AI agents call stock_a_ttm_lyr to retrieve information from China Stock MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to retrieve historical or statistical stock data without modifying it, matching the Read category (fetch/query). Severity is low because misuse only exposes market data. Confidence is reduced to 0.7 due to empty description, but sibling tools and naming convention strongly suggest read-only market data retrieval.
From the tool's definition Tool name 'stock_a_ttm_lyr' suggests retrieval of stock metrics (TTM = trailing twelve months, LYR = last year ratio), consistent with data-fetching pattern of sibling tools like 'stock_a_high_low_statistics' and 'stock_a_indicator_lg'.
Documented attack patterns abuse exactly the kind of access stock_a_ttm_lyr gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and China Stock MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for stock_a_ttm_lyr:
{
"version": "1",
"default": "deny",
"tools": {
"stock_a_ttm_lyr": {}
}
}stock_a_ttm_lyr is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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stock_a_ttm_lyr. It is categorised as a Read tool in the China Stock MCP Server MCP Server, which means it retrieves data without modifying state.
Register the China Stock MCP Server MCP server in PolicyLayer and add a rule for stock_a_ttm_lyr: 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 China Stock MCP Server. Nothing to install.
stock_a_ttm_lyr 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 stock_a_ttm_lyr 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 stock_a_ttm_lyr. 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.
stock_a_ttm_lyr is provided by the China Stock MCP Server MCP server (peikuo/china-stock-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from China Stock MCP Server, 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.
351 China Stock MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.