time}s`	tail 30 lines
`cargo test`	`{passed} passed, {time}s`	tail 40 lines
`go test`	`ok ({time}s)`	tail 30 lines
`jest` / `vitest`	`{passed} passed, {time}s`	tail 30 lines
`ruff check`	quiet (no output on pass)	smart truncate
`eslint`	quiet	smart truncate
`cargo build`	quiet	head 20 lines
`go build`	quiet	head 20 lines
`tsc`	quiet	head 20 lines
`cargo clippy`	quiet	smart truncate

Add your own patterns with oo learn <cmd> (generates a TOML pattern file via LLM) or write one manually in ~/.local/share/oo/patterns/.

License

Apache-2.0 — see LICENSE.

oo help fetches content from cheat.sh, which includes tldr-pages content (CC BY 4.0). See NOTICE.

Installing the oo executable

Adding double_o library as a dependency

Installing the `oo` executable

Adding `double_o` library as a dependency