Get the current account balance and basic account information
AI agents call get_account_balance 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 creating, modifying, deleting, or executing any operations. It is a read-only query operation that returns account balance and basic details. Even though the context involves financial trading, the tool itself performs no financial transactions or state changes—it only queries existing data. Therefore, it is categorized as Read with low severity.
From the tool's definition Tool name 'get_account_balance' and description 'Get the current account balance and basic account information' indicate data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_account_balance 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 get_account_balance:
{
"version": "1",
"default": "deny",
"tools": {
"get_account_balance": {}
}
}get_account_balance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the current account balance and basic account information. 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 get_account_balance: 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.
get_account_balance 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 get_account_balance 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 get_account_balance. 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.
get_account_balance 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.