devlab-web-visual-ops

devlab-web-visual-ops is a skill for Claude Code, Codex from seed-forge/harness-ai-kit. It costs 176 tokens per session (3,071 once invoked), scanned A, original, Apache-2.0.

A browser-based operations guide for web applications, including single-page apps, micro-frontends, and multi-page sites. It covers observing, navigating, interacting, inspecting, validating, and capturing pages with browser automation and visual fallbacks.

In plain words
What is it for?
Use it to debug web pages, review interfaces, run browser tests, compare screenshots for visual regressions, automate browser tasks, and inspect pages whose DOM is unreliable, such as canvas-heavy interfaces.
Why use it?
It brings debugging, UI review, end-to-end testing, screenshot comparison, and browser automation into one repeatable workflow. It can inspect browser console, network, and runtime behavior when the page does not work as expected.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/seed-forge/harness-ai-kit/devlab-web-visual-ops
Any agent
npx skills add seed-forge/harness-ai-kit --skill devlab-web-visual-ops
Clone the repo
git clone --depth 1 https://github.com/seed-forge/harness-ai-kit

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for devlab-web-visual-ops

README.md
[![agentmods](https://agentmods.dev/badge/skills/seed-forge/harness-ai-kit/devlab-web-visual-ops.svg)](https://agentmods.dev/skills/seed-forge/harness-ai-kit/devlab-web-visual-ops)
Your own site
<a href="https://agentmods.dev/skills/seed-forge/harness-ai-kit/devlab-web-visual-ops"><img src="https://agentmods.dev/badge/skills/seed-forge/harness-ai-kit/devlab-web-visual-ops.svg" alt="Measured on agentmods" height="20"></a>
Per session 176 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,071 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00176 $0.03071
Opus 5 $0.00088 $0.01536
Sonnet 5 $0.00035 $0.00614
Haiku 4.5 $0.00018 $0.00307

Measured 4d ago against content hash 91dcb4dbebbd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

devlab-web-visual-ops scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/devlab-web-visual-ops/SKILL.md · 162 lines

How it starts

The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DevLab Web Visual Ops — Web 视觉化操作

Purpose

Web 应用做可重复的视觉化操作:观察页面、导航、交互、检查(Console/Network/Runtime)、验证、截图捕获,并沉淀为 Debug / UI Review / Visual Regression / E2E / Browser Automation 五类 Workflow 的标准化产物。

定位边界(与 Stagehand 的关系):Stagehand 本质是 AI Browser Automation;本技能是范围更大的 Web Visual Operations。因此 Stagehand 是 Router 层的 AI Adapter 之一,不是 Skill 底座。Console/Network/Trace/截图/视觉回归/UI Review 是 Skill 自己的核心能力,不抽象成"Stagehand 能力",避免被具体框架绑死。

适用条件

  • 目标是有浏览器 UI 的 Web 应用(SPA / 微前端 / MPA 均可);
  • 需要浏览器端到端执行的操作:视觉走查、UI 审查、页面调试、截图对比、视觉回归、浏览器自动化;
  • 执行环境可运行 Node ≥ 18 + Playwright。浏览器获取方式可选(三选一):① npx playwright install chromium 自动下载到 ms-playwright 缓存;② 复用已有 ms-playwright 缓存;③ 系统 Chrome/Edge(executablePathchannel)。无头模式默认可用:Playwright 与 Vision/CUA 路径还可用更轻的 chromium_headless_shell(实测三项全 PASS)。
  • Stagehand AI 增强路径需 Node ≥ 22.18.0 + newapi 消费 key(chat_default 模型,见 infra-aimodel-ops);必须完整 Chromium(headless 模式即可,实测全 PASS),headless shell 不支持扩展注入(实测失败)
  • 无 DOM 或 DOM 不可靠的场景(canvas / 复杂 iframe / 纯视觉渲染)走 Vision/CUA 兜底。

核心设计:三层架构

devlab-web-visual-ops
│
├── Core      能力原语(Observe / Navigate / Interact / Inspect / Validate / Capture)
├── Router    执行路由(Playwright / Stagehand / DevTools / Vision-CUA)
└── Workflows 业务闭环(Debug / UI Review / Visual Regression / E2E / Browser Automation)
  1. Core 定义"做什么",与具体执行器解耦;所有 Workflow 只调用 Core 原语。
  2. Router 决定"用谁执行":默认确定性执行(Playwright);AI 增强/非确定性页面切 Stagehand;Console/Network/Runtime 检查走 DevTools;无 DOM 走 Vision/CUA。统一输入 task + page,统一输出 action / observation / extraction 协议,保证执行器可替换。
  3. Workflows 组装"业务闭环":每个 Workflow 是 Core 原语 + Router 选路的固定编排,输出标准化产物。

资产结构

.visual-ops/
├── artifacts/          # 产物:screenshots/ traces/ hars/ 报告/ 视频
│   ├── baselines/      # 视觉回归基线(更新需用户确认 HD-3)
│   └── reports/        # Debug / UI Review / Regression 报告
├── cases/              # E2E / 自动化用例(复用 devlab-web-test-e2e 约定)
└── config.local.*      # 项目侧本地覆盖(不入库)

工作流

0. 入口:意图解析与 Router 判定

  1. 读取 ~/.harness-ai-kit/config.yamlassets.devlab-web-visual-ops 段(preview_base_url / preview_start_command / stagehand_enabled 等);缺失时按项目探测。
  2. 按用户意图归类到 Workflow(Debug / UI Review / Visual Regression / E2E / Browser Automation);意图不明确时询问用户。
  3. 按下表选择 Router 执行器;执行器不可用时按降级路径切换并记录原因。

Read the full file on GitHub · 162 lines

Files

What ships with it

9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 162 lines · 176 tokens per session scan A 91dcb4dbebbd

Subscribe to this mod's changes

devlab-web-visual-ops is a skill published in the GitHub repository seed-forge/harness-ai-kit (21 stars, last pushed 7d ago), licensed Apache-2.0. It adds 176 tokens to every session and 3,071 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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