v0.4.6

googleapis/mcp-toolboxv0.4.6Jul 1, 2026by github-actions[bot]

AI Summary

A release focused on enhancements, performance optimizations, and documentation updates for the prek toolchain, including refactoring environment variable handling.

Key Highlights

Verify managed toolchain downloads before installation
Add `PREK_DOCKER_NO_INIT` to opt-out Docker `--init`
Improve subprocess error messages
Split run concurrency knobs into `PREK_CONCURRENT_HOOKS` and `PREK_CONCURRENT_BATCHES`

New Features

Verify managed toolchain downloads
Add `PREK_DOCKER_NO_INIT` to opt-out Docker `--init`
Improve subprocess error messages
Split run concurrency knobs
Avoid allocating markdown extensions per file
Avoid unchanged config tracking writes
Delay trailing whitespace output buffer
Prefilter VCS permalink lines
Skip unnecessary submodule updates during hook repo clone
Document `language_version` inferring
Refactor env var handling
Use `serde-saphyr` for YAML string quoting

Full Release Notes

## Release Notes

Released on 2026-07-01.

### Enhancements

- Verify managed toolchain downloads before installation ([#2229](https://github.com/j178/prek/pull/2229))
- Add `PREK_DOCKER_NO_INIT` to opt-out Docker `--init` ([#2242](https://github.com/j178/prek/pull/2242))
- Improve subprocess error messages ([#2257](https://github.com/j178/prek/pull/2257))
- Split run concurrency knobs: `PREK_CONCURRENT_HOOKS` and `PREK_CONCURRENT_BATCHES` ([#2276](https://github.com/j178/prek/pull/2276))

### Performance

- Avoid allocating markdown extensions per file ([#2245](https://github.com/j178/prek/pull/2245))
- Avoid unchanged config tracking writes ([#2247](https://github.com/j178/prek/pull/2247))
- Delay trailing whitespace output buffer ([#2244](https://github.com/j178/prek/pull/2244))
- Prefilter VCS permalink lines ([#2253](https://github.com/j178/prek/pull/2253))
- Skip unnecessary submodule updates during hook repo clone ([#2255](https://github.com/j178/prek/pull/2255))

### Documentation

- Document `language_version` inferring for Python and Go ([#2241](https://github.com/j178/prek/pull/2241))

### Other changes

- Refactor env var handling ([#2277](https://github.com/j178/prek/pull/2277))
- Use `serde-saphyr` for YAML string quoting ([#2228](https://github.com/j178/prek/pull/2228))

### Contributors

- @shaanmajid
- @j178

## Install prek 0.4.6

### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://github.com/j178/prek/releases/download/v0.4.6/prek-installer.sh | sh
```

### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://github.com/j178/prek/releases/download/v0.4.6/prek-installer.ps1 | iex"
```

### Install prebuilt binaries via Homebrew

```sh
brew install prek
```

## Download prek 0.4.6

|  File  | Platform | Checksum |
|--------|----------|----------|
| [prek-aarch64-apple-darwin.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-apple-darwin.tar.gz.sha256) |
| [prek-x86_64-apple-darwin.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-apple-darwin.tar.gz.sha256) |
| [prek-aarch64-pc-windows-msvc.zip](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-pc-windows-msvc.zip.sha256) |
| [prek-i686-pc-windows-msvc.zip](https://github.com/j178/prek/releases/download/v0.4.6/prek-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-i686-pc-windows-msvc.zip.sha256) |
| [prek-x86_64-pc-windows-msvc.zip](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-pc-windows-msvc.zip.sha256) |
| [prek-aarch64-unknown-linux-gnu.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-unknown-linux-gnu.tar.gz.sha256) |
| [prek-i686-unknown-linux-gnu.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-i686-unknown-linux-gnu.tar.gz.sha256) |
| [prek-riscv64gc-unknown-linux-gnu.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-riscv64gc-unknown-linux-gnu.tar.gz.sha256) |
| [prek-s390x-unknown-linux-gnu.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-s390x-unknown-linux-gnu.tar.gz.sha256) |
| [prek-x86_64-unknown-linux-gnu.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-unknown-linux-gnu.tar.gz.sha256) |
| [prek-armv7-unknown-linux-gnueabihf.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-armv7-unknown-linux-gnueabihf.tar.gz.sha256) |
| [prek-aarch64-unknown-linux-musl.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-aarch64-unknown-linux-musl.tar.gz.sha256) |
| [prek-i686-unknown-linux-musl.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-i686-unknown-linux-musl.tar.gz.sha256) |
| [prek-x86_64-unknown-linux-musl.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-x86_64-unknown-linux-musl.tar.gz.sha256) |
| [prek-arm-unknown-linux-musleabihf.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-arm-unknown-linux-musleabihf.tar.gz.sha256) |
| [prek-armv7-unknown-linux-musleabihf.tar.gz](https://github.com/j178/prek/releases/download/v0.4.6/prek-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://github.com/j178/prek/releases/download/v0.4.6/prek-armv7-unknown-linux-musleabihf.tar.gz.sha256) |

## Verifying GitHub Artifact Attestations

The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the [GitHub CLI](https://cli.github.com/manual/gh_attestation_verify):
```sh
gh attestation verify <file-path of downloaded artifact> --repo j178/prek
```

You can also download the attestation from [GitHub](https://github.com/j178/prek/attestations) and verify against that directly:
```sh
gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>
```