Get information about S-57 object classes and their representations
AI agents call get_object_classes to retrieve information from ENC Charts MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that retrieves information about S-57 object class definitions and how they are represented in navigational charts. There is no modification, execution, deletion, or financial impact. The blast radius of misuse is minimal—an agent could only retrieve informational data about chart standards.
From the tool's definition Tool name 'get_object_classes' and description 'Get information about S-57 object classes and their representations' indicate data retrieval with no side effects. It queries metadata about maritime chart object classifications.
Attacks that exploit this kind of access
Get information about S-57 object classes and their representations. It is categorised as a Read tool in the ENC Charts MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ENC Charts MCP Server MCP server in PolicyLayer and add a rule for get_object_classes: 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 ENC Charts MCP Server. Nothing to install.
get_object_classes 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 get_object_classes 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 get_object_classes. 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.
get_object_classes is provided by the ENC Charts MCP Server MCP server (tonybentley/enc-charts-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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