diff-scope

name	diff-scope
description	Determine which git diff to analyze based on the user's request. Supports current diff, most recent commit, or current branch.
cc:user-invocable	false
cc:allowed-tools	Bash(git diff:*), Bash(git merge-base:*), Bash(git rev-parse:*)

Diff Scope

Determine which git diff to analyze based on the user's request.

Current diff (default)

Use when the user mentions "current changes", "my diff", "uncommitted changes", or does not specify a scope.

git diff HEAD

This combines both staged and unstaged changes against HEAD.

Most recent commit

Use when the user mentions "last commit", "most recent commit", or "previous commit".

git diff HEAD~1..HEAD

All commits on the current branch

Use when the user mentions "branch changes", "all commits", "changes since main", or "this branch".

First, detect the default branch:

git rev-parse --verify main 2>/dev/null && echo main || echo master

Then diff against it using the merge-base:

git diff $(git merge-base <default-branch> HEAD)..HEAD

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If the selected diff is empty, STOP and tell the user there are no changes to analyze.