Rank symbols by return over a requested historical window.
AI agents call rank_symbols_by_return 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 and ranks financial data (historical returns) for analysis purposes. It performs no writes, deletes, trades, or executions—only a read/query operation on existing market data. The severity is low as misuse would merely return misleading ranking information without direct financial or operational consequences.
From the tool's definition Tool name 'rank_symbols_by_return' and description 'Rank symbols by return over a requested historical window' indicate data retrieval and analysis without modification or execution of trades. The action is purely querying historical performance data.
Attacks that exploit this kind of access
Rank symbols by return over a requested historical window. 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 rank_symbols_by_return: 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.
rank_symbols_by_return 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 rank_symbols_by_return 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 rank_symbols_by_return. 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.
rank_symbols_by_return 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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