Is a stock exchange open right now? Pass exchange (default US); returns whether trading is open, the current session (pre-market, regular, post-market, or closed), whether today is a market holiday, the exchange timezone, and the server timestamp. Use it to gate time-sensitive logic to market hou...
AI agents call markets.status to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only query tool that retrieves current market state from Finnhub. It gathers information to inform decisions but performs no transactions, executes no code, modifies no data, and incurs no financial obligations itself.
From the tool's definition Tool returns market status information (whether trading is open, current session type, market holiday status, timezone, timestamp). Uses verbs like 'returns' and 'Pass' indicating data retrieval only.
Attacks that exploit this kind of access
Is a stock exchange open right now? Pass exchange (default US); returns whether trading is open, the current session (pre-market, regular, post-market, or closed), whether today is a market holiday, the exchange timezone, and the server timestamp. Use it to gate time-sensitive logic to market hours. Data by Finnhub. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for markets.status: 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 Mcp. Nothing to install.
markets.status 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 markets.status 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 markets.status. 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.
markets.status is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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