Normalize common index codes to Baostock format.
AI agents call normalize_index_code 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.
The tool performs a read-only normalization or mapping operation converting index code formats. It retrieves or transforms existing data without creating, modifying, deleting, or executing external operations. This is consistent with the Read category (search, list, get, fetch operations).
From the tool's definition Tool name is 'normalize_index_code' and description states it 'Normalize common index codes to Baostock format' — this is a data transformation/lookup operation with no side effects.
Documented attack patterns abuse exactly the kind of access normalize_index_code 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 normalize_index_code:
{
"version": "1",
"default": "deny",
"tools": {
"normalize_index_code": {}
}
}normalize_index_code is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Normalize common index codes to Baostock format. 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 normalize_index_code: 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.
normalize_index_code 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 normalize_index_code 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 normalize_index_code. 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.
normalize_index_code 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.
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55 A Share tools catalogued and risk-classified — across an index of 43,000+ MCP servers.