Estimate margin using Nubra's orders/v2/margin_required API. Use total_margin as the final required margin.
AI agents call get_margin 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 calculated margin requirements from the trading platform—a read-only operation with no side effects. It does not create, modify, delete, execute arbitrary operations, or move money. The margin estimate is informational data used for decision-making, not an action that changes system state. Severity is low because misuse (e.g., requesting margin on hypothetical positions) causes no real harm.
From the tool's definition Tool name 'get_margin' and description 'Estimate margin using Nubra's orders/v2/margin_required API' indicate retrieval of margin requirement data.
Attacks that exploit this kind of access
Estimate margin using Nubra's orders/v2/margin_required API. Use total_margin as the final required margin. 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_margin: 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_margin 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_margin 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_margin. 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_margin 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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