Get order book (bids and asks) for a symbol. Weight varies by limit: 5 (1-100), 25 (101-500), 50 (501-1000), 250 (1001-5000).
AI agents call bn_order_book to retrieve information from Node2flow/binance without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a pure data retrieval operation with no side effects. It queries publicly available market data from the Binance exchange without creating, modifying, deleting, or executing any actions. The weight parameters reflect query complexity, not data modification. Risk is minimal as the tool cannot affect trading state, positions, or financial commitments.
From the tool's definition Tool retrieves order book data (bids and asks) for a symbol with no modification capability. Description explicitly states 'Get order book' with only read-based weight parameters indicating API rate limiting for queries.
Attacks that exploit this kind of access
Get order book (bids and asks) for a symbol. Weight varies by limit: 5 (1-100), 25 (101-500), 50 (501-1000), 250 (1001-5000). It is categorised as a Read tool in the Node2flow/binance MCP Server, which means it retrieves data without modifying state.
Register the Node2flow/binance MCP server in PolicyLayer and add a rule for bn_order_book: 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 Node2flow/binance. Nothing to install.
bn_order_book 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 bn_order_book 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 bn_order_book. 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.
bn_order_book is provided by the Node2flow/binance MCP server (node2flow-th/binance-mcp-community). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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