Publish browser_cdp via gitea-publish skill
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qwenpaw-skills
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---
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name: browser_cdp
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description: "Use this skill when the user explicitly wants to connect to a running Chrome browser, scan local CDP ports, specify a `cdp_port`, or share a single browser across multiple agents/tools. By default, browser_use already launches the browser using managed CDP; if the user does not want to expose browser history, cookies, or other sensitive data, recommend using `private_mode=true` instead."
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metadata:
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builtin_skill_version: "1.2"
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qwenpaw:
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emoji: "🔌"
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requires: {}
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---
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# Browser CDP Reference
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By default, **browser_use** launches and manages the local Chrome/Chromium via **managed CDP**, but this does not mean the CDP port should be exposed to the user or other tools every time.
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This skill focuses on more "explicit" CDP usage:
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1. **Scanning local CDP ports**
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2. **Connecting to an existing Chrome (`connect_cdp`)**
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3. **Explicitly specifying a `cdp_port` when launching the browser**
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4. **Sharing a single browser instance across multiple agents/tools**
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In other words:
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- The default `start` uses managed CDP under the hood, but users typically do not need to understand or be aware of CDP details
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- Only enter the scope of this skill when the user explicitly mentions "connect to an existing browser / scan ports / specify a port / share a browser"
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> **Privacy Recommendation**
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>
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> If the user does not want to expose browser history, cookies, page content, or session data, recommend using `private_mode=true`, which switches to Playwright-managed mode.
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> **Warning: One browser instance per workspace**
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>
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> Only one browser can be running or connected per workspace at a time. If a browser instance already exists, you must execute `stop` first before switching to a new browser or a new CDP connection.
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---
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## When to Use
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Use this skill only when the user explicitly expresses one of the following intentions:
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- "Connect to my already-open Chrome"
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- "Scan for available CDP ports on this machine"
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- "Launch the browser with a fixed debug port"
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- "Let other agents/tools connect to this browser too"
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- "Attach to the browser via the remote debugging port"
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In the following cases, you should typically **not** use this skill:
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- The user just says "open the browser"
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- The user just says "open a visible window"
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- The user does not mention sharing, ports, CDP, or remote debugging
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In these cases, use the standard `start`, adding `headed=true` if needed — refer to **browser_visible**.
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---
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## Scenario 1: Scanning Local CDP Ports
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Default scan range is **9000–10000**:
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```json
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{"action": "list_cdp_targets"}
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```
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Specify a single port:
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```json
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{"action": "list_cdp_targets", "port": 9222}
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```
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Custom scan range:
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```json
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{"action": "list_cdp_targets", "port_min": 8000, "port_max": 12000}
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```
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Use cases:
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- The user has manually launched Chrome with a remote debugging port
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- You do not know the exact port and need to scan first
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- You need to verify available attach targets on the local machine before connecting
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---
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## Scenario 2: Connecting to an Existing Chrome
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Connect to an existing CDP endpoint:
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```json
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{"action": "connect_cdp", "cdp_url": "http://localhost:9222"}
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```
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Characteristics:
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- After a successful connection, you can continue using standard operations such as `open`, `snapshot`, `click`, `type`, etc.
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- This **attaches to an external browser**, not a new process launched by QwenPaw
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- `stop` only disconnects — it **will not close the external browser**
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- External CDP connections are also subject to idle auto-stop management, but the auto-stop semantics for external CDP is "auto-disconnect, not close the external browser"
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Use cases:
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- The user has their own Chrome open and wants the agent to take over directly
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- You need to attach to the user's existing login state or open tabs
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---
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## Scenario 3: Launching with an Explicit cdp_port
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If the user explicitly requests a fixed port, or needs to provide the endpoint to other tools, specify `cdp_port` in `start`:
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```json
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{"action": "start", "cdp_port": 9222}
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```
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To also open a visible window:
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```json
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{"action": "start", "headed": true, "cdp_port": 9222}
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```
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Current behavior:
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- If the explicitly specified `cdp_port` is already in use, an error is raised immediately — it will not forcefully reuse the port
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- If `cdp_port` is not specified, an available port is automatically selected, which usually avoids multi-workspace conflicts
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- Auto-selecting an available port still has a tiny race window: between "finding an available port" and "Chrome actually binding to the port", another process could theoretically claim it; on failure, cleanup occurs and an error is reported, but there is no automatic retry
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Therefore:
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- **Do not pass `cdp_port` proactively when the user has not explicitly requested a port**
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- **Only pass `cdp_port` explicitly when the user requests a fixed port or external sharing**
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---
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## Multi-Workspace and Port Conflicts
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The current port strategy for multiple workspaces:
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- **Explicitly specified port**: checks whether `127.0.0.1:cdp_port` is already in use; if so, fails immediately and prompts the user to choose a different port or stop the old process
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- **No explicit port**: reduces conflict probability by automatically selecting an available port
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This means:
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- Multiple workspaces using the default launch can usually coexist
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- If multiple workspaces all request the same fixed `cdp_port`, the later one will fail because the port is already in use
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---
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## Stop Behavior
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CDP-related stop behavior differs depending on the type:
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### 1. Managed CDP launched by QwenPaw
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For example:
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```json
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{"action": "start"}
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```
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Or:
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```json
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{"action": "start", "cdp_port": 9222}
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```
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These browsers are launched and owned by QwenPaw. `stop` will:
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- Disconnect the Playwright / CDP connection
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- Terminate the browser process
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### 2. External CDP Browser
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For example:
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```json
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{"action": "connect_cdp", "cdp_url": "http://localhost:9222"}
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```
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These browsers are not launched by QwenPaw. `stop` will only:
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- Disconnect
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- **Not close the external browser process**
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---
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## Division of Responsibility with browser_visible
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- **browser_visible**: handles "whether to show a window" and "whether to use private_mode"
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- **browser_cdp**: handles "whether to connect / expose / specify / scan CDP ports"
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In short:
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- User cares about "seeing the browser window" → think browser_visible first
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- User cares about "connecting to an existing browser / specifying a debug port / sharing with others" → think browser_cdp first
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---
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## Notes
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- Although the default `start` uses managed CDP internally, this is the tool's default implementation detail and does not mean CDP concepts should be exposed to the user every time
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- Before using explicit CDP capabilities, warn the user about the risk of sensitive data exposure
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- Auto-stop for external CDP means "auto-disconnect," not "auto-close the user's browser"
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- Activity is currently refreshed primarily by tool operations; the user's manual interactions in the browser window typically do not reset the idle timer
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- `private_mode` is an explicit parameter for each `start` call and is not persisted as workspace state
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