Access historical market capitalization data for a company using the FMP Historical Market Capitalization API. This API helps track the changes in market value over time, enabling long-term assessments of a company
AI agents call getHistoricalMarketCap to retrieve information from Financial Modeling Prep 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 and queries historical financial data (market capitalization values) for analysis purposes. It has no side effects, does not modify data, execute commands, delete records, or move money. The action is purely informational and read-only, consistent with the 'Read' category definition of retrieving or querying data without side effects.
From the tool's definition Tool name 'getHistoricalMarketCap' and description 'Access historical market capitalization data' and 'track the changes in market value over time' indicate data retrieval with no modification or execution of operations.
Attacks that exploit this kind of access
Access historical market capitalization data for a company using the FMP Historical Market Capitalization API. This API helps track the changes in market value over time, enabling long-term assessments of a company. It is categorised as a Read tool in the Financial Modeling Prep MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Financial Modeling Prep MCP Server MCP server in PolicyLayer and add a rule for getHistoricalMarketCap: 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 Financial Modeling Prep MCP Server. Nothing to install.
getHistoricalMarketCap 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 getHistoricalMarketCap 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 getHistoricalMarketCap. 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.
getHistoricalMarketCap is provided by the Financial Modeling Prep MCP Server MCP server (vijitdaroch/financial-modeling-prep-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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