Retrieve chart data for a specific area by chart ID or coordinates
AI agents call get_chart 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 navigational chart data from NOAA sources based on chart ID or coordinates. It performs a read-only query operation with no side effects, data modification, or external command execution. The blast radius of misuse is minimal—an agent could retrieve charts for arbitrary locations but cannot modify, delete, or trigger external actions. This is a straightforward Read category tool.
From the tool's definition Tool name 'get_chart' and description 'Retrieve chart data' indicate data retrieval. The server is designed to 'access and analyze NOAA electronic navigational charts' with no mention of modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Retrieve chart data for a specific area by chart 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: 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 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 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. 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 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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