Start recording the browser session as a video. This tool begins capturing all browser interactions as a WebM video file. It works by recycling the browser context with video recording enabled. Session state preservation: Cookies and localStorage are automatically saved and restored when the cont...
Part of the Playwright Stealth server.
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AI agents invoke browser_start_recording to trigger processes or run actions in Playwright Stealth. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
browser_start_recording can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"browser_start_recording": {
"limits": [
{
"counter": "browser_start_recording_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Playwright Stealth policy for all 6 tools.
These attack patterns abuse exactly the kind of access browser_start_recording gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Start recording the browser session as a video. This tool begins capturing all browser interactions as a WebM video file. It works by recycling the browser context with video recording enabled. Session state preservation: Cookies and localStorage are automatically saved and restored when the context is recycled. sessionStorage for the current origin is also preserved on a best-effort basis. In rare cases involving multiple origins, some state may not be restored — if you experience authentication issues, log in again. Behavior when already recording: If recording is already active, the current recording will be stopped (saving the video) and a new recording will begin. The video is NOT available until you call browser_stop_recording. Playwright only finalizes the video file when the recording context is closed. Returns: - Confirmation that recording has started - The URL the browser was previously on (if any) — the browser navigates back to it automatically. It is categorised as a Execute tool in the Playwright Stealth MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Playwright Stealth MCP server in PolicyLayer and add a rule for browser_start_recording: 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 Stealth. Nothing to install.
browser_start_recording is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the browser_start_recording 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.
Set action: deny in the PolicyLayer policy for browser_start_recording. 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.
browser_start_recording is provided by the Playwright Stealth MCP server (pulsemcp/mcp-servers). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Playwright Stealth tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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