AI agents call scan_announcement_signals to retrieve information from Tushare MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name suggests scanning/querying announcement data for signals, which is a read operation. Given the sibling tools are all Read operations (analyze, collect, filter, get variants), this follows the same pattern of retrieving stock market data without modifying or executing operations.
From the tool's definition Tool name 'scan_announcement_signals' and server context (Tushare stock information API) indicate data retrieval. Description is empty, limiting certainty.
Documented attack patterns abuse exactly the kind of access scan_announcement_signals gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Tushare MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for scan_announcement_signals:
{
"version": "1",
"default": "deny",
"tools": {
"scan_announcement_signals": {}
}
}scan_announcement_signals is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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scan_announcement_signals. It is categorised as a Read tool in the Tushare MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Tushare MCP Server MCP server in PolicyLayer and add a rule for scan_announcement_signals: 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 Tushare MCP Server. Nothing to install.
scan_announcement_signals 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 scan_announcement_signals 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 scan_announcement_signals. 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.
scan_announcement_signals is provided by the Tushare MCP Server MCP server (zhewenzhang/tushare_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 66 Tushare MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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66 Tushare MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.