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Run a seam check on the tile before you repeat it. A check costs nothing, answers in the same call, and tells you whether the copies of the tile meet cleanly. Do it before the render, because a seam is cheap to fix in the file and expensive to find on a product photo a buyer has already seen.

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Why one line becomes many

A pattern is one tile placed again and again, edge to edge. If the right edge of the tile does not run on into its left edge, the break shows at every join. On a mug that is a few lines; on a duvet cover or a wallpaper sample it is a grid across the whole surface. Most of these tiles look fine on their own, which is why the problem tends to be found on the finished mockup rather than in the design file. A check only matters when the copies touch, so it applies to a pattern with no gap between tiles. With tile_spacing above 0, each copy stands on its own and there is no join to check.

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From the API

Send the tile to Check seams as a URL or as base64. If the render will use fit set to crop, add crop_aspect, the tile’s width divided by its height, so the check looks at the same cut the render makes.
cURL
Read data.status:
  • seamless: render as it is.
  • faint_seam: a slight line. Fine for most products; fix it for a print seen up close.
  • visible_seam: a line most people will notice. Fix it before you render.

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From an agent

An agent connected over MCP has the same two steps as tools: check_seams, which is free, and fix_seams, which spends credits. A good agent checks every pattern before it renders one, and asks you before it starts a fix. Connect an agent covers the connection.

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When the answer is a seam

Fix seams repairs the tile as a job and gives you a new file to render with. Its credits come back if the fix fails, and a tile you have already fixed is returned by the next check rather than charged again. A tile with transparent edges cannot be fixed; fill the edges in the design file first. Check and fix pattern seams walks through the whole flow, the job and the webhook.

Check and fix pattern seams

The check, the fix, the job and the webhook in one place.