Rainfall in the Past Hour from Automatic Weather Station API Request Parameters: - lang: Language option (en, tc, sc) - default: en Request Example: https://data.weather.gov.hk/weatherAPI/opendata/hourlyRainfall.php?lang=en Response Keys: - obsTime: Observation time in ISO 8601 format - hourlyRai...
AI agents call hourlyrainfall 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 performs data retrieval only—it queries historical weather observation data from the Hong Kong Observatory's automatic weather stations and returns rainfall measurements. There are no side effects, no data modification, no code execution, and no destructive operations. The single parameter 'lang' merely controls the language of the response.
From the tool's definition Tool retrieves 'Rainfall in the Past Hour from Automatic Weather Station API Request' with response keys including obsTime, hourlyRainfall array data, and station identifiers. No parameters allow modification, deletion, or execution of operations.
Attacks that exploit this kind of access
Rainfall in the Past Hour from Automatic Weather Station API Request Parameters: - lang: Language option (en, tc, sc) - default: en Request Example: https://data.weather.gov.hk/weatherAPI/opendata/hourlyRainfall.php?lang=en Response Keys: - obsTime: Observation time in ISO 8601 format - hourlyRainfall: Array of rainfall data from automatic weather stations - automaticWeatherStation: Name of the weather station - automaticWeatherStationID: ID of the weather station - value: Rainfall amount - unit: Measurement unit (mm) Response example: {. 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 hourlyrainfall: 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.
hourlyrainfall 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 hourlyrainfall 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 hourlyrainfall. 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.
hourlyrainfall 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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