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Agent skill

Browser Screenshot Diff

by ruvnet in ruvnet/ruflo

Visual + DOM diff between two recorded sessions at matching trajectory step ids; used for visual regression and replay verification

MITAuto-check: notesTesting & QA

Install Browser Screenshot Diff

skills CLI
$ npx skills add ruvnet/ruflo --skill browser-screenshot-diff -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install ruvnet/ruflo browser-screenshot-diff --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/ruvnet/ruflo.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/ruflo-browser/skills/browser-screenshot-diff .claude/skills/browser-screenshot-diff && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
browser-screenshot-diff
GitHub stars
74k
Token cost
~623 tokens
SKILL.md length
288 words
Files
1
Skills in repo
264
Repo updated
First seen
Licence
MIT

At a glance

Visual + DOM diff between two recorded sessions at matching trajectory step ids; used for visual regression and replay verification

  • Works in 7 steps: Locate both RVF containers → Load both trajectories from… → Pair steps by step-id. Steps that exist… → …
  • Tasks that involve Visual regression testing
  • SKILL.md covers When to use, Steps and Caveats
  • Calls npx

What it does

Browser Screenshot Diff is an agent skill from ruvnet/ruflo. Visual + DOM diff between two recorded sessions at matching trajectory step ids; used for visual regression and replay verification

Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Visual regression testing. The repository describes itself as: 🌊 The original agent harness. Deploy intelligent multi-player swarms, coordinate autonomous workflows, and build conversational AI systems. Features adaptive memory…. The licence is MIT.

When your agent uses it

  • Tasks that involve Visual regression testing

Example prompts

  • “/browser-screenshot-diff”

Requirements

  • Node.js
  • Pre-approved tools (allowed-tools): mcp__plugin_ruflo-core_ruflo__browser_eval, Bash, Read, Write

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. Locate both RVF containers
  2. Load both trajectories from trajectory.ndjson. Build a step-id → (screenshot_path, snapshot_path) map for each.
  3. Pair steps by step-id. Steps that exist on only one side are flagged as unmatched and contribute to the divergence score.
  4. Pixel diff (--mode pixel|both): compare the two PNGs at each step. Report mse, psnr, and the bounding box of the largest diff cluster…
  5. DOM diff (--mode dom|both): compare the accessibility snapshots node-by-node. Report added / removed / changed nodes with their accessible…
  6. Aggregate similarity: weighted average across matched steps, weighted by step duration. Verdict goes into a new findings.md under a fresh…
  7. Persist the diff verdict in browser-sessions under both source ids' tags so future searches surface "ran a diff against session X".

What it can do on your machine

Read from SKILL.md and the folder at commit de590e1. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • mcp__plugin_ruflo-core_ruflo__browser_eval
    • Bash
    • Read
    • Write

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npx

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Browser Screenshot Diff loads about 623 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 288 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~39
When it runs · the whole SKILL.md, loaded when a task matches
~623

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: mcp__plugin_ruflo-core_ruflo__browser_eval, Bash, Read, Write

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from ruvnet/ruflo at commit de590e1, republished under its MIT licence (© ruvnet). 288 words, ~623 tokens.

Download SKILL.mdSave it as .claude/skills/browser-screenshot-diff/SKILL.md (or your agent's skills folder).
name
browser-screenshot-diff
description
Visual + DOM diff between two recorded sessions at matching trajectory step ids; used for visual regression and replay verification
allowed-tools
mcp__plugin_ruflo-core_ruflo__browser_eval, Bash, Read, Write
argument-hint
<session-id-a> <session-id-b> [--threshold <0..1>] [--mode pixel|dom|both]

Browser Screenshot Diff

Compare two recorded sessions step-by-step. Pairs each step in session A to the same step-id in session B, diffs the captured screenshot and accessibility snapshot, reports the first divergence and an aggregate similarity score.

When to use

  • Visual regression after a UI change (record before, record after, diff).
  • Verifying a browser-replay run matches the parent session within tolerance.
  • Comparing two A/B variants of the same form flow.

Steps

  1. Locate both RVF containers:
    bash
    npx -y ruvector@0.2.25 rvf status <session-id-a>.rvf
npx -y ruvector@0.2.25 rvf status <session-id-b>.rvf
  2. Load both trajectories from trajectory.ndjson. Build a step-id → (screenshot_path, snapshot_path) map for each.
  3. Pair steps by step-id. Steps that exist on only one side are flagged as unmatched and contribute to the divergence score.
  4. Pixel diff (--mode pixel|both): compare the two PNGs at each step. Report mse, psnr, and the bounding box of the largest diff cluster. Threshold default 0.02 (2% of pixels).
  5. DOM diff (--mode dom|both): compare the accessibility snapshots node-by-node. Report added / removed / changed nodes with their accessible names.
  6. Aggregate similarity: weighted average across matched steps, weighted by step duration. Verdict goes into a new findings.md under a fresh RVF container so the diff itself is replayable.
  7. Persist the diff verdict in browser-sessions under both source ids' tags so future searches surface "ran a diff against session X".

