browser_start_tracing

A execute tool on the Playwright MCP server.

SERVERPlaywright SOURCEhanato238/playwright-mcp

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/hanato238-playwright-mcp/browser-start-tracing.md

WHAT IT DOES

What browser_start_tracing does on Playwright

AI agents invoke browser_start_tracing to trigger actions in Playwright. 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_start_tracing is rated High

Starting browser tracing is an Execute action—it triggers external operations (browser instrumentation and data recording) whose effects depend on what subsequently happens in the browser during the traced session. While not immediately destructive, it executes a system operation that alters browser behavior.

From the tool's definition Tool belongs to @playwright/mcp browser automation server. Name 'browser_start_tracing' indicates initiation of browser tracing/recording functionality.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_start_tracing safely

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

browser_start_tracing Rate-limited

browser_start_tracing 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_start_tracing": {
      "limits": [
        {
          "counter": "browser_start_tracing_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 Playwright, apply this rule, and every browser_start_tracing call is checked against it from then on.

FAQ

Questions about browser_start_tracing

What does the browser_start_tracing tool do? +

browser_start_tracing is a execute tool on the Playwright MCP server. It is categorised as a Execute tool in the Playwright 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_start_tracing? +

Register the Playwright MCP server in PolicyLayer and add a rule for browser_start_tracing: 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 Playwright. Nothing to install.

What risk level is browser_start_tracing? +

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

Can I rate-limit browser_start_tracing? +

Yes. Add a rate_limit block to the browser_start_tracing 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_start_tracing completely? +

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

browser_start_tracing is provided by the Playwright MCP server (hanato238/playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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