Find symbols whose current price is near high-open-interest call or put walls in the option chain.
AI agents call find_oi_walls 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 analyzes existing options data (open-interest levels) to identify price relationships. It performs no write operations, does not execute orders, does not delete data, and does not commit financial transactions. It is purely informational analysis of market structure, classifying it as a Read operation with low risk of misuse even if called by an AI agent.
From the tool's definition Tool description states it 'finds' symbols and queries option chain data for open-interest walls — a pure data retrieval operation with no modification, deletion, or execution of trades.
Attacks that exploit this kind of access
Find symbols whose current price is near high-open-interest call or put walls in the option chain. 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 find_oi_walls: 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.
find_oi_walls 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 find_oi_walls 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 find_oi_walls. 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.
find_oi_walls 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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