AI agents call list_engines to retrieve information from Ocr without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the state of available OCR engines on the machine and returns metadata (names, usability status). It performs a read-only operation that retrieves information without modifying, executing, or deleting anything. The blast radius if misused is negligible—an AI agent cannot cause harm by listing available engines.
From the tool's definition Tool name 'list_engines' and description 'List OCR engines' indicates retrieval of configuration or status information with no side effects.
Attacks that exploit this kind of access
List OCR engines and whether each is currently usable on this machine. It is categorised as a Read tool in the Ocr MCP Server, which means it retrieves data without modifying state.
Register the Ocr MCP server in PolicyLayer and add a rule for list_engines: 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 Ocr. Nothing to install.
list_engines 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 list_engines 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 list_engines. 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.
list_engines is provided by the Ocr MCP server (prekzursil/abbyy-finereader-ocr-mcp). 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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