Get the next trading day after the given date.
AI agents call next_trading_day 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 informational data (the next trading day date) based on an input parameter. It performs no side effects, does not modify data, does not execute code or commands, and does not involve financial transactions. It is purely a read/lookup operation on trading calendar reference data.
From the tool's definition Tool name 'next_trading_day' and description 'Get the next trading day after the given date' indicates a query operation that retrieves calendar/reference data without modifying, executing external operations, or affecting system state.
Documented attack patterns abuse exactly the kind of access next_trading_day 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 next_trading_day:
{
"version": "1",
"default": "deny",
"tools": {
"next_trading_day": {}
}
}next_trading_day is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the next trading day after the given date. 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 next_trading_day: 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.
next_trading_day 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 next_trading_day 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 next_trading_day. 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.
next_trading_day 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.