Caveats

  • Pixel diff is sensitive to font hinting, antialiasing, and scrollbar position. Keep viewport pinned across both sessions.
  • DOM diff over Playwright's accessibility tree is more stable than HTML diff. Prefer it.
  • This skill does not handle dynamic content (clocks, ads); add ignore regions to the field map or pre-process snapshots before diffing.
  • The browser_screenshot_diff MCP tool is not planned (ADR-0001 §7); the skill operates against locally-saved RVF artifacts and uses browser_eval only for live verification.

© ruvnet, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/ruflo-browser/skills/browser-screenshot-diff of ruvnet/ruflo.

Open the folder on GitHubat commit de590e1

Compare with similar skills

Browser Screenshot Diff next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Browser Screenshot Diff compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Browser Screenshot Diff this skillruvnet/ruflo74k—~623Automated safety check: NotesMIT
Review Local UI Screenshotsxiaocang/easydict_win32101—~1.1kAutomated safety check: PassGPL-3.0
Handsontable Visual Test Demoshandsontable/handsontable22k—~1.3kAutomated safety check: PassCustom licence
Kc Screenshotimran31415/kube-coder388—~870Automated safety check: NotesMIT
Visual QAliangdabiao/Godogen127—~1.4kAutomated safety check: PassMIT
Meticulous FixFlintSH/Flare135—~2.3kAutomated safety check: PassMIT

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    handsontable/handsontable

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    127 GitHub stars~1.4k tokensUpdated 5 mo ago
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Categories

Questions about Browser Screenshot Diff

What does Browser Screenshot Diff do?

Visual + DOM diff between two recorded sessions at matching trajectory step ids; used for visual regression and replay verification. Browser Screenshot Diff is an agent skill from ruvnet/ruflo.

When should I use Browser Screenshot Diff?

Browser Screenshot Diff fits situations like: tasks that involve Visual regression testing.

How do I install Browser Screenshot Diff in Claude Code?

Run `npx skills add ruvnet/ruflo --skill browser-screenshot-diff -a claude-code`. Or copy the skill folder (plugins/ruflo-browser/skills/browser-screenshot-diff in ruvnet/ruflo) into .claude/skills/browser-screenshot-diff in your project. Claude Code loads it when a task matches its description.

How do I install Browser Screenshot Diff in Codex?

Run `npx skills add ruvnet/ruflo --skill browser-screenshot-diff -a codex`. Or copy the skill folder (plugins/ruflo-browser/skills/browser-screenshot-diff in ruvnet/ruflo) into .agents/skills/browser-screenshot-diff in your project. Codex loads it when a task matches its description.

Can I use Browser Screenshot Diff in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ruvnet/ruflo --skill browser-screenshot-diff -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/browser-screenshot-diff, .gemini/skills/browser-screenshot-diff, .github/skills/browser-screenshot-diff and .opencode/skills/browser-screenshot-diff in your project.

What does Browser Screenshot Diff need to run?

Going by SKILL.md and its folder, Browser Screenshot Diff needs the command-line tools its instructions call (npx). Our summary lists: Node.js. Its frontmatter pre-approves these tools: mcp__plugin_ruflo-core_ruflo__browser_eval, Bash, Read, Write.

Does Browser Screenshot Diff access the network?

SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Browser Screenshot Diff safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Browser Screenshot Diff use?

Browser Screenshot Diff is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Browser Screenshot Diff use?

About 623 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Browser Screenshot Diff?

Skills that share tags, products or a category with Browser Screenshot Diff: Review Local UI Screenshots (xiaocang/easydict_win32, 101 stars), Handsontable Visual Test Demos (handsontable/handsontable, 22k stars), Kc Screenshot (imran31415/kube-coder, 388 stars) and Visual QA (liangdabiao/Godogen, 127 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Browser Screenshot Diff?

ruvnet (a GitHub user) maintains it in ruvnet/ruflo, which has 74,012 GitHub stars. The repository holds 264 skills in this directory. The repository was last updated on October 7, 2026.

Source: ruvnet/ruflo on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.