Diffsmith - Comment on your AI agent's code & collaborate on changes
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Diffsmith is a code review studio for local git changes made by Claude Code, Cursor, Codex, Copilot, or any other AI coding agent.
Open a repo, read the uncommitted diff, and click any line to leave a comment anchored to that exact spot. Then hand your notes straight back to the agent.
Supports MCP for viewing you're agent's replies to your comments directly at the line of code it relates to.
Diffsmith is 100% offline and a one time purchase unlocks lifetime access.
Replies
One thing I'd love to see is a way to group related comments into threads so I can have a back and forth on the same block of code without the chat getting messy.
Love how cleanly it anchors comments right to the diff line, makes giving feedback to the agent way less painful. The offline approach is a nice touch too.
The line-anchor model nails what the agent wrote, but reviewing Claude Code and Codex diffs my highest-leverage notes are almost always about what it didn't write: 'you skipped the error path here', 'no test for the empty input'. There's no changed line to click on for those. How do you attach a comment to an omission, or to a file the agent should have touched but left alone? That's where a lot of my review time actually goes.
honestly this looks really useful for reviewing ai-generated code, the per-line commenting with mcp replies is a clever touch. one thing that would help me a lot is a way to filter the diff to only show files changed by the agent versus my own edits, so i can focus the review where it matters most. sort of a split view toggle.
A diff view that groups related changed lines into collapsible logical blocks (function, class, block) would be huge when reviewing large AI-generated changes, instead of scrolling through every single line individually. Would love to see something like that next.
Would love to see a way to group comments into review rounds so I can do a first pass, send notes to the agent, then do a follow-up review on just the changed lines from the next commit without losing my original feedback.
A diff view that groups changes by file with a quick-jump sidebar would save a lot of scrolling on larger branches, especially when I'm bouncing between several modified files at once.
Would love to see a way to filter or group comments by the agent that generated the diff. When I'm reviewing changes from both Claude Code and Cursor in the same session, it gets hard to track which feedback needs to go back to which tool. A simple dropdown to view only comments for a specific agent's changes would save me a lot of mental overhead.
Finally a clean way to review what my AI agent just churned out without scrolling through terminal output. Clicking a line to leave a note and bouncing it back through MCP feels exactly like the workflow I didn't know I needed.
One thing I'd love to see is a keyboard shortcut to jump between comments during review, something like cmd+] and cmd+[ to cycle through them. Right now clicking around to find each note breaks my flow when I'm going through a big diff.