Review a specific diff (branch, commit, or GitHub PR) and show the findings as comments inside difit, the local diff viewer. Explicit opt-in only — use when the user explicitly names difit, asks to open or annotate the review in the difit viewer, or invokes this skill by name. For ordinary requests

Difit Review When to Use This Skill difit opens an external browser UI and starts a long running local server, so launching it must be explicit opt in: Use this skill only when the user explicitly names difit, asks to open, show, or annotate the review in the difit viewer, or invokes this skill by name. Do NOT use it for ordinary review requests such as "review these changes", "use the reviewer agent", "find problems in this diff", or "review this PR/commit/branch". Perform those reviews normally and report the findings in your response. When a request is ambiguous, prefer the non difit review path. Overview This skill launches a requested git diff in a viewer that is easy for humans to read. At the same time, the agent can attach arbitrary comments via the comment option. This comment mechanism is well suited for code review findings and code explanations. Before running commands, choose <difit command using the following rule: If command v difit succeeds, use difit . Otherwise, use npx difit . If falling back to npx difit would require network access in a sandboxed environment without network permission, request escalated permissions and user approval before running it. Steps The final command typically looks like this: The detailed procedure is as follows. 1. Identify the target diff and review its contents. Inspect the diff specified by the user. This may be a local git revision, a GitHub URL, a patch file, or something similar. Understand the diff normally, inspect surrounding code when needed, and think through the response required by the user's request, whether that is review findings, explanations, or something else. For PR reviews, inspect the PR locally and keep the review result limited to difit output. Do not post comments back to remote GitHub. 2. Attach the prepared comments and launch difit — or reuse a running server. Reuse before launch Keep at most one live difit server per Git root and review target. If a difit server you started earlier is still running for the same target, do not launch another or reopen its URL; add the new findings to it with <difit command comment add port <port '<json ' (same JSON shape as comment ) and let the open page pick them up. If review rounds are expected to repeat, launch with keep alive or background (a detached keep alive server that prints JSON connection info such as {"port":4966,"url":"http://localhost:4966","pid":123} without auto opening a browser), then use comment add / comment get port <port for later rounds. difit launch options Use <difit command <target [compare with] to specify the target diff. For uncommitted changes use <difit command . , for working tree changes use <difit command working , and for staged changes use <difit command staged . For stdin input, use a form such as diff u file1.txt file2.txt <difit command . Comment arguments Use type: "thread" for each comment. Write comment bodies in the language the user is using. Use position.side: "new" for lines that exist on the target side of the diff. Use position.side: "old" for lines that exist only on the deleted side. Use range comments for issues that span multiple lines. Never copy secrets, tokens, passwords, API keys, private keys, or other credential like material from the diff into comment bodies or any command line arguments. Additional argument for files not yet added to git For uncommitted changes, if you decide files not yet added to git should also appear in the diff, add include untracked . 3. Share the difit URL and finish the response. If there were no comments to attach, explicitly say so. No manual verification of the launched difit page is required.

difit-review