Search available charts by criteria
AI agents call search_charts 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 or queries data about available navigational charts based on search parameters. It has no capability to modify, delete, or execute operations—it only searches and returns information. The blast radius of misuse is minimal, as incorrect search queries would simply return irrelevant chart data without affecting systems or data integrity.
From the tool's definition Tool name 'search_charts' with description 'Search available charts by criteria' indicates a query/discovery operation with no side effects.
Attacks that exploit this kind of access
Search available charts by criteria. 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 search_charts: 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.
search_charts 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 search_charts 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 search_charts. 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.
search_charts 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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