Generic index constituent fetch (hs300/sz50/zz500).
AI agents call get_index_constituents to retrieve information from A Share 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 index constituent data—a straightforward read operation. There is no modification, deletion, code execution, or financial transaction involved. The blast radius of misuse is minimal, as incorrect queries only return data without causing harm.
From the tool's definition Tool name 'get_index_constituents' and description 'Generic index constituent fetch' indicate data retrieval. The phrase 'fetch' combined with context of fetching index constituents (hs300/sz50/zz500) describes a read-only query operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_index_constituents gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and A Share, and nothing reaches the server without passing your rules. This is the rule we recommend for get_index_constituents:
{
"version": "1",
"default": "deny",
"tools": {
"get_index_constituents": {}
}
}get_index_constituents is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Generic index constituent fetch (hs300/sz50/zz500). It is categorised as a Read tool in the A Share MCP Server, which means it retrieves data without modifying state.
Register the A Share MCP server in PolicyLayer and add a rule for get_index_constituents: 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 A Share. Nothing to install.
get_index_constituents 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_index_constituents 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_index_constituents. 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_index_constituents is provided by the A Share MCP server (shouldnotappearcalm/a-share-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from A Share, 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.
55 A Share tools catalogued and risk-classified — across an index of 43,000+ MCP servers.