# microsoft/BuildXL

Microsoft Build Accelerator

Repository: https://github.com/microsoft/BuildXL
Canonical: https://ross.abutalabs.com/products/buildxl
Language: C#
License: MIT
License Family: permissive
Topics: macos, filesystem, unix, cli, sandbox, kernel, orchestration, xcode, coreclr, netstandard, xplat
Last push: 2026-09-03T00:51:50+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 35, longevity 100
- inputs: {"age_days": 2882, "days_push": 0, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1018, forks 167 (observed 2026-09-03T02:15:14.975522+00:00)

## What it is
BuildXL is Microsoft's high-scale build engine that accelerates large monorepo builds through distributed execution and massive caching of sources and outputs. It supports JavaScript, MSBuild, Ninja/CMake, and its own DScript build language via a command-line interface.

## Use cases
- speed up builds of huge monorepo codebases
- distribute build work across many machines
- cache build outputs to avoid redundant compilation
- accelerate JavaScript, MSBuild, or CMake/Ninja builds
- sandbox build process executions for correctness

## When to choose
- you build very large monorepos where build time is a bottleneck
- you need distributed builds and petabyte-scale caching
- your team already uses or can adopt DScript or supported frontends

## When to avoid
- you want a simple small-project build tool
- you need Visual Studio IDE integration
- you expect a drop-in MSBuild replacement

## Facets
- artifact type: cli-tool
- maturity: active
- function: build-tool, caching, cli, scheduling
- domain: developer-tools
- platform: windows, cli
- tags: build-engine, build-acceleration, distributed-builds, monorepo, sandboxing, dscript, msbuild, javascript, ninja, devops, command-line, linux, macos

## Member repositories
- microsoft/BuildXL (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-09-03T02:15:14.975522+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:11:14.331343+00:00, confidence not recorded.
  - readme: https://github.com/microsoft/BuildXL (fetched 2026-09-03T02:15:14.975522+00:00, sha bb0b2dfb02dc)
- Data as of 2026-08-30T08:39:29.467469+00:00.