getStandardDeviation
Calculate the Standard Deviation for a stock using the FMP Standard Deviation API. This tool helps users analyze volatility and risk associated with historical price data.
This record as markdown: /tools/cfocoder-financial-modeling-prep-mcp-server/getstandarddeviation.md
What getStandardDeviation does on Financial Modeling Prep
AI agents call getStandardDeviation to retrieve information from Financial Modeling Prep without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
to | string | — | End date (YYYY-MM-DD) |
from | string | — | Start date (YYYY-MM-DD) |
symbol | string | — | Stock symbol |
timeframe | string | — | Timeframe (1min, 5min, 15min, 30min, 1hour, 4hour, 1day) |
periodLength | number | — | Period length for the indicator |
Parameters from the server's own tool schema.
Why getStandardDeviation is rated Low
This tool retrieves and calculates a statistical metric (standard deviation) from historical price data. It is purely analytical with no ability to modify data, execute code, trigger external operations, delete information, or commit financial transactions. The output is a read-only analysis result used for research purposes. This is a typical Read category financial data analysis tool.
From the tool's definition Tool name 'getStandardDeviation' and description 'Calculate the Standard Deviation for a stock using the FMP Standard Deviation API.
Attacks that exploit this kind of access
The rule that runs getStandardDeviation safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Financial Modeling Prep, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For getStandardDeviation, this is the rule to start with:
getStandardDeviation is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Financial Modeling Prep, apply this rule, and every getStandardDeviation call is checked against it from then on.
Questions about getStandardDeviation
Calculate the Standard Deviation for a stock using the FMP Standard Deviation API. This tool helps users analyze volatility and risk associated with historical price data. It is categorised as a Read tool in the Financial Modeling Prep MCP Server, which means it retrieves data without modifying state.
getStandardDeviation accepts 5 parameters: to, from, symbol, timeframe, periodLength. The full parameter table on this page comes from the server's own tool schema.
Register the Financial Modeling Prep MCP server in PolicyLayer and add a rule for getStandardDeviation: 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. Nothing to install.
getStandardDeviation 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 getStandardDeviation 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 getStandardDeviation. 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.
getStandardDeviation is provided by the Financial Modeling Prep MCP server (cfocoder/financial-modeling-prep-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on Financial Modeling Prep, and thousands of servers like it.
This server
Across the catalogue