bb-browser is a command-line tool and MCP server that lets AI agents control a user's real Chrome browser and its existing login sessions. Agents use it to interact with websites across 36 platforms through the browser interface rather than separate APIs or extracted credentials. The catalogue skills configure or expose bb-browser for agent workflows.
Borrowing it
Nothing to install: this file belongs to epiral/bb-browser. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/epiral/bb-browser/main/AGENTS.mdgit clone --depth 1 https://github.com/epiral/bb-browserWrote 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.
[](https://agentmods.dev/instructions/epiral/bb-browser/agents-md)<a href="https://agentmods.dev/instructions/epiral/bb-browser/agents-md"><img src="https://agentmods.dev/badge/instructions/epiral/bb-browser/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/epiral/bb-browser/agents-md"><img src="https://agentmods.dev/badge/instructions/epiral/bb-browser/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.02522 | $0.02522 |
| Opus 5.5 | $0.01009 | $0.01009 |
| Sonnet 5.5 | $0.00504 | $0.00504 |
| Haiku 4.5 | $0.00252 | $0.00252 |
Grade A, and why
bb-browser AGENTS.md 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 208 lines — stays where its author put it; the contents beside it link to each section on GitHub.
bb-browser Agent 开发规范
架构
CLI ──HTTP──▶ Daemon ──controlConn CDP──▶ Chrome
│
│ --hub 模式 (可选)
├── Hub ProviderStream ──▶ Pinix Hub
│
│ Protocol 2
└── Streamer (bb-viewer) ──captureConn + inputConn CDP──▶ Chrome
│
└── WebRTC video + DataChannel ──▶ Clip Web UI
三根 CDP 连接到同一个 Chrome：
| 连接 | Owner | 职责 |
|---|---|---|
| controlConn | daemon | Agent 操作：tab/nav/site/DOM/click-by-ref |
| inputConn | streamer | Human 实时输入：鼠标/键盘/IME (DataChannel → CDP) |
| captureConn | streamer | 视频流：screencast → VP8 → WebRTC |
组件：
| 组件 | 位置 | 职责 |
|---|---|---|
| CLI | packages/cli/ |
命令行入口，HTTP 调 daemon |
| Daemon | packages/daemon/ |
控制中心：CDP controlConn、HTTP API、Hub 连接、site 执行、streamer 管理 |
| Shared | packages/shared/ |
统一命令定义 (commands.ts)、协议类型 (protocol.ts) |
| Streamer | bb-viewer repo |
纯视频 + 实时输入（Go binary，daemon 子进程） |
Daemon 两种模式
# 本地模式：Agent 用 CLI 操作浏览器
bb-browser daemon start
# Hub 模式：注册到 Pinix Hub，远程可用
bb-browser daemon start --hub https://hub.pinixai.com --hub-token xxx
协议
Protocol 1: CLI ↔ daemon (POST /command)
请求：{"method": "snap", "params": {"tab": "3ef9"}}
成功：{"result": {"tab": "3ef9", "title": "Google", "snapshot": "..."}}
失败：{"error": {"message": "Missing --tab", "hint": "Run 'bb-browser tab list'"}}
Protocol 2: daemon ↔ streamer (POST /command)
| Method | Params | 说明 |
|---|---|---|
| connect | {cdpUrl, ice?} | 连接 CDP，创建 WebRTC peer |
| answer | {answer_sdp, candidates} | 完成 WebRTC 信令 |
| switch | {cdpUrl} | 切到新 tab（peer 不变） |
| stop | {} | 停止 |
统一命令定义
packages/shared/src/commands.ts 是所有命令的单一定义源。每个命令包含 method、group、description、requiresTab、params。CLI 解析、daemon dispatch、Hub 注册都从这里读取。
添加新命令：
commands.ts— 添加 CommandDefprotocol.ts— 添加 ActionTypecommand-dispatch.ts— 添加处理分支packages/cli/src/commands/<name>.ts+index.ts— CLI 命令
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.
- 2mo ago First seen · 208 lines · 2,522 tokens per session scan A 67667ad433d6
bb-browser AGENTS.md is an instructions file published in the GitHub repository epiral/bb-browser (6,260 stars, last pushed 5mo ago), licensed MIT. It adds 2,522 tokens to every session, about $0.0101 per session on Opus 5.5. 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.
bb-browser AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| bb-browser AGENTS.mdepiral/bb-browser | Instructions file | 6.3k | 5mo ago | MIT | A | 2,522 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |