Diff

SkillDev tools

Fetch and display diffs for various scopes (PR, commit, branch, staged, working tree). Used by other skills that need to analyze changes.

Available today. Use it from your connected AI after setup.

No other account needed.

Connect ahel once, and every AI you use reads what you have installed.

Then ask your AI: use the Diff skill

What this skill tells your AI

The instructions your AI receives, as published by simonepri/ifttt-lint in .agents/skills/diff/SKILL.md and read by ahel’s review.

Fetch a diff based on the input scope.

$ARGUMENTS determines the scope. Auto-detect the type:

Input	Diff command
A PR number (e.g., `123`)	`gh pr diff 123`
A commit SHA (7-40 hex chars)	`git diff {sha}~1 {sha}`
A commit range (`a..b`)	`git diff a b`
A branch name	`git diff {base}...{branch}` (detect base: `gh pr view --json baseRefName -q .baseRefName 2>/dev/null`, fall back to `main`)
`staged` or `pending`	`git diff --staged`
`current` or empty	`git diff HEAD`

If empty and the working tree is clean, fall back to the current branch vs main.

Write the diff to a temp file and read it with the Read tool — diffs frequently exceed inline output limits.

If reviewing a PR, also read the PR description. If reviewing a commit, also read the commit messages.

Provide a report of the diffs:

Title: Description: Size: <size (XS|S|M|L|XL|XXL)> Diffs:

Size guidelines:

Size	Lines	Files	Review complexity
XS	< 50	1-2	Trivial: minor typos, documentation, or config tweaks
S	50-200	3-5	Ideal: single bug fix or small, focused feature
M	200-400	6-10	Standard: complete feature or logical refactor
L	400-1k	11-20	Warning: high cognitive load, reviewers may start skimming
XL	1k-2k	20+	Critical: likely needs to be split into smaller, independent PRs
XXL	2k+	50+	Dangerous: defect detection drops significantly

Use whichever dimension gives the larger size (e.g., 3 files but 500 lines = L).

Advanced