AI agents call read_screen_text to retrieve information from GachaMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs optical character recognition to extract visible text from the game screen. It retrieves information without side effects, making it a Read category tool. The severity is low because OCR of screen text poses minimal risk—it cannot execute commands, modify data, or cause irreversible changes.
From the tool's definition Tool description indicates 'OCR' (Optical Character Recognition) functionality to 'read all text on the current game screen'.
Attacks that exploit this kind of access
Tool OCR chung để đọc tất cả text trên màn hình game hiện tại. It is categorised as a Read tool in the GachaMCP MCP Server, which means it retrieves data without modifying state.
Register the Gacha MCP server in PolicyLayer and add a rule for read_screen_text: 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 GachaMCP. Nothing to install.
read_screen_text 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 read_screen_text 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 read_screen_text. 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.
read_screen_text is provided by the Gacha MCP server (nguyenhuynhphuvinh/gachamcp). 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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