AI agents call computer_screenshot to retrieve information from LocalAnt without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool captures and returns display imagery without creating, modifying, deleting, executing commands, or moving money. It is purely observational/data retrieval, matching the Read category. Severity is low because screenshots alone do not expose sensitive operations—they are passive observations of the current screen state, though they could reveal sensitive information depending on what is displayed.
From the tool's definition Tool name 'computer_screenshot' and description 'Capture a screenshot of the main display' indicates it retrieves visual data with no modification or side effects.
Attacks that exploit this kind of access
Capture a screenshot of the main display. Returns the image (resampled to logical resolution,. It is categorised as a Read tool in the LocalAnt MCP Server, which means it retrieves data without modifying state.
Register the LocalAnt MCP server in PolicyLayer and add a rule for computer_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 LocalAnt. Nothing to install.
computer_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 computer_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 computer_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.
computer_screenshot is provided by the LocalAnt MCP server (yuga-hashimoto/localant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
computer_screenshot is one line of LocalAnt's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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