getWilliams
Calculate the Williams %R for a stock using the FMP Williams %R API. This tool helps users analyze overbought/oversold conditions and potential reversal signals based on historical price data.
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What getWilliams does on Financial Modeling Prep
AI agents call getWilliams 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 getWilliams is rated Low
Williams %R is a technical analysis indicator that derives values from historical price data without side effects. The tool retrieves or computes analytical metrics from market data—a read operation. There is no data modification, code execution, deletion, or financial action.
From the tool's definition Tool calculates and returns a technical indicator (Williams %R) based on historical price data. Words like 'Calculate' and 'analyze' indicate computation of existing data, not modification, execution of external operations, or financial transactions.
Attacks that exploit this kind of access
The rule that runs getWilliams 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 getWilliams, this is the rule to start with:
getWilliams 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 getWilliams call is checked against it from then on.
Questions about getWilliams
Calculate the Williams %R for a stock using the FMP Williams %R API. This tool helps users analyze overbought/oversold conditions and potential reversal signals based on 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.
getWilliams 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 getWilliams: 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.
getWilliams 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 getWilliams 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 getWilliams. 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.
getWilliams 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.
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