tiger_set_default_data_account

THE RISK

Medium Risk

Why tiger_set_default_data_account needs a policy

This tool modifies account state (setting a default data account) reversibly—it changes a configuration preference rather than executing trades or deleting data. While it operates within a financial trading platform, the action itself is a configuration Write, not a Financial transaction (no money moves).

From the tool's definition Tool name 'tiger_set_default_data_account' indicates modification of account settings. Context: server provides 'portfolio management' and integrates with Tiger Brokers API for trading.

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

POLICY

How to control tiger_set_default_data_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_data_account:

policy.json

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

tiger_set_default_data_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

More Tiger MCP tools

Financial tiger_place_order tiger_place_order Financial tiger_modify_order tiger_modify_order Destructive tiger_cancel_order tiger_cancel_order Destructive tiger_remove_account tiger_remove_account Write tiger_add_account tiger_add_account Write tiger_set_default_trading_account tiger_set_default_trading_account Read tiger_get_account_info tiger_get_account_info Read tiger_get_account_status tiger_get_account_status

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_data_account

What does the tiger_set_default_data_account tool do? +

tiger_set_default_data_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_data_account? +

Register the Tiger MCP server in PolicyLayer and add a rule for tiger_set_default_data_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_data_account? +

tiger_set_default_data_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_data_account? +

Yes. Add a rate_limit block to the tiger_set_default_data_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_data_account completely? +

Set action: deny in the PolicyLayer policy for tiger_set_default_data_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_data_account? +

tiger_set_default_data_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 →