AI agents call predict.orderbook to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves market data (order book information) without creating, modifying, deleting, or executing operations. The explicit 'read-only' designation confirms it has no side effects. While it relates to financial markets, it merely provides data retrieval rather than executing trades, moving funds, or committing financial obligations, placing it squarely in the Read category with low severity.
From the tool's definition Tool description explicitly states 'Read-only depth snapshot from Polymarket' and retrieves 'Full CLOB order book (bids + asks with price and size)' with no modification capability.
Attacks that exploit this kind of access
Full CLOB order book (bids + asks with price and size) for a Polymarket outcome token. Use the clobTokenIds from predict.markets. Read-only depth snapshot from Polymarket\. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for predict.orderbook: 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 Mcp. Nothing to install.
predict.orderbook 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 predict.orderbook 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 predict.orderbook. 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.
predict.orderbook is provided by the MCP server (@2sio/mcp). 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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