previous_trading_day

Get the previous trading day before the given date.

SERVERA-Share MCP Server SOURCE24mlight/a-share-mcp-is-just-i-need

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade A, identity unverified Pull the record →

This record as markdown: /tools/24mlight-a-share-mcp-is-just-i-need/previous-trading-day.md

WHAT IT DOES

What previous_trading_day does on A-Share MCP Server

AI agents call previous_trading_day to retrieve information from A-Share MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why previous_trading_day is rated Low

This tool fetches calendar/market data (the date of the previous trading day) based on an input parameter. It has no side effects, performs no state changes, and involves no financial transactions or code execution. It is a simple informational lookup, consistent with the Read category.

From the tool's definition Tool name 'previous_trading_day' and description 'Get the previous trading day before the given date' indicate a query operation that retrieves date information without modifying, executing code, deleting, or moving money.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs previous_trading_day safely

PolicyLayer is an MCP gateway: it sits between your AI agents and A-Share MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For previous_trading_day, this is the rule to start with:

previous_trading_day Allowed

previous_trading_day is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "previous_trading_day": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect A-Share MCP Server, apply this rule, and every previous_trading_day call is checked against it from then on.

FAQ

Questions about previous_trading_day

What does the previous_trading_day tool do? +

Get the previous trading day before the given date. It is categorised as a Read tool in the A-Share MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on previous_trading_day? +

Register the A-Share MCP Server MCP server in PolicyLayer and add a rule for previous_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 MCP Server. Nothing to install.

What risk level is previous_trading_day? +

previous_trading_day is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit previous_trading_day? +

Yes. Add a rate_limit block to the previous_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.

How do I block previous_trading_day completely? +

Set action: deny in the PolicyLayer policy for previous_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.

What MCP server provides previous_trading_day? +

previous_trading_day is provided by the A-Share MCP Server MCP server (24mlight/a-share-mcp-is-just-i-need). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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