create_puzzle · Unicode Puzzles MCP: Risk & Policy

WHAT IT DOES

What create_puzzle does on Unicode Puzzles MCP

AI agents use create_puzzle to create or update resources in Unicode Puzzles MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unicode Puzzles MCP environment.

WHY IT NEEDS A POLICY

Why create_puzzle needs a policy

The tool creates and stores puzzle objects using Unicode steganography techniques. This is a reversible write operation—puzzles can be modified, deleted, or replaced without permanent damage. There is no evidence of code execution, data destruction, or financial impact. The worst realistic misuse would be creating misleading or spam puzzles, which has limited blast radius.

From the tool's definition Tool name 'create_puzzle' and description 'Create a Unicode steganography puzzle' indicate creation of new data structures (puzzles). The sibling tools 'encode_message' and 'decode_message' confirm this is a data creation and manipulation suite.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_puzzle Rate-limited

create_puzzle 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Unicode Puzzles MCP, so you can run agents against it safely.

FAQ

Questions about create_puzzle

What does the create_puzzle tool do? +

Create a Unicode steganography puzzle. It is categorised as a Write tool in the Unicode Puzzles 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 create_puzzle? +

Register the Unicode Puzzles MCP server in PolicyLayer and add a rule for create_puzzle: 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 Unicode Puzzles MCP. Nothing to install.

What risk level is create_puzzle? +

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

Can I rate-limit create_puzzle? +

Yes. Add a rate_limit block to the create_puzzle 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 create_puzzle completely? +

Set action: deny in the PolicyLayer policy for create_puzzle. 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 create_puzzle? +

create_puzzle is provided by the Unicode Puzzles MCP server (vetcoders/unicode-puzzles-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.