tiger_set_default_trading_account

THE RISK

Medium Risk

Why tiger_set_default_trading_account needs a policy

This tool modifies user account configuration (which account is designated as default) but does not execute trades, delete data, or move money directly. The effect is reversible—the default can be changed again.

From the tool's definition Tool name contains 'set_default' which indicates modification of account settings. Server context shows this is a Tiger Brokers trading platform with order execution capabilities. Setting a default trading account is a reversible configuration change.

Documented attack patterns abuse exactly the kind of access tiger_set_default_trading_account gives an agent:

POLICY

How to control tiger_set_default_trading_account

PolicyLayer is an MCP gateway — it sits between your AI agents and Tiger MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for tiger_set_default_trading_account:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "tiger_set_default_trading_account": {
      "limits": [
        {
          "counter": "tiger_set_default_trading_account_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

tiger_set_default_trading_account stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Tiger MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 23 Tiger MCP tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about tiger_set_default_trading_account

What does the tiger_set_default_trading_account tool do? +

tiger_set_default_trading_account. It is categorised as a Write tool in the Tiger MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tiger_set_default_trading_account? +

Register the Tiger MCP server in PolicyLayer and add a rule for tiger_set_default_trading_account: 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 Tiger MCP. Nothing to install.

What risk level is tiger_set_default_trading_account? +

tiger_set_default_trading_account is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit tiger_set_default_trading_account? +

Yes. Add a rate_limit block to the tiger_set_default_trading_account 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.

How do I block tiger_set_default_trading_account completely? +

Set action: deny in the PolicyLayer policy for tiger_set_default_trading_account. 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.

What MCP server provides tiger_set_default_trading_account? +

tiger_set_default_trading_account is provided by the Tiger MCP server (luxiaolei/tiger-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tiger MCP tool call.

Start from Tiger MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →