Take a screenshot of the current page, a specific element, or a page region. Captures the visible viewport, full page, a specific element, or a rectangular region as a PNG image. Screenshots are saved to filesystem storage and can be accessed later via MCP resources. Parameters: - fullPage: Wheth...
Part of the Playwright Stealth server.
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AI agents call browser_screenshot to retrieve information from Playwright Stealth without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though browser_screenshot only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"browser_screenshot": {}
}
}See the full Playwright Stealth policy for all 6 tools.
These attack patterns abuse exactly the kind of access browser_screenshot gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Take a screenshot of the current page, a specific element, or a page region. Captures the visible viewport, full page, a specific element, or a rectangular region as a PNG image. Screenshots are saved to filesystem storage and can be accessed later via MCP resources. Parameters: - fullPage: Whether to capture the full scrollable page (default: false) - selector: CSS selector of a specific element to screenshot (e.g., '#main-content', '.hero-banner', 'table.results') - clip: Region of the page to screenshot as {x, y, width, height} in pixels - resultHandling: How to handle the result: - saveAndReturn (default): Saves to storage AND returns inline base64 image - saveOnly: Saves to storage and returns only the resource URI (more efficient for large screenshots) Note: fullPage, selector, and clip are mutually exclusive. Only one can be specified per call. Returns: - With saveAndReturn: Inline base64 PNG image data plus a resource_link to the saved file - With saveOnly: A resource_link with the file:// URI to the saved screenshot Dimension Limits: Full-page screenshots are limited to 8000 pixels in any dimension. If a full-page screenshot would exceed this limit, it is automatically clipped from the top-left corner and a warning is included in the response. Element and clip screenshots are not subject to this limit. Use cases: - Verify page state after navigation - Screenshot a specific element like a chart, table, or form - Capture a region of the page by coordinates - Debug automation issues - Store screenshots for later reference via MCP resources. It is categorised as a Read tool in the Playwright Stealth MCP Server, which means it retrieves data without modifying state.
Register the Playwright Stealth MCP server in PolicyLayer and add a rule for browser_screenshot: 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_screenshot is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the browser_screenshot 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_screenshot. 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_screenshot 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.
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