AI agents call ryes 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 is a straightforward data retrieval tool that fetches weather and radiation level reports from the Hong Kong Observatory API. It accepts only read-only input parameters (date in YYYYMMDD format and language selection) and returns reporting data. There is no capability to modify, delete, execute arbitrary operations, or perform financial transactions.
From the tool's definition Tool retrieves 'Weather and Radiation Level Report (RYES)' data via API request with date and language parameters. No parameters permit modifications, deletions, or financial transactions. The tool queries existing data without side effects.
Attacks that exploit this kind of access
Weather and Radiation Level Report (RYES) API Request Parameters: - date: Date of report (YYYYMMDD format) - 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 ryes: 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.
ryes 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 ryes 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 ryes. 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.
ryes 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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