通过中文城市名查询该城市 所有 火车站的名称及其对应的
AI agents call get-stations-code-in-city to retrieve information from 12306 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a search/lookup operation to retrieve train station data for a given city. It has no side effects, does not modify data, execute commands, or affect financial systems. It is purely informational retrieval, fitting the 'Read' category.
From the tool's definition Tool name 'get-stations-code-in-city' and description indicate it queries/retrieves station information by city name.
Documented attack patterns abuse exactly the kind of access get-stations-code-in-city gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and 12306, and nothing reaches the server without passing your rules. This is the rule we recommend for get-stations-code-in-city:
{
"version": "1",
"default": "deny",
"tools": {
"get-stations-code-in-city": {}
}
}get-stations-code-in-city is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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通过中文城市名查询该城市 所有 火车站的名称及其对应的. It is categorised as a Read tool in the 12306 MCP Server, which means it retrieves data without modifying state.
Register the 12306 MCP server in PolicyLayer and add a rule for get-stations-code-in-city: 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 12306. Nothing to install.
get-stations-code-in-city 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-stations-code-in-city 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-stations-code-in-city. 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-stations-code-in-city is provided by the 12306 MCP server (joooook/12306-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from 12306, 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.
8 12306 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.