AI agents call sg_taxi_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 only queries and returns real-time taxi availability data from Singapore's public data source. It has no side effects, cannot modify or delete data, and poses minimal security risk if misused by an AI agent. The information returned is already public and regularly published by data.gov.sg.
From the tool's definition Tool retrieves 'real-time count and locations of available taxis' with no modification, deletion, or execution capabilities. Pure data query operation.
Attacks that exploit this kind of access
Get real-time count and locations of available taxis in Singapore. 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_taxi_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_taxi_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_taxi_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_taxi_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_taxi_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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