Review Agent Resolved

Close the loop between review and fix.

Sift is a native macOS diff viewer with a built-in MCP server. Leave a comment on a line — Claude Code, Codex, or any MCP agent picks it up, ships the fix, and marks it resolved.

View on GitHub Connect your agent

Sift showing a GitHub-style split diff of uncommitted changes, with a review comment on a line and the branch switcher in the toolbar

Your agent writes the code. You still hand-deliver the feedback.

Agents generate more code than ever, which makes review the real bottleneck — and today it’s a dead end. You read the diff in one window, find the problem, then copy the file path, the line, and your reasoning into a prompt like it’s 2023. Every finding you make should reach the agent that can act on it, automatically. That’s the loop Sift closes.

42+const total = items.reduce((a, b) => a + b.qty)

You Missing initial value — this throws on an empty cart.

The copy-paste gap

Comment in Sift. Your agent does the rest.

Sift runs a local MCP server alongside the diff viewer. Comments you leave on the diff become work items your running agent fetches directly — it fixes the code, marks each comment resolved, and Sift’s diff refreshes the moment the change lands. Connect once and it stays connected.

Exposed tools

list_review_comments resolve_comment reopen_comment get_review_context

Run once in any terminal:

claude mcp add --transport http sift http://127.0.0.1:4966/mcp

Add to ~/.codex/config.toml:

[mcp_servers.sift]
url = "http://127.0.0.1:4966/mcp"

A diff viewer built for the pre-commit moment.

Uncommitted by default

Opens straight to your working tree vs HEAD, with an Include Untracked toggle for brand-new files.

Split, unified, word-level

GitHub-style Files Changed view with side-by-side or unified layout and word-level intra-line highlighting.

Rendered previews

Markdown and HTML render as previews by default (HTML sandboxed), plus images, notebooks, and Mermaid diagrams.

Real branch switching

See your current branch and switch with an actual git checkout, guarded against a dirty tree.

Live-reloading diff

Commit, stage, or edit — even from your agent’s terminal — and the diff refreshes itself instantly.

Native, not Electron

A real macOS .app on Tauri: Rust backend, system WebView, light and dark, fast everywhere.

Free, open, on your machine.

Clone the repo and build from source today — a signed .dmg is on the way. MIT-licensed, built on difit by yoshiko-pg.

github.com/AltSlate-Labs/sift

MIT licensed Works with Claude Code & Codex Native macOS