AI agents call stocks.screener 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.
stocks.screener is a querying and filtering tool that retrieves public SEC financial data to support stock analysis. It does not create, modify, delete, execute external operations, or move money. This is a straightforward Read operation with low severity since misuse would only result in inappropriate data queries, not financial transactions or data destruction.
From the tool's definition Tool filters and sorts stock data from SEC XBRL filings by fundamental concepts and ratios—a retrieval operation with no modification of data or side effects.
Attacks that exploit this kind of access
Fundamental stock screener over SEC XBRL frames: filter/sort all filers by a concept (or a ratio of two concepts) for a period. 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.screener: 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.screener 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.screener 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.screener. 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.screener 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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