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.

SERVERFinancial Modeling Prep (FMP) Server SOURCEimbenrabi/financial-modeling-prep-mcp-server

Low RISK CLASS

Category Read

Parameters 50 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/imbenrabi-financial-modeling-prep-mcp-server/getstandarddeviation.md

WHAT IT DOES

What getStandardDeviation does on Financial Modeling Prep (FMP) Server

AI agents call getStandardDeviation to retrieve information from Financial Modeling Prep (FMP) Server 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.

RISK

Why getStandardDeviation is rated Low

This tool retrieves and calculates a statistical measure (standard deviation) from existing market data. It performs read-only analysis on historical price information without creating, modifying, deleting, or executing any external operations. The calculation is deterministic based on input data and produces informational output only. No financial transactions, code execution, or data mutations occur.

From the tool's definition Tool name 'getStandardDeviation' and description 'Calculate the Standard Deviation for a stock using the FMP Standard Deviation API' indicates retrieval and computation of analytical metrics from historical price data with no modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs getStandardDeviation safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Financial Modeling Prep (FMP) Server , 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 Allowed

getStandardDeviation is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "getStandardDeviation": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Financial Modeling Prep (FMP) Server , apply this rule, and every getStandardDeviation call is checked against it from then on.

FAQ

Questions about getStandardDeviation

What does the getStandardDeviation tool do? +

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 (FMP) Server MCP Server, which means it retrieves data without modifying state.

What parameters does getStandardDeviation accept? +

getStandardDeviation accepts 5 parameters: to, from, symbol, timeframe, periodLength. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on getStandardDeviation? +

Register the Financial Modeling Prep (FMP) Server 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 (FMP) Server . Nothing to install.

What risk level is getStandardDeviation? +

getStandardDeviation is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit getStandardDeviation? +

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.

How do I block getStandardDeviation completely? +

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.

What MCP server provides getStandardDeviation? +

getStandardDeviation is provided by the Financial Modeling Prep (FMP) Server MCP server (imbenrabi/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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