Get year-to-date and historical returns for a specific fund.
AI agents call get_fund_returns to retrieve information from Northern Trust MCP Layer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical financial data (fund returns) without creating, modifying, deleting, or executing any operations. It is a read-only query operation that returns already-computed metrics. While the server operates in a financial domain, this specific tool does not move money, commit financial obligations, or trigger trades—it only surfaces existing performance information.
From the tool's definition Tool name 'get_fund_returns' and description 'Get year-to-date and historical returns for a specific fund' indicate retrieval of fund performance data with no modification or execution of commands.
Attacks that exploit this kind of access
Get year-to-date and historical returns for a specific fund. It is categorised as a Read tool in the Northern Trust MCP Layer MCP Server, which means it retrieves data without modifying state.
Register the Northern Trust MCP Layer MCP server in PolicyLayer and add a rule for get_fund_returns: 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 Northern Trust MCP Layer. Nothing to install.
get_fund_returns 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 get_fund_returns 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 get_fund_returns. 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.
get_fund_returns is provided by the Northern Trust MCP Layer MCP server (vbzvibin/mcp_v3). 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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