szr

szr is short for "sizer". It is a Go-native CLI proxy that trims command output before it reaches an LLM, so the model gets the signal without paying for every line of terminal noise.

How it works

flowchart LR
  C["Run: `git diff`"]
  C --> W["LLM<br/>higher tokens"]
  C --> Z["szr<br/>filter output"]
  Z --> L["LLM<br/>lower tokens"]

  classDef base fill:#F3F4F6,stroke:#9CA3AF,color:#374151;
  classDef blue fill:#31A9F3,stroke:#31A9F3,color:#ffffff;
  class C,W base;
  class Z,L blue;
  linkStyle 0 stroke:#9CA3AF,stroke-width:2px;
  linkStyle 1,2 stroke:#31A9F3,stroke-width:2px;

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Install

There are now two separate install layers:

• global install: make the szr binary available on your shell PATH
• repo bootstrap: teach a specific repo and agent environment to prefer szr

Global install

From a local checkout, install the binary into your Go bin directory:

go install ./cmd/szr
szr self doctor

Or build locally and let szr install itself into ~/.local/bin or ~/bin:

make build
./bin/szr self install
./bin/szr self doctor

If your shell does not already include that install directory on PATH, szr self install prints the exact line to add to ~/.zshrc, ~/.bashrc, or the detected shell rc file. To let szr append that line for you:

./bin/szr self install --update-shell

Homebrew is also wired up through this repo's tap:

# From a local checkout
brew tap devr-tools/szr "$(pwd)"
brew install szr
szr self doctor

# From GitHub
brew tap devr-tools/szr
brew install szr
szr self doctor

# One-line direct install from the tap
brew install devr-tools/szr/szr
szr self doctor

# Latest main branch instead of the stable tag
brew install --HEAD devr-tools/szr/szr
szr self doctor

The first stable formula release is v0.1.0. Future tagged releases are documented in docs/RELEASING.md.

Repo bootstrap

Once the binary is globally available, bootstrap repo-local guidance separately:

szr install codex
szr install shell

That keeps global binary installation separate from repo-specific agent/editor wiring.

Usage

# Install szr
go install ./cmd/szr
szr self doctor

# Bootstrap this repo for agent/shell use
szr install codex
szr install shell

# Run your usual commands through szr
szr git status
szr git diff
szr go test ./...

# Check token savings and command history
szr spread
szr spread --history

# Useful follow-ups
szr tee --latest
szr explain go test ./...
szr commands

Local Development

The test suite now lives under test/, with coverage enforced against ./internal/.... The public Go package lives under pkg/szr, while cmd/szr-dev is the developer-only launcher path.

make test
make cover
make smoke
make prepush

Contributing

Public contributions are welcome. Start with CONTRIBUTING.md for local setup, test expectations, commit hygiene, and PR etiquette.

For most code changes, the minimum bar is:

• keep the scope tight
• add or update tests with the behavior change
• run make fmt and make test
• explain the user-facing impact and verification steps in the PR