Get real-time bus arrivals at a specific bus stop, optionally filtered by bus line.
AI agents call get_bus_arrivals to retrieve information from TFL MCP Server for Poke without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries public transportation arrival information. It has no capability to modify data, execute commands, delete records, or initiate financial transactions. The blast radius of misuse is minimal—worst case, an agent might spam queries or retrieve data it shouldn't access, but no irreversible or harmful actions are possible. This is a straightforward Read operation.
From the tool's definition Tool name 'get_bus_arrivals' and description 'Get real-time bus arrivals at a specific bus stop' indicate retrieval of public transit data with no modification or side effects.
Attacks that exploit this kind of access
Get real-time bus arrivals at a specific bus stop, optionally filtered by bus line. It is categorised as a Read tool in the TFL MCP Server for Poke MCP Server, which means it retrieves data without modifying state.
Register the TFL MCP Server for Poke MCP server in PolicyLayer and add a rule for get_bus_arrivals: 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 TFL MCP Server for Poke. Nothing to install.
get_bus_arrivals 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 get_bus_arrivals 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 get_bus_arrivals. 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.
get_bus_arrivals is provided by the TFL MCP Server for Poke MCP server (vjagiasi/tfl-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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