Normalize a stock code to Baostock format.
AI agents call normalize_stock_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.
This tool performs a stateless string normalization operation. It takes a stock code as input and returns a standardized format. There are no side effects, no data retrieval beyond simple format mapping, no modifications to any system state, and no code execution. It aligns with the Read category as a utility function that processes and returns data without side effects.
From the tool's definition Tool name 'normalize_stock_code' and description 'Normalize a stock code to Baostock format' indicate a data transformation/lookup utility that converts stock code formats without retrieving, modifying, or executing operations on external systems.
Documented attack patterns abuse exactly the kind of access normalize_stock_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_stock_code:
{
"version": "1",
"default": "deny",
"tools": {
"normalize_stock_code": {}
}
}normalize_stock_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 a stock code 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_stock_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_stock_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_stock_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_stock_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_stock_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.
Free to start. No card required.
55 A Share tools catalogued and risk-classified — across an index of 43,000+ MCP servers.