AI agents call sg_carpark_availability 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 retrieves real-time parking availability data from Singapore's public HDB carpark system. It performs a read-only lookup operation with no capability to modify data, execute commands, delete records, or commit financial transactions. The lowest severity applies because misuse would only return carpark information without operational consequences.
From the tool's definition Tool name 'sg_carpark_availability' and description 'Get real-time HDB carpark lot availability across Singapore. Use to find available parking' indicate retrieval of public data with no modifications, side effects, or external operations triggered.
Attacks that exploit this kind of access
Get real-time HDB carpark lot availability across Singapore. Use to find available parking. 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_carpark_availability: 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_carpark_availability 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_carpark_availability 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_carpark_availability. 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_carpark_availability 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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