AI agents call ltmv to retrieve information from Mcp Hko without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves current weather visibility measurements from the Hong Kong Observatory API. It has no side effects, does not modify data, execute code, or perform financial transactions. It is a read-only data retrieval operation with minimal security impact.
From the tool's definition Tool name 'ltmv' (Latest 10-minute Mean Visibility) and description indicate retrieval of weather observation data. No parameters enable modification, deletion, or execution of arbitrary operations. This is a straightforward meteorological data query endpoint.
Attacks that exploit this kind of access
Latest 10-minute Mean Visibility (LTMV) API Request Parameters: - lang:. It is categorised as a Read tool in the Mcp Hko MCP Server, which means it retrieves data without modifying state.
Register the Mcp Hko MCP server in PolicyLayer and add a rule for ltmv: 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 Mcp Hko. Nothing to install.
ltmv 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 ltmv 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 ltmv. 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.
ltmv is provided by the Mcp Hko MCP server (louiscklaw/mcp-hko). 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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