Comparison Base

by microsoft

Comparison Base is a DevOps skill for Claude Code, published by microsoft in FluidFramework.

4.9K stars585 forkson microsoft/FluidFrameworkAdded 2026/08/12Repository updated 2026/08/12

View source on GitHub Download repo ZIP

collaborationcrdtdatastructuredistributedfluidfluid-frameworkmicrosoftrealtime

Install in seconds

Install Comparison Base

Copy Comparison Base into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/microsoft/FluidFramework/tree/main/.claude/skills/comparison-base ~/.claude/skills/comparison-base

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/microsoft/FluidFramework.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: .claude/skills/comparison-base/SKILL.md in microsoft/FluidFramework
Installs to: ~/.claude/skills/comparison-base
Collection: One of 31 skills cataloged from this repository
Category: DevOps — 798 skills

What Comparison Base does

Comparison Base resolves the correct merge-base for a review branch against its target branch. Use it to identify the commit and remote needed for PR comparisons and change analysis.

Comparison Base is cataloged under DevOps on DirSkills. Comparison Base comes from a repository tagged collaboration, crdt, datastructure, distributed and fluid.

Documentation

README

Excerpt

Comparison Base Resolution

Use this skill when another workflow needs to compare a branch or working tree with the branch it is intended to merge into. This skill resolves the comparison refs and commit; the caller decides what paths and endpoint to diff.

Inputs

$REVIEW_REF: the commit being reviewed. Default to HEAD.

Set $IS_LOCAL_REVIEW=true when the input is HEAD, or when a named local branch is the currently checked-out branch; otherwise set it to false. Callers use this explicit value to decide whether workspace changes belong to the review.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Comparison Base

What else does microsoft publish alongside Comparison Base?
Comparison Base is one of 31 skills that DirSkills catalogs from microsoft/FluidFramework, the repository it ships in. Its siblings there include API Changes Review, Brainstorming and Building UI/UX. Each one is a separate skill with its own page in this directory, installs the same way Comparison Base does, and is maintained by microsoft in that same repository. The rest of the collection is listed on the microsoft/FluidFramework page.
How does Comparison Base compare to other DevOps skills?
Comparison Base ranks #158 by stars among the 798 DevOps skills in this catalog. The most-starred ones next to it are Backend Patterns, API Connector Builder and Migration. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Comparison Base against them. Open each page to compare what they document and how they install.