set_grid_size · Ice Puzzle MCP: Risk & Policy

WHAT IT DOES

What set_grid_size does on Ice Puzzle

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

WHY IT NEEDS A POLICY

Why set_grid_size needs a policy

This is a Write operation because it modifies the level's grid dimensions and removes elements that fall outside the new bounds. While the removal is irreversible in terms of the current design, it is part of a reversible edit cycle (levels are drafts before publishing). The severity is high because careless use (e.g., shrinking without warning) can result in significant loss of level design work.

From the tool's definition Tool resizes the level grid and removes elements outside new bounds—modifying level dimensions and content irreversibly within the edit session. Description: 'Resize the level grid. Elements outside new bounds are removed.'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_grid_size Rate-limited

set_grid_size 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": {
    "set_grid_size": {
      "limits": [
        {
          "counter": "set_grid_size_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about set_grid_size

What does the set_grid_size tool do? +

Resize the level grid. Elements outside new bounds are removed. It is categorised as a Write tool in the Ice Puzzle MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_grid_size? +

Register the Ice Puzzle MCP server in PolicyLayer and add a rule for set_grid_size: 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 Ice Puzzle. Nothing to install.

What risk level is set_grid_size? +

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

Can I rate-limit set_grid_size? +

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

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

set_grid_size is provided by the Ice Puzzle MCP server (wmoten/ice-puzzle-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.