blackjack-double

THE RISK

Low Risk

Why blackjack-double needs a policy

This tool performs an in-game blackjack action (doubling down) within a simulated/interactive game environment. It does not move real money, modify persistent data outside the game session, execute system commands, or delete anything. The 'bet' is virtual game state, not a real financial transaction.

From the tool's definition Double down on a hand - double the bet and receive exactly one more card

Documented attack patterns abuse exactly the kind of access blackjack-double gives an agent:

POLICY

How to control blackjack-double

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "blackjack-double": {
      "limits": [
        {
          "counter": "blackjack-double_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

blackjack-double gets a rate cap, and everything else on the server is denied unless you say otherwise.

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

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Blackjack MCP Server tools

Execute blackjack-hit Request another card for the specified hand in a blackjack game Execute blackjack-split Split a pair into two separate hands (when dealt two cards of the same value) Execute blackjack-stand Stand with the current hand total in a blackjack game Write blackjack-new-game Create a new blackjack game Other blackjack-decline-insurance Decline insurance when dealer shows an Ace Read blackjack-get-state Get the current state of a blackjack game Other blackjack-take-insurance Take insurance when dealer shows an Ace (side bet against dealer blackjack)

All 8 Blackjack MCP Server tools →

Other tools on other servers

Android Forensics ADB MCP Server generate_app_analysis_report Ethereum Tools add Math MCP Server complex_analysis_suite Crypto_MCP aes_encrypt

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about blackjack-double

What does the blackjack-double tool do? +

Double down on a hand - double the bet and receive exactly one more card. It is categorised as a Other tool in the Blackjack MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on blackjack-double? +

Register the Blackjack MCP Server MCP server in PolicyLayer and add a rule for blackjack-double: 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 Blackjack MCP Server. Nothing to install.

What risk level is blackjack-double? +

blackjack-double is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit blackjack-double? +

Yes. Add a rate_limit block to the blackjack-double 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 blackjack-double completely? +

Set action: deny in the PolicyLayer policy for blackjack-double. 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 blackjack-double? +

blackjack-double is provided by the Blackjack MCP Server MCP server (nanobot-ai/blackjack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Blackjack MCP Server tool call.

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

CHECK YOUR STACK →