# 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.

Agent View of the PolicyLayer registry record for `getStandardDeviation`. HTML page: https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getstandarddeviation

## Facts

- Tool: `getStandardDeviation`
- Server: Financial Modeling Prep (`cfocoder/financial-modeling-prep-mcp-server`) — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server.md
- Homepage: https://github.com/cfocoder/financial-modeling-prep-mcp-server
- Risk category: Read (Low risk)
- Registry record: grade D, identity unverified
- Server rate-limited: no
- Parameters: 5
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `to` | string | no | End date (YYYY-MM-DD) |
| `from` | string | no | Start date (YYYY-MM-DD) |
| `symbol` | string | no | Stock symbol |
| `timeframe` | string | no | Timeframe (1min, 5min, 15min, 30min, 1hour, 4hour, 1day) |
| `periodLength` | number | no | Period length for the indicator |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "getStandardDeviation",
    "arguments": {}
  }
}
```

## 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 own definition: "Tool name 'getStandardDeviation' and description 'Calculate the Standard Deviation for a stock using the FMP Standard Deviation API."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Financial Modeling Prep:

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

## Other tools on Financial Modeling Prep (252)

- `calculateCustomDCF` — Execute — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/calculatecustomdcf.md
- `calculateCustomLeveredDCF` — Execute — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/calculatecustomlevereddcf.md
- `getAcquisitionOwnership` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getacquisitionownership.md
- `getActivelyTradingList` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getactivelytradinglist.md
- `getADX` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getadx.md
- `getAftermarketQuote` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getaftermarketquote.md
- `getAftermarketTrade` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getaftermarkettrade.md
- `getAllExchangeMarketHours` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getallexchangemarkethours.md
- `getAllIndexQuotes` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getallindexquotes.md
- `getAllIndustryClassification` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getallindustryclassification.md
- `getAllShareFloat` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getallsharefloat.md
- `getAnalystEstimates` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getanalystestimates.md
- `getAvailableCountries` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getavailablecountries.md
- `getAvailableExchanges` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getavailableexchanges.md
- `getAvailableIndustries` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getavailableindustries.md
- `getAvailableSectors` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getavailablesectors.md
- `getAvailableTranscriptSymbols` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getavailabletranscriptsymbols.md
- `getBalanceSheetGrowthBulk` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbalancesheetgrowthbulk.md
- `getBalanceSheetStatement` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbalancesheetstatement.md
- `getBalanceSheetStatementAsReported` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbalancesheetstatementasreported.md
- `getBalanceSheetStatementGrowth` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbalancesheetstatementgrowth.md
- `getBalanceSheetStatementsBulk` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbalancesheetstatementsbulk.md
- `getBalanceSheetStatementTTM` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbalancesheetstatementttm.md
- `getBatchAftermarketQuote` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbatchaftermarketquote.md
- `getBatchAftermarketTrade` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbatchaftermarkettrade.md
- `getBatchMarketCap` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbatchmarketcap.md
- `getBatchQuotes` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbatchquotes.md
- `getBatchQuotesShort` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbatchquotesshort.md
- `getBiggestGainers` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbiggestgainers.md
- `getBiggestLosers` — Read — https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server/getbiggestlosers.md
- …and 222 more: https://policylayer.com/tools/cfocoder-financial-modeling-prep-mcp-server.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=cfocoder-financial-modeling-prep-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/cfocoder-financial-modeling-prep-mcp-server