LUCI

Spec sheet

Purpose

LUCI stands for Layered “Universal” Continuous Integration and is a fleet of complementary, independent, scalable services for CI needs ranging from small to huge.Read 11 Oct 2026 · luci.github.io

Integrations

Buildbucket has native integration with Swarming and recipes, allowing builds to be scheduled on Swarming to run a configured recipe.Read 11 Oct 2026 · chromium.googlesource.com

License

The luci-py project is licensed under Apache v2.0.Read 5 Oct 2026 · chromium.googlesource.com

Access controls

LUCI configuration supports role based access controls for permissions such as reading project configurations, logs, and build information.Read 11 Oct 2026 · chromium.googlesource.com

Build foundation

LUCI is designed to provide a robust foundation for distributed computation on which teams can layer their own build scripts.Read 11 Oct 2026 · luci.github.io

Build scheduling

Buildbucket tracks builds, queues them into builders, and can translate a scheduled build into a Swarming task.Read 11 Oct 2026 · chromium.googlesource.com

Build UI

Milo displays information from Buildbucket and ResultDB about builders, builds, and test results, and can show custom consoles.Read 11 Oct 2026 · chromium.googlesource.com

Configuration

LUCI service configuration can specify access controls, Swarming dimensions, recipe names, and properties for builders.Read 11 Oct 2026 · chromium.googlesource.com

Design

LUCI is a fleet of complementary, independent, scalable services designed to provide distributed computation for build scripts.Read 5 Oct 2026 · luci.github.io

Distributed execution

Swarming runs arbitrary tasks across a fleet of workers called Swarming bots.Read 11 Oct 2026 · chromium.googlesource.com

File distribution

Isolate server distributes tens of thousands of files per task.Read 5 Oct 2026 · chromium.googlesource.com

Hosting

LUCI runs primarily on Google Cloud Platform and is designed to scale for large projects.Read 5 Oct 2026 · chromium.googlesource.com

Infrastructure

The toolkit includes automatic Google Compute Engine virtual machine recycling.Read 5 Oct 2026 · chromium.googlesource.com

Operating systems

The documentation lists Windows, OSX, and Linux (Ubuntu), with Android, iOS, and ChromeOS use.Read 5 Oct 2026 · chromium.googlesource.com

Recipe framework

LUCI Recipes are a Python 3 framework for CI scripts designed to be testable, cross-platform, shareable, locally runnable, and integrated with the LUCI UI.Read 5 Oct 2026 · chromium.googlesource.com

Scale

The LUCI overview describes Swarming as distributing tasks across thousands of bots and Isolate server as distributing tens of thousands of files per task.Read 11 Oct 2026 · chromium.hanana2.link

Supported environments

The LUCI overview lists Windows, OSX, and Linux (Ubuntu) environments used with Android, iOS, and ChromeOS.Read 11 Oct 2026 · chromium.hanana2.link

Task distribution

Swarming distributes tasks across thousands of Swarming bots.Read 5 Oct 2026 · chromium.googlesource.com

Test results

Milo displays test result information from ResultDB alongside builder and build information.Read 11 Oct 2026 · chromium.googlesource.com

UI integration

Recipes can display subprocesses as steps, with step colors, descriptive text, and debugging logs in the LUCI UI.Read 5 Oct 2026 · chromium.googlesource.com

Use

LUCI is used by the Chromium project.Read 5 Oct 2026 · chromium.googlesource.com

Users

LUCI is used by the Chromium project and other teams, according to the LUCI repository overview.Read 11 Oct 2026 · chromium.hanana2.link

Where Specifiction places it

• Continuous Integration Software#42 of 587.4