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 station_code，结果是一个包含多个车站信息的列表。
Part of the 12306 Ticket Search Server server.
Free to start. No card required.
AI agents call get-stations-code-in-city to retrieve information from 12306 Ticket Search Server 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-stations-code-in-city 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-stations-code-in-city": {}
}
}See the full 12306 Ticket Search Server policy for all 8 tools.
These attack patterns abuse exactly the kind of access get-stations-code-in-city 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.
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 station_code，结果是一个包含多个车站信息的列表。. It is categorised as a Read tool in the 12306 Ticket Search Server MCP Server, which means it retrieves data without modifying state.
Register the 12306 Ticket Search Server 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 Ticket Search Server. 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 Ticket Search Server MCP server (DeniseLewis200081/rail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 12306 Ticket Search Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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