Leave a review comment on one of a build's changed-story diffs (resolve the build by commitSha/prNumber/buildId, target the diff by diffResultId from get_build/get_diff). The comment is authored as the agent. Optionally anchor it to a spot on the candidate image with `anchor`: omit or null for a whole-diff comment, {type:'point',x,y} to pin a point, {type:'rect',x,y,w,h} for a box, or {type:'path',points:[{x,y},...],closed} for a shape - all coordinates 0..1 normalized to the candidate image. `side` picks the pane ('after' the candidate, default; 'before' the baseline). Pass `parentId` (a root comment id from list_comments) to REPLY in that thread instead - a reply inherits the root's side and carries no anchor, so `anchor`/`side` are ignored. A new root comment is refused when a newer build exists on the branch (comment on the latest build); replies stay allowed. Reference: https://uiverify.ai/docs/mcp-tools
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