AI agents call xbrl_edgar_bulk_facts to retrieve information from Arelle without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite empty description, the naming convention and server context strongly indicate this tool retrieves bulk financial facts from SEC EDGAR filings. This is a read operation with no side effects—it queries and extracts data. Severity is medium because bulk financial data could inform investment decisions or competitive analysis if misused, but the tool itself performs no destructive or financial transactions.
From the tool's definition Tool name contains 'bulk_facts' and 'edgar' (SEC EDGAR). The arelle-mcp server description indicates tools for 'fact extraction' and 'SEC EDGAR integration'.
Attacks that exploit this kind of access
xbrl_edgar_bulk_facts. It is categorised as a Read tool in the Arelle MCP Server, which means it retrieves data without modifying state.
Register the Arelle MCP server in PolicyLayer and add a rule for xbrl_edgar_bulk_facts: 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 Arelle. Nothing to install.
xbrl_edgar_bulk_facts 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 xbrl_edgar_bulk_facts 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 xbrl_edgar_bulk_facts. 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.
xbrl_edgar_bulk_facts is provided by the Arelle MCP server (thekinghippopotamus/arelle-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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