resize_nodes · AI Charts MCP: Risk & Policy

WHAT IT DOES

What resize_nodes does on AI Charts

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

WHY IT NEEDS A POLICY

Why resize_nodes needs a policy

This tool creates or modifies diagram element properties in a reversible manner. Resizing is a standard diagram editing operation that can be undone (either by resizing again or resetting to auto-size via null). It does not delete, execute commands, move money, or trigger external operations—it simply adjusts visual presentation attributes of existing diagram nodes. This fits the Write category.

From the tool's definition Tool description: 'Resize one or more nodes. Pass null for width/height to reset to auto-size.' The action modifies diagram node properties (width/height dimensions) reversibly without deleting data or executing external code.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

resize_nodes Rate-limited

resize_nodes 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": {
    "resize_nodes": {
      "limits": [
        {
          "counter": "resize_nodes_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 AI Charts, so you can run agents against it safely.

FAQ

Questions about resize_nodes

What does the resize_nodes tool do? +

Resize one or more nodes. Pass null for width/height to reset to auto-size. It is categorised as a Write tool in the AI Charts MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on resize_nodes? +

Register the AI Charts MCP server in PolicyLayer and add a rule for resize_nodes: 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 AI Charts. Nothing to install.

What risk level is resize_nodes? +

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

Can I rate-limit resize_nodes? +

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

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

resize_nodes is provided by the AI Charts MCP server (tjameswilliams/ai-charts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.