Get real-time bus arrival information for a specific bus stop and optionally a specific service number. Returns estimated arrival times, bus locations, and crowding levels.
AI agents call bus_arrival to retrieve information from Singapore LTA MCP Server 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 transportation data from Singapore's LTA. It performs a read operation only, returning bus arrival times, locations, and crowding information without creating, modifying, deleting, or executing any external operations. The blast radius of misuse is minimal — an agent could request excessive queries but cannot harm systems or data.
From the tool's definition Tool 'Get real-time bus arrival information' with 'Returns estimated arrival times, bus locations, and crowding levels' — purely retrieval with no mutations or side effects.
Attacks that exploit this kind of access
Get real-time bus arrival information for a specific bus stop and optionally a specific service number. Returns estimated arrival times, bus locations, and crowding levels. It is categorised as a Read tool in the Singapore LTA MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Singapore LTA MCP Server MCP server in PolicyLayer and add a rule for bus_arrival: 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 Singapore LTA MCP Server. Nothing to install.
bus_arrival 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 bus_arrival 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 bus_arrival. 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.
bus_arrival is provided by the Singapore LTA MCP Server MCP server (mcpflow/mcp-sg-lta). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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