browser_attach

Attach to an existing Chrome browser session via Chrome DevTools Protocol.

SERVERCoWork OS SOURCECoWork-OS/CoWork-OS

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/cowork-os/browser-attach.md

WHAT IT DOES

What browser_attach does on CoWork OS

AI agents invoke browser_attach to trigger actions in CoWork OS. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why browser_attach is rated High

Attaching to a Chrome session via CDP grants full programmatic control over the browser — enabling arbitrary JavaScript execution, DOM manipulation, network interception, credential harvesting, and navigation. This is an Execute-class capability with high blast radius because an AI agent could silently interact with any open tab, exfiltrate data, or perform actions on behalf of the user within authenticated sessions.

From the tool's definition Attach to an existing Chrome browser session via Chrome DevTools Protocol

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_attach safely

PolicyLayer is an MCP gateway: it sits between your AI agents and CoWork OS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browser_attach, this is the rule to start with:

browser_attach Rate-limited

browser_attach stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "browser_attach": {
      "limits": [
        {
          "counter": "browser_attach_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect CoWork OS, apply this rule, and every browser_attach call is checked against it from then on.

FAQ

Questions about browser_attach

What does the browser_attach tool do? +

Attach to an existing Chrome browser session via Chrome DevTools Protocol. It is categorised as a Execute tool in the CoWork OS MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on browser_attach? +

Register the CoWork OS MCP server in PolicyLayer and add a rule for browser_attach: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches CoWork OS. Nothing to install.

What risk level is browser_attach? +

browser_attach is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit browser_attach? +

Yes. Add a rate_limit block to the browser_attach rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block browser_attach completely? +

Set action: deny in the PolicyLayer policy for browser_attach. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides browser_attach? +

browser_attach is provided by the CoWork OS MCP server (CoWork-OS/CoWork-OS). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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