browserbase_stagehand_act · Browserbase MCP Server MCP

WHAT IT DOES

What browserbase_stagehand_act does on Browserbase MCP Server

AI agents invoke browserbase_stagehand_act to trigger actions in Browserbase MCP Server. 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.

WHY IT NEEDS A POLICY

Why browserbase_stagehand_act needs a policy

This tool executes actions on live web pages in a cloud browser, which can trigger any number of real-world side effects depending on the page (form submissions, button clicks, purchases, logins). It falls under Execute as it performs operations whose outcomes are entirely argument-dependent.

From the tool's definition 'Performs an action on a web page element' — triggers external browser interactions (clicks, form submissions, etc.) whose effects depend on the target element and action arguments

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browserbase_stagehand_act Rate-limited

browserbase_stagehand_act 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": {
    "browserbase_stagehand_act": {
      "limits": [
        {
          "counter": "browserbase_stagehand_act_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Browserbase MCP Server, so you can run agents against it safely.

FAQ

Questions about browserbase_stagehand_act

What does the browserbase_stagehand_act tool do? +

Performs an action on a web page element. Act actions should be as atomic and. It is categorised as a Execute tool in the Browserbase MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on browserbase_stagehand_act? +

Register the Browserbase MCP Server MCP server in PolicyLayer and add a rule for browserbase_stagehand_act: 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 Browserbase MCP Server. Nothing to install.

What risk level is browserbase_stagehand_act? +

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

Can I rate-limit browserbase_stagehand_act? +

Yes. Add a rate_limit block to the browserbase_stagehand_act 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 browserbase_stagehand_act completely? +

Set action: deny in the PolicyLayer policy for browserbase_stagehand_act. 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 browserbase_stagehand_act? +

browserbase_stagehand_act is provided by the Browserbase MCP Server MCP server (vaibhavatlys/mcp-server-browserbase). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.