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Browser Cdp Agent Skill

Use this skill when you need to control a Chrome browser via CDP (Chrome DevTools Protocol) to reuse existing login sessions. Covers: launching Chrome in debug mode, opening URLs, waiting for page load, evaluating JavaScript, taking snapshots, and extracting auth tokens. Trigger phrases: browser automation, CDP, agent-browser, 浏览器操作, 操作浏览器, Chrome CDP, 复用登录态, extract token from browser.

1.6k tokens
context cost
SKILL.md, read when the skill is used
2
files
ships runnable scripts
0
copies elsewhere
how many repositories repackaged it
4 969
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository
npx skills add https://github.com/worldwonderer/oh-story-claudecode --skill browser-cdp

The instruction itself

6 sections, as written by the author

Browser CDP 操作工具

通过 CDP 协议控制 Chrome,复用已有登录态,执行浏览器自动化操作。

前置条件

  • macOS / Linux / Windows(实验性),已安装 Google Chrome
  • Node.js 20+
  • agent-browser 已安装:npm install -g agent-browser

> ⚠️ 首次启动会 kill 用户的常规 Chrome。 在启动前必须征求用户同意(见下方"启动流程"),否则用户可能丢失未保存的标签页/草稿。


启动流程(skill-mode 强制步骤)

第一步:探测当前状态(无副作用)

node {SKILL_DIR}/scripts/setup-cdp-chrome.js 9222 --detect-only

输出形如:

CDP_STATUS=ready                        # 已就绪,可直接复用
CDP_URL=http://127.0.0.1:9222/json/version
BROWSER=Chrome/148.0.7778.168

或:

CDP_STATUS=needs-setup
CHROME_RUNNING=yes                      # 用户有 Chrome 在跑,启动会杀掉
CHROME_PID_COUNT=3

第二步:根据探测结果分支

  • CDP_STATUS=ready → 直接使用 agent-browser --cdp 9222 ...,不要运行 setup。
  • CDP_STATUS=needs-setup 且 CHROME_RUNNING=no → 安全启动:
  node {SKILL_DIR}/scripts/setup-cdp-chrome.js 9222 --yes
  • CDP_STATUS=needs-setup 且 CHROME_RUNNING=yes → 先用 AskUserQuestion 工具向用户确认:告知会杀掉 N 个 Chrome 进程、可能丢失未保存工作;用户同意后再带 --yes 启动;用户拒绝则放弃这次自动化。

为什么不能直接 --yes: 脚本在非 TTY(即 skill 模式 / Bash 工具)下,如果检测到 Chrome 在跑而没有 --yes,会以退出码 3 报 NEEDS_CONSENT: ... 并中止,不会静默杀进程。这是有意的兜底——但 skill 流程仍应先问用户,而不是看到 3 就盲传 --yes。


启动脚本选项

| 选项 | 说明 |

|------|------|

| --detect-only | 只探测,不修改任何状态(skill 用) |

| --yes | 已征得同意,跳过交互提示 |

| --reset | 启动前清空 ~/chrome-debug-profile(登录失效时用) |

| --profile <name> | 使用非 Default 的 Chrome profile(如 "Profile 1") |

| --dry-run | 打印将执行的步骤,不执行 |

退出码:0 成功 / 1 通用错误 / 2 用户拒绝(TTY)/ 3 需同意但缺 --yes。


常用操作

打开页面并等待加载

agent-browser --cdp 9222 open "<URL>"
agent-browser --cdp 9222 wait 3000

提取页面文本

agent-browser --cdp 9222 eval 'document.body.innerText.substring(0, 8000)'

提取 Auth Token

agent-browser --cdp 9222 eval 'localStorage.getItem("token") || document.cookie'

复杂 JS(含引号 / $ / 反引号)

shell 转义容易出错,用以下两种方式之一:

# 1) base64 包裹
agent-browser --cdp 9222 eval -b "$(echo -n "document.querySelectorAll('a').length" | base64)"

# 2) heredoc + --stdin
cat <<'EOF' | agent-browser --cdp 9222 eval --stdin
const links = document.querySelectorAll('a');
links.length;
EOF

页面交互(snapshot 拿元素引用)

agent-browser --cdp 9222 snapshot -i        # 仅交互元素
agent-browser --cdp 9222 click "<CSS or @e1>"
agent-browser --cdp 9222 type "<sel>" "<text>"

停止 / 清理

  • 关掉 debug Chrome 窗口即可(或 pkill -9 -x 'Google Chrome' / taskkill /F /IM chrome.exe)。
  • 登录态失效:node {SKILL_DIR}/scripts/setup-cdp-chrome.js 9222 --reset --yes(注意 --yes 同样需要先问用户)。

OpenCode 环境注意事项

opencode 没有后台执行命令行的工具,长时间的 CDP 操作(如等待页面加载、大批量数据抓取)会阻塞整个会话,导致 CLI 无响应。

超时包装

Windows 上对 CDP 命令使用 PowerShell Job 包装超时:

$job = Start-Job { agent-browser --cdp 9222 eval "window.location.replace('https://www.qidian.com/rank/')" }
Wait-Job $job -Timeout 30 | Out-Null
if ($job.State -eq 'Running') { Stop-Job $job; Write-Output "⏱ CDP 操作超时(30s),请重试或手动打断" }
else { Receive-Job $job }
Remove-Job $job -Force

macOS / Linux 上使用 timeout 命令:

timeout 30 agent-browser --cdp 9222 eval "window.location.replace('https://www.qidian.com/rank/')" || echo "⏱ CDP 操作超时(30s),请重试或手动打断"

已知限制

即使加了超时包装,以下场景仍可能出现问题:

| 场景 | 风险 | 缓解 |

|------|------|------|

| 页面加载超时 | eval 命令等待永不返回 | 设置 30s 超时,超时后重试 |

| 大批量数据抓取 | 多页翻页时累计等待过长 | 每页独立超时,失败后从断点继续 |

| Chrome 进程僵死 | CDP 连接断开但进程未退出 | 用 pkill / taskkill 清理后重连 |

| 网络波动 | 请求挂起无超时 | 超时后自动重试一次 |

如遇到持续卡死的操作,在 opencode 中按 ESC 手动打断。


常见问题

| 问题 | 解决方案 |

|------|----------|

| NEEDS_CONSENT + 退出码 3 | 用 AskUserQuestion 询问用户是否允许杀掉 Chrome,同意后加 --yes 重跑 |

| CDP 端口未监听 | --detect-only 再确认;端口被占用则换端口 |

| 页面跳转到登录页 | snapshot -i 找登录按钮并操作 |

| eval 返回 null | 检查 localStorage key 名;含引号的 JS 用 eval -b 或 --stdin |

| 登录态过期 | setup-cdp-chrome.js 9222 --reset --yes 重新拷贝 |

| 有多个 Chrome profile | --profile "Profile 1" 指定 |

| Chrome 不会启动(30s 超时) | 试 --reset;检查端口冲突;查看 ~/chrome-debug-profile/ 是否损坏 |

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How to use it

Copy the folder

Take worldwonderer/browser-cdp from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.

Install what it needs

The instructions reference npm. Without those the skill loads but fails at the first command.