AI agents call srs 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 queries meteorological data (sunrise/sunset times) from the Hong Kong Observatory API without performing any side effects, modifications, or external operations. It is a straightforward read operation that returns informational data based on date filters.
From the tool's definition Tool retrieves 'Times of Sunrise/Sunset' data via API request with optional date parameters (year, month, day). No modification, deletion, or execution capabilities are present. The description explicitly indicates data retrieval only.
Attacks that exploit this kind of access
Times of Sunrise/Sunset (SRS) API Request Parameters: - year: 2018-2024 - month: (Optional) 1-12 (requires year) - day: (Optional) 1-31 (requires year and month) - 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 srs: 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.
srs 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 srs 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 srs. 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.
srs 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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