AI agents call stocks.insider-sentiment to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and aggregates historical financial data about insider trading sentiment. It performs a read-only query operation with no side effects, reversible changes, code execution, data destruction, or financial transactions.
From the tool's definition Tool description states it returns 'Aggregated insider sentiment for a US-listed company, by month' and 'net change in insider share holdings' — purely informational data retrieval with no modification, creation, deletion, or execution capabilities.
Attacks that exploit this kind of access
Aggregated insider sentiment for a US-listed company, by month. For each month returns the net change in insider share holdings and Finnhub\. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for stocks.insider-sentiment: 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. Nothing to install.
stocks.insider-sentiment 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 stocks.insider-sentiment 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 stocks.insider-sentiment. 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.
stocks.insider-sentiment is provided by the MCP server (@2sio/mcp). 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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