Fetch OHLCV aggregate bars from Polygon.io.
AI agents call polygon.aggregates to retrieve information from Mcp Financial Data without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical price and volume data from Polygon.io. The verb 'Fetch' and the nature of OHLCV aggregates (read-only market data) confirm this is a pure Read operation. There are no modifications, deletions, code executions, or financial transactions involved—only querying and retrieving public market data. Severity is low as misuse would only result in data retrieval, not harm.
From the tool's definition Tool name 'polygon.aggregates' and description 'Fetch OHLCV aggregate bars from Polygon.io' indicate a data retrieval operation. OHLCV (Open, High, Low, Close, Volume) bars are historical market data queries with no side effects.
Attacks that exploit this kind of access
Fetch OHLCV aggregate bars from Polygon.io. It is categorised as a Read tool in the Mcp Financial Data MCP Server, which means it retrieves data without modifying state.
Register the Mcp Financial Data MCP server in PolicyLayer and add a rule for polygon.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 Mcp Financial Data. Nothing to install.
polygon.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 polygon.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 polygon.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.
polygon.aggregates is provided by the Mcp Financial Data MCP server (sebaustin/mcp-financial-data). 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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