Get information about a specific chart by ID or coordinates
AI agents call get_chart_metadata 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 tool retrieves chart metadata based on identifiers or location data. It is a read-only operation that queries and returns information about navigational charts without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an AI agent could at worst retrieve metadata about different charts, which poses no safety or operational risk.
From the tool's definition Tool name 'get_chart_metadata' and description 'Get information about a specific chart by ID or coordinates' indicate retrieval of metadata without modification. No destructive, financial, or code execution capabilities mentioned.
Attacks that exploit this kind of access
Get information about a specific chart by ID or coordinates. 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_chart_metadata: 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_chart_metadata 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_chart_metadata 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_chart_metadata. 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_chart_metadata 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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