AI agents call swt 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 weather tips from the Hong Kong Observatory API. It has no side effects, does not modify data, does not execute code or commands, and does not involve financial transactions. It is a simple read operation that queries and returns weather information, consistent with other sibling tools on this server (feltearthquake, hourlyrainfall, etc.) which are all data retrieval endpoints.
From the tool's definition Tool name is 'swt' (Special Weather Tips) and description indicates it is an 'API Request' for retrieving weather data. The tool parameters show only 'lang' (language selection), with no parameters for modification, deletion, or execution of arbitrary code.
Attacks that exploit this kind of access
Special Weather Tips (swt) 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 swt: 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.
swt 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 swt 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 swt. 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.
swt 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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