Per-trip departure schedule for a line. The upstream returns one of three modes via \
AI agents call bus_get_timetable to retrieve information from Chelaile 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 public transit timetable information. It performs a read-only data retrieval operation with no ability to modify, delete, execute code, or affect financial systems. The data returned (departure schedules) is informational only. Low severity because misuse would at worst provide incorrect transit information to a user, with no destructive or operational consequences.
From the tool's definition Tool name 'bus_get_timetable' and description indicate it retrieves 'per-trip departure schedule for a line' — a query operation that returns static timetable data with no side effects or modifications.
Documented attack patterns abuse exactly the kind of access bus_get_timetable gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Chelaile, and nothing reaches the server without passing your rules. This is the rule we recommend for bus_get_timetable:
{
"version": "1",
"default": "deny",
"tools": {
"bus_get_timetable": {}
}
}bus_get_timetable is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Per-trip departure schedule for a line. The upstream returns one of three modes via \. It is categorised as a Read tool in the Chelaile MCP Server, which means it retrieves data without modifying state.
Register the Chelaile MCP server in PolicyLayer and add a rule for bus_get_timetable: 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 Chelaile. Nothing to install.
bus_get_timetable 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_get_timetable 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_get_timetable. 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_get_timetable is provided by the Chelaile MCP server (peanutsplash/chelaile-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Chelaile, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
15 Chelaile tools catalogued and risk-classified — across an index of 43,000+ MCP servers.