Get comprehensive account details including buying power and cash balances
AI agents call account_details to retrieve information from Open Paper Trading MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves account information without modifying state, executing code, or triggering financial transactions. Although the server provides trading capabilities, this specific tool is purely informational. The severity is low because account details are typically sensitive but reading them poses minimal risk compared to actual trades or deletions.
From the tool's definition Tool description states 'Get comprehensive account details' — a retrieval operation with no modification or side effects. The verb 'Get' and the context of querying account metrics (buying power, cash balances) are characteristic of Read operations.
Documented attack patterns abuse exactly the kind of access account_details gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Open Paper Trading MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for account_details:
{
"version": "1",
"default": "deny",
"tools": {
"account_details": {}
}
}account_details is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get comprehensive account details including buying power and cash balances. It is categorised as a Read tool in the Open Paper Trading MCP MCP Server, which means it retrieves data without modifying state.
Register the Open Paper Trading MCP server in PolicyLayer and add a rule for account_details: 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 Open Paper Trading MCP. Nothing to install.
account_details 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 account_details 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 account_details. 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.
account_details is provided by the Open Paper Trading MCP server (open-agent-tools/open-paper-trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Open Paper Trading MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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44 Open Paper Trading MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.