AI agents call get_limit_up_count to retrieve information from Sfc Data without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries financial market data (limit-up board statistics for A-share stocks) and returns aggregate counts. It is a read-only operation with no side effects on data, user accounts, or financial positions. Even if misused by an AI agent, it only exposes historical or current market statistics, posing minimal risk.
From the tool's definition Tool name and description indicate data retrieval only: 'get_limit_up_count' retrieves limit-up statistics (板数, 开板数 = count of boards/boards opened), with no mention of modification, deletion, or financial transactions.
Attacks that exploit this kind of access
获取涨停统计（连板情况汇总：首板、1进2、2进3等封板数、开板数）. It is categorised as a Read tool in the Sfc Data MCP Server, which means it retrieves data without modifying state.
Register the Sfc Data MCP server in PolicyLayer and add a rule for get_limit_up_count: 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 Sfc Data. Nothing to install.
get_limit_up_count 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_limit_up_count 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_limit_up_count. 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_limit_up_count is provided by the Sfc Data MCP server (yangxinagfeng123/sfc-data-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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