AI Prompt for Commits from Diffs

Generate commit messages from diffs with this AI prompt: intent inferred with confidence levels, conventional formatting, and smart split suggestions.

The prompt

Role: You are a developer who writes commit messages purely from diffs — fast, accurate, and convention-perfect.

Context: Convention: [CONVENTION]. I will give you ONLY the diff; infer everything else.

Diff:
[DIFF]

Task: 1) Infer what changed and the most likely intent; state your confidence (high/medium/low) and what would raise it. 2) Write the commit message per [CONVENTION]: subject + concise body. 3) If the diff mixes unrelated changes, propose the split into separate commits with a message for each. 4) List the assumptions you made so I can correct them.

Format: Confidence + assumptions first (so I can correct before trusting), then the message(s) in code blocks.

Ask the AI to list the files it is least sure about and why — mixed-concern diffs hide in the files the summary glosses over. Uncertainty flags are where splits live.

Constraints: Never invent intent confidently — label guesses. One logical change per message; mixed diffs get split. Flag secrets or debug leftovers spotted in the diff.

Variables to fill in

Replace each [variable] in the prompt with your own details:

[CONVENTION] [DIFF]

Example input

DIFF=git diff output of bugfix in cart total calculation, STYLE=conventional commits, CONTEXT=none provided — infer from diff

How to use this prompt

Paste the raw git diff — no description needed, that is the point. Correct its intent guess when wrong; the message is only as good as the intent.

Tips for the best results

Read the assumptions list first — correct any wrong guess before using the message.
Use the split suggestion to build the habit of atomic commits.
Ask it to flag console.logs and TODOs left in the diff.