design_block · Mcp Garendesign MCP: Risk & Policy

WHAT IT DOES

What design_block does on Mcp Garendesign

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

WHY IT NEEDS A POLICY

Why design_block needs a policy

This tool generates/creates design artifacts for a specific UI block as part of a multi-stage design workflow. It produces output (component designs, code structures) rather than just reading existing data. No indication of irreversible deletion, financial operations, or arbitrary code execution. Classified as Write since it creates design artifacts that can presumably be revised or regenerated.

From the tool's definition 'Design a specific block' and 'detailed component design' — creates or generates component design artifacts

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

design_block Rate-limited

design_block 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": {
    "design_block": {
      "limits": [
        {
          "counter": "design_block_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 Mcp Garendesign, so you can run agents against it safely.

FAQ

Questions about design_block

What does the design_block tool