market_hours

Gets current market hours and status.

SERVEROpen Stocks MCP SOURCEopen-agent-tools/open-stocks-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/open-agent-tools-open-stocks-mcp/market-hours.md

WHAT IT DOES

What market_hours does on Open Stocks MCP

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

RISK

Why market_hours is rated Low

This tool only retrieves static market status information. It does not create, modify, delete, execute external operations, or move money. Despite being on a financial trading server, the tool itself performs no financial transactions or irreversible actions. Classification as Read is appropriate, and severity is low because misuse poses minimal risk—an AI agent querying market hours cannot cause harm.

From the tool's definition Tool name 'market_hours' and description 'Gets current market hours and status' indicate a pure query operation that retrieves informational data about market operating times with no modifications, side effects, or external state changes.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs market_hours safely

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

market_hours Allowed

market_hours 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": {
    "market_hours": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Open Stocks MCP, apply this rule, and every market_hours call is checked against it from then on.

FAQ

Questions about market_hours

What does the market_hours tool do? +

Gets current market hours and status. It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on market_hours? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for market_hours: 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 Open Stocks MCP. Nothing to install.

What risk level is market_hours? +

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

Can I rate-limit market_hours? +

Yes. Add a rate_limit block to the market_hours 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 market_hours completely? +

Set action: deny in the PolicyLayer policy for market_hours. 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 market_hours? +

market_hours is provided by the Open Stocks MCP server (open-agent-tools/open-stocks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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