place_market_order_tool
AI agents use place_market_order_tool to commit financial operations through Alpaca MCP Gold Standard — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Despite the empty description, the tool name unambiguously indicates it places market orders on a trading platform. Placing market orders directly commits financial obligations by buying or selling securities at current market prices. This is irreversible once executed and can result in significant financial impact, warranting a critical severity rating.
From the tool's definition Tool name 'place_market_order_tool' on a server described as providing 'order execution' capabilities for 'professional trading operations with Alpaca'
Attacks that exploit this kind of access
place_market_order_tool. It is categorised as a Financial tool in the Alpaca MCP Gold Standard MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Alpaca MCP Gold Standard MCP server in PolicyLayer and add a rule for place_market_order_tool: 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 Alpaca MCP Gold Standard. Nothing to install.
place_market_order_tool is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the place_market_order_tool 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 place_market_order_tool. 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.
place_market_order_tool is provided by the Alpaca MCP Gold Standard MCP server (joravetz/alpaca-mcp-gold). 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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