Measure single-name concentration and HHI concentration risk across the current portfolio snapshot.
AI agents call get_portfolio_concentration_risk to retrieve information from Nubra MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves portfolio metrics (concentration indices, HHI) from a snapshot of the current state. It performs analytical calculations on data but does not create, modify, delete, or trigger financial transactions. The action is informational and read-only, carrying minimal risk even if misused by an agent, as it cannot alter portfolio holdings or execute trades.
From the tool's definition Tool description states it 'Measure[s]' concentration risk across 'the current portfolio snapshot' — a query operation that retrieves and analyzes existing portfolio data without modification, deletion, or execution of external systems.
Attacks that exploit this kind of access
Measure single-name concentration and HHI concentration risk across the current portfolio snapshot. It is categorised as a Read tool in the Nubra MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Nubra MCP Server MCP server in PolicyLayer and add a rule for get_portfolio_concentration_risk: 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 Nubra MCP Server. Nothing to install.
get_portfolio_concentration_risk 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_portfolio_concentration_risk 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_portfolio_concentration_risk. 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_portfolio_concentration_risk is provided by the Nubra MCP Server MCP server (socials-zanskar/nubra-mcp-server). 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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