AI agents call get_etf_ranking 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 retrieves and queries financial market data (ETF rankings) without modifying, deleting, or executing any operations. It is a read-only lookup tool that presents pre-calculated or real-time ranking information. No data is created, modified, deleted, or executed as a result of calling this tool.
From the tool's definition Tool name is 'get_etf_ranking' and description states '获取ETF排行榜（涨幅榜、跌幅榜等）' which translates to 'Get ETF rankings (gainers list, losers list, etc.)'. This is a pure data retrieval operation with no side effects.
Attacks that exploit this kind of access
获取ETF排行榜（涨幅榜、跌幅榜等）. 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_etf_ranking: 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_etf_ranking 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_etf_ranking 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_etf_ranking. 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_etf_ranking 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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