AI agents call business.lei-isins 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 financial security identifier relationships from a public, read-only dataset. It has no side effects, does not execute code, does not modify data, and does not move funds. While the data relates to financial instruments, the tool itself merely maps identifiers without creating financial obligations or transactions.
From the tool's definition Tool description states it performs ISIN ↔ LEI mapping to 'list' and 'resolve' identifiers—pure data retrieval with no modification or execution. The verbs 'list' and 'resolve' indicate lookup operations against a public reference database (GLEIF).
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
ISIN ↔ LEI mapping (GLEIF, live, CC0). Two modes: pass lei to list every ISIN (security identifier) issued by that entity; or pass isin to resolve the issuer\. 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 business.lei-isins: 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.
business.lei-isins 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 business.lei-isins 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 business.lei-isins. 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.
business.lei-isins 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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