Get the latest screenshot of the page viewport as a PNG image
AI agents call get_page_screenshot to retrieve information from Mcp Browser Lens without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only captures visual state of a running webpage and returns an image for analysis. It has no side effects, creates no data modifications, executes no code, and poses no destructive or financial risk. The only concern is potential information disclosure if sensitive UI elements are visible on the page, but the tool itself is a read operation.
From the tool's definition Tool captures and retrieves a screenshot of the page viewport without modifying any data. The description states it 'Get[s] the latest screenshot' - a pure retrieval operation.
Attacks that exploit this kind of access
Get the latest screenshot of the page viewport as a PNG image. It is categorised as a Read tool in the Mcp Browser Lens MCP Server, which means it retrieves data without modifying state.
Register the Mcp Browser Lens MCP server in PolicyLayer and add a rule for get_page_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 Mcp Browser Lens. Nothing to install.
get_page_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 get_page_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 get_page_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.
get_page_screenshot is provided by the Mcp Browser Lens MCP server (nano-step/mcp-browser-lens). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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