Get aggregate bars for a ticker
AI agents call get_aggregates 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 queries historical or current market data aggregates without any side effects. It does not create, modify, delete data, execute code, or involve financial transactions. The blast radius of misuse is minimal—worst case is excessive API calls or information disclosure of publicly available market data. Classified as Read with low severity.
From the tool's definition Tool retrieves aggregate bars (OHLC data) for a ticker from Polygon.io API. Description states 'Get aggregate bars' with no modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Get aggregate bars for a ticker. 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_aggregates: 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_aggregates 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_aggregates 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_aggregates. 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_aggregates 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.
get_aggregates is one line of Polygon MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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