{
  "slug": "agent-browser-adds-page-state-diff-commands-a4da64654ed1",
  "title": "agent-browser adds page-state diff commands",
  "tools": [
    "agent-browser"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-02-20T06:17:37.000Z",
  "announced_at": "2026-02-20T06:17:37.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When reviewing web UI changes, compare page states with `agent-browser diff snapshot`, `diff screenshot --baseline <file>`, or `diff url <url1> <url2>`. Add selectors and depth for scoped accessibility diffs, or `--screenshot` to include visual comparison for two URLs.",
    "examples": [
      "agent-browser diff snapshot --selector \"<css-selector>\" --depth <n>",
      "agent-browser diff screenshot --baseline <baseline-image> --selector \"<css-selector>\"",
      "agent-browser diff url <url1> <url2> --screenshot --wait-until <load|domcontentloaded|networkidle>"
    ],
    "gotchas": [
      "Version: v0.13.0",
      "--baseline <file> (required): Saved snapshot or baseline image to compare against for snapshot or screenshot diff; required for screenshot diff. Snapshot diff can omit it to use the last session snapshot.",
      "--selector <sel>: Scope snapshot diff to a CSS selector or @ref; screenshot diff to an element.",
      "--compact: Use compact snapshot format.",
      "--depth <n>: Limit snapshot tree depth.",
      "--output <file>: Path for generated screenshot diff image; defaults to temporary directory.",
      "--threshold <0-1>: Screenshot color-distance threshold; default 0.1, higher is more tolerant.",
      "--full: Use full-page screenshots.",
      "--screenshot: For URL diff, also perform visual screenshot comparison.",
      "--wait-until <strategy>: URL navigation wait strategy: `load` (default), `domcontentloaded`, or `networkidle`.",
      "Prerequisite: Install agent-browser and download Chromium: `npm install -g agent-browser` then `agent-browser install`.",
      "Accessibility tree snapshot comparisons support customizable depth and selectors.",
      "URL comparisons can optionally include screenshot comparison."
    ]
  },
  "why_it_matters": "Compare two page states while reviewing a repository's web UI changes.",
  "sources": [
    "https://github.com/vercel-labs/agent-browser/releases/tag/v0.13.0",
    "https://github.com/vercel-labs/agent-browser/blob/v0.13.0/docs/src/app/diffing/page.mdx",
    "https://github.com/vercel-labs/agent-browser/blob/v0.13.0/README.md"
  ],
  "rank": 0.95043,
  "judge": {
    "publish": true,
    "judge_model": "codex-cli/gpt-6-luna+typesafe/jev-1.13.0",
    "prompt_version": "extract-v7+enrich-v2+judge-v2x3+jev-publish-v1"
  },
  "review_state": "approved",
  "provenance": {
    "run_id": "wave2a-20261017",
    "verdict_id": "wave2a-20261017:wave2a-20261017-369e78a4bc14b426-0:gate",
    "evidence_hash": "b64bc7ebe5ac6c5da9ad1bb4c8954f6f4d7ecfc1db5964653efadb276cbe46e3"
  },
  "review": {
    "draft_hash": "f28efafcc8f7d80643e30cad7f3d8b57e63c06d6165ad097a9746e0b0bc60eb5",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "wave2a-20261017:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.95 >= 0.9; 2 needed) and Jev gave 0.62 (>= 0.6 needed)."
  }
}