AI agents call sg_uv_index to retrieve information from Sg Data without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns environmental data (UV index) for informational purposes. It has no capability to modify, delete, execute commands, or create financial obligations. The blast radius of misuse is minimal — worst case, an AI agent provides incorrect sun exposure guidance based on queried data. Classified as Read.
From the tool's definition sg_uv_index retrieves real-time UV index readings. The description states 'Get Singapore real-time UV index readings' and 'Use when you need to know sun exposure risk' — purely informational query with no side effects, data modification, or external…
Attacks that exploit this kind of access
Get Singapore real-time UV index readings. Use when you need to know sun exposure risk in Singapore for outdoor activities. It is categorised as a Read tool in the Sg Data MCP Server, which means it retrieves data without modifying state.
Register the Sg Data MCP server in PolicyLayer and add a rule for sg_uv_index: 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 Sg Data. Nothing to install.
sg_uv_index 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 sg_uv_index 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 sg_uv_index. 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.
sg_uv_index is provided by the Sg Data MCP server (vdineshk/sg-data-mcp). 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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