AI agents call xbrl_financial_ratios 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.
Financial ratio calculation is fundamentally a read operation that derives metrics from existing filing data without creating, modifying, or deleting records. While the description is missing (reducing confidence slightly), the tool name and pattern of sibling tools on an analysis-focused server make it clear this retrieves computed financial information rather than executing arbitrary code, modifying data, or…
From the tool's definition Tool name 'xbrl_financial_ratios' suggests calculation and retrieval of financial metrics from XBRL filings.
Attacks that exploit this kind of access
xbrl_financial_ratios. 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_financial_ratios: 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_financial_ratios 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_financial_ratios 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_financial_ratios. 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_financial_ratios 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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