AI agents call query_trace to retrieve information from Kuaidi100 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 logistics tracking information. It is a read-only operation that fetches tracking status based on a tracking number input. No data is created, modified, deleted, or destroyed. No code execution or financial transactions occur.
From the tool's definition Tool name 'query_trace' and description '根据快递单号，返回对应的实时物流轨迹信息' (returns real-time logistics tracking information based on express tracking number) indicates retrieval of package tracking data with no modification or side effects.
Documented attack patterns abuse exactly the kind of access query_trace gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kuaidi100 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for query_trace:
{
"version": "1",
"default": "deny",
"tools": {
"query_trace": {}
}
}query_trace is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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根据快递单号，返回对应的实时物流轨迹信息. It is categorised as a Read tool in the Kuaidi100 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Kuaidi100 MCP Server MCP server in PolicyLayer and add a rule for query_trace: 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 Kuaidi100 MCP Server. Nothing to install.
query_trace 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 query_trace 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 query_trace. 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.
query_trace is provided by the Kuaidi100 MCP Server MCP server (kuaidi100-api/kuaidi100-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kuaidi100 MCP Server, 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.
5 Kuaidi100 MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.