Take a higher-resolution screenshot of a specific region of the last full-screen screenshot. Use this liberally to inspect small text, button labels, or fine UI details that are hard to read in the downsampled full-screen image.
AI agents call zoom to retrieve information from Computer Use Windows without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The zoom tool captures visual information from the screen to aid inspection of UI details. It is purely observational with no capacity to modify system state, execute code, delete data, or commit financial transactions. This is a classic Read operation with minimal risk—screenshots can reveal sensitive information if misused, but the tool itself performs only data retrieval.
From the tool's definition Tool description states it 'Take[s] a higher-resolution screenshot of a specific region' — a retrieval operation with no side effects. No modification, deletion, or execution of external operations occurs.
Attacks that exploit this kind of access
Take a higher-resolution screenshot of a specific region of the last full-screen screenshot. Use this liberally to inspect small text, button labels, or fine UI details that are hard to read in the downsampled full-screen image. It is categorised as a Read tool in the Computer Use Windows MCP Server, which means it retrieves data without modifying state.
Register the Computer Use Windows MCP server in PolicyLayer and add a rule for zoom: 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 Computer Use Windows. Nothing to install.
zoom 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 zoom 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 zoom. 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.
zoom is provided by the Computer Use Windows MCP server (wimi321/windows-computer-use-skill). 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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