create_new_sketch · Arduino MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_new_sketch does on Arduino MCP Server

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

WHY IT NEEDS A POLICY

Why create_new_sketch needs a policy

Creating a new sketch file is a reversible Write operation—it adds a file to the filesystem but does not execute code, delete existing data, or cause irreversible changes. Severity is medium because an agent could create malformed or unwanted sketch files, consuming resources or polluting the project, but the action is undoable via file deletion.

From the tool's definition Tool name 'create_new_sketch' indicates creation of a new Arduino sketch file; description is empty but context from sibling tools (compile_sketch, lint_arduino_project) confirms this server manages Arduino project files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_new_sketch Rate-limited

create_new_sketch 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_new_sketch": {
      "limits": [
        {
          "counter": "create_new_sketch_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 Arduino MCP Server, so you can run agents against it safely.

FAQ

Questions about create_new_sketch

What does the create_new_sketch tool do? +

create_new_sketch. It is categorised as a Write tool in the Arduino MCP Server 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_new_sketch? +

Register the Arduino MCP Server MCP server in PolicyLayer and add a rule for create_new_sketch: 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 Arduino MCP Server. Nothing to install.

What risk level is create_new_sketch? +

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

Can I rate-limit create_new_sketch? +

Yes. Add a rate_limit block to the create_new_sketch 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_new_sketch completely? +

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

create_new_sketch is provided by the Arduino MCP Server MCP server (niradler/arduino-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.