Take a screenshot of a specific region and return it as a base64-encoded PNG.
AI agents call screenshot_region to retrieve information from ComputerMate without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool captures visual information from the screen without side effects. It queries the current state of the display and returns data. No code is executed, no data is modified or deleted, and no external operations are triggered. It is purely informational/observational, fitting the 'Read' category.
From the tool's definition Tool name 'screenshot_region' and description 'Take a screenshot of a specific region and return it as a base64-encoded PNG' indicate data retrieval only.
Attacks that exploit this kind of access
Take a screenshot of a specific region and return it as a base64-encoded PNG. It is categorised as a Read tool in the ComputerMate MCP Server, which means it retrieves data without modifying state.
Register the ComputerMate MCP server in PolicyLayer and add a rule for screenshot_region: 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 ComputerMate. Nothing to install.
screenshot_region 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 screenshot_region 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 screenshot_region. 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.
screenshot_region is provided by the ComputerMate MCP server (one710/computermate). 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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