Mark up screens for agents.

Markloom is a static visual review board for comparing mockups, goldens, screenshots, and references. Give an agent this URL and it can read the instructions, import images, and hand the board back for precise visual feedback.

Open board Read this first, agents Payload example

Agents should re-read the guide after updates.

Visual Review Board

Mock

Golden

Copy

Agent handoff

1. Read Agents should open /agent-guide.md before using the board. The guide is the current source of truth.

2. Import Use /board/#data=<base64url(JSON)> with page title, section title, image URLs, and image labels.

3. Mark Add arrows, boxes, pen strokes, text, or pasted references on the board, then use Copy.

Minimal payload

{
  "title": "UI Review",
  "storageKey": "ui-review-20260605",
  "pairs": [
    {
      "id": "home",
      "title": "Home Screen",
      "left": "https://example.com/mock.png",
      "right": "https://example.com/golden.png",
      "leftLabel": "Mock",
      "rightLabel": "Golden"
    }
  ]
}