ura_median_rentals
AI agents call ura_median_rentals to retrieve information from OneMap MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves statistical rental information without modifying, executing operations, deleting data, or moving funds. It fits the Read category as a data retrieval/query tool. Severity is low because rental statistics are public information with no blast radius if misused by an agent—at worst, an agent could gather real estate market data unnecessarily.
From the tool's definition Tool name 'ura_median_rentals' indicates it retrieves median rental data from Singapore's Urban Redevelopment Authority (URA).
Attacks that exploit this kind of access
ura_median_rentals. It is categorised as a Read tool in the OneMap MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OneMap MCP Server MCP server in PolicyLayer and add a rule for ura_median_rentals: 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 OneMap MCP Server. Nothing to install.
ura_median_rentals 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 ura_median_rentals 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 ura_median_rentals. 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.
ura_median_rentals is provided by the OneMap MCP Server MCP server (linzele/mcp-onemap). 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.
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