Times and Heights of Astronomical High and Low Tides (HLT) API Request Parameters: - station: CCH/CLK/CMW/KCT/KLW/LOP/MWC/QUB/SPW/TAO/TBT/TMW/TPK/WAG - year: 2022-current year+1 - month: (Optional) 1-12 - day: (Optional) 1-31 - hour: (Optional) 1-24 - rformat:
AI agents call hlt 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 a pure read operation querying historical and forecast tide data. It has no capability to modify, delete, or execute code. The parameters are all input filters for data retrieval. There is no mention of write operations, financial transactions, or system execution.
From the tool's definition Tool retrieves 'Times and Heights of Astronomical High and Low Tides' data from Hong Kong Observatory API. Parameters allow filtering by station, year, month, day, and hour.
Attacks that exploit this kind of access
Times and Heights of Astronomical High and Low Tides (HLT) API Request Parameters: - station: CCH/CLK/CMW/KCT/KLW/LOP/MWC/QUB/SPW/TAO/TBT/TMW/TPK/WAG - year: 2022-current year+1 - month: (Optional) 1-12 - day: (Optional) 1-31 - hour: (Optional) 1-24 - rformat:. 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 hlt: 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.
hlt 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 hlt 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 hlt. 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.
hlt 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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