Fetches daily time series data for a stock symbol.
AI agents call coreStock_daily to retrieve information from MCP Avantage without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical stock price data, which is a read-only operation with no side effects, no financial transactions, and no destructive actions. The blast radius of misuse is minimal—an agent could only access publicly available market data. While the server provides financial data, this specific tool does not move money, execute trades, or modify any system state.
From the tool's definition Tool name 'coreStock_daily' and description 'Fetches daily time series data for a stock symbol' indicate data retrieval with no modification or execution of trades/actions.
Attacks that exploit this kind of access
Fetches daily time series data for a stock symbol. It is categorised as a Read tool in the MCP Avantage MCP Server, which means it retrieves data without modifying state.
Register the MCP Avantage MCP server in PolicyLayer and add a rule for coreStock_daily: 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 MCP Avantage. Nothing to install.
coreStock_daily 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 coreStock_daily 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 coreStock_daily. 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.
coreStock_daily is provided by the MCP Avantage MCP server (missionsquad/mcp-avantage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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