get_stock_bars
AI agents call get_stock_bars to retrieve information from Alpaca MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries market data (stock bars/candlesticks) without modifying any state, executing transactions, or performing destructive operations. It is a read-only data retrieval function. While the server handles sensitive financial operations, this specific tool only accesses market information, making it a Read category risk.
From the tool's definition Tool name 'get_stock_bars' indicates retrieval of historical or real-time stock price bar data. The 'get_' prefix and 'bars' (OHLCV data) are characteristic of read-only data retrieval operations. Description is empty, lowering confidence slightly.
Attacks that exploit this kind of access
get_stock_bars. It is categorised as a Read tool in the Alpaca MCP Server MCP Server, which means it retrieves data without modifying state.
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.
get_stock_bars 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 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.
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.
get_stock_bars is provided by the Alpaca MCP Server MCP server (jbkix06/alpaca_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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