update_qrcode · QR Forge MCP server MCP: Risk & Policy

WHAT IT DOES

What update_qrcode does on QR Forge MCP server

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

WHY IT NEEDS A POLICY

Why update_qrcode needs a policy

The tool modifies existing QR code resources (updating mutable fields) in a reversible manner. This is a Write operation since updates can be undone by making subsequent updates. There is no irreversible deletion (Destructive), code execution (Execute), or financial impact (Financial).

From the tool's definition Tool name is 'update_qrcode' and description states 'Update a QR code's mutable fields.' This explicitly indicates modification of existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_qrcode Rate-limited

update_qrcode 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": {
    "update_qrcode": {
      "limits": [
        {
          "counter": "update_qrcode_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 QR Forge MCP server, so you can run agents against it safely.

FAQ

Questions about update_qrcode

What does the update_qrcode tool do? +

Update a QR code's mutable fields. Only fields valid for the QR's type. It is categorised as a Write tool in the QR Forge 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 update_qrcode? +

Register the QR Forge MCP server MCP server in PolicyLayer and add a rule for update_qrcode: 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 QR Forge MCP server. Nothing to install.

What risk level is update_qrcode? +

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

Can I rate-limit update_qrcode? +

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

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

update_qrcode is provided by the QR Forge MCP server MCP server (jkolarov/qrforge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.