get_stock_bars

A read tool on the Alpaca MCP server.

SERVERAlpaca MCP Server SOURCEcliffsgpt/alpaca-mcp-clone

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/cliffsgpt-alpaca-mcp-clone/get-stock-bars.md

WHAT IT DOES

What get_stock_bars does on Alpaca MCP Server

AI agents call get_stock_bars to retrieve information from Alpaca MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_stock_bars is rated Low

This tool retrieves stock market data (price bars/candles) which is informational and read-only. It has no capability to modify, delete, or execute trades. Even in the context of a financial trading server, querying historical or real-time market data poses minimal risk compared to actual trading operations. The blast radius of misuse is limited to accessing publicly available market information.

From the tool's definition Tool name 'get_stock_bars' indicates retrieval of historical stock price data (OHLCV bars). The Alpaca Trading API context shows this is a market data query function.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_stock_bars safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Alpaca MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_stock_bars, this is the rule to start with:

get_stock_bars Allowed

get_stock_bars 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": {
    "get_stock_bars": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Alpaca MCP Server, apply this rule, and every get_stock_bars call is checked against it from then on.

FAQ

Questions about get_stock_bars

What does the get_stock_bars tool do? +

get_stock_bars is a read tool on the Alpaca MCP Server MCP server. It is categorised as a Read tool in the Alpaca MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_stock_bars? +

Register the Alpaca MCP Server MCP server in PolicyLayer and add a rule for get_stock_bars: 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 Alpaca MCP Server. Nothing to install.

What risk level is get_stock_bars? +

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

Can I rate-limit get_stock_bars? +

Yes. Add a rate_limit block to the get_stock_bars 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 get_stock_bars completely? +

Set action: deny in the PolicyLayer policy for get_stock_bars. 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 get_stock_bars? +

get_stock_bars is provided by the Alpaca MCP Server MCP server (cliffsgpt/alpaca-mcp-clone). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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