Get real-time arrival predictions for buses/trains at a specific stop
Part of the Malaysia Transit MCP server.
Free to start. No card required.
AI agents call get_stop_arrivals to retrieve information from Malaysia Transit MCP without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though get_stop_arrivals only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"get_stop_arrivals": {}
}
}See the full Malaysia Transit MCP policy for all 43 tools.
These attack patterns abuse exactly the kind of access get_stop_arrivals gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Get real-time arrival predictions for buses/trains at a specific stop. It is categorised as a Read tool in the Malaysia Transit MCP MCP Server, which means it retrieves data without modifying state.
Register the Malaysia Transit MCP server in PolicyLayer and add a rule for get_stop_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 Malaysia Transit MCP. Nothing to install.
get_stop_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_stop_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_stop_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_stop_arrivals is provided by the Malaysia Transit MCP server (hithereiamaliff/mcp-malaysiatransit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 43 Malaysia Transit MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.