Stock-exchange holiday calendar. Pass exchange (default US); returns the list of upcoming market holidays with the date, holiday name, whether the session is a full close or an early close, and the trading hours when partial. Use it to plan around non-trading days. Data by Finnhub.
AI agents call markets.holiday 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 straightforward informational query tool that retrieves reference data (holiday calendars) from an external source (Finnhub) without side effects. It does not execute code, modify data, delete anything, or trigger financial transactions—it simply provides scheduling information for planning purposes.
From the tool's definition Tool returns a list of market holidays with dates and trading hours; no modification, deletion, or execution occurs. Description uses 'returns' indicating data retrieval only.
Attacks that exploit this kind of access
Stock-exchange holiday calendar. Pass exchange (default US); returns the list of upcoming market holidays with the date, holiday name, whether the session is a full close or an early close, and the trading hours when partial. Use it to plan around non-trading days. 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.holiday: 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.holiday 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.holiday 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.holiday. 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.holiday 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.
Teams ship this data inside their own products. See what a licence covers →