Get daily open/close prices
AI agents call get_daily_open_close to retrieve information from Polygon MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves financial market data (daily open/close prices) without creating, modifying, deleting, executing code, or initiating financial transactions. It is a read-only query operation against market data APIs. The severity is low because misuse results only in data access, not financial loss or system compromise.
From the tool's definition Tool name 'get_daily_open_close' and description 'Get daily open/close prices' indicate retrieval of historical market data with no modification or execution capability.
Attacks that exploit this kind of access
Get daily open/close prices. It is categorised as a Read tool in the Polygon MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Polygon MCP Server MCP server in PolicyLayer and add a rule for get_daily_open_close: 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 Polygon MCP Server. Nothing to install.
get_daily_open_close 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 get_daily_open_close 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 get_daily_open_close. 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.
get_daily_open_close is provided by the Polygon MCP Server MCP server (jwaresolutions/polygon-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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