AI agents call bus_get_line_realtime 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 retrieves realtime transit line information (likely bus/metro arrival times, vehicle locations, or route status). It is a GET-style operation that queries existing data without creating, modifying, deleting, or executing code. The blast radius of misuse is minimal — an agent could at worst spam queries or gather transit information, neither of which causes harm or data loss.
From the tool's definition Tool name 'bus_get_line_realtime' and context of sibling tools (bus_get_city_config, bus_get_line_detail, bus_get_line_route, bus_get_timetable, bus_list_cities, bus_list_line_buses, bus_plan_transit) indicate data retrieval operations.
Documented attack patterns abuse exactly the kind of access bus_get_line_realtime 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_line_realtime:
{
"version": "1",
"default": "deny",
"tools": {
"bus_get_line_realtime": {}
}
}bus_get_line_realtime is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Canonical. 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_line_realtime: 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_line_realtime 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_line_realtime 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_line_realtime. 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_line_realtime 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.
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15 Chelaile tools catalogued and risk-classified — across an index of 43,000+ MCP servers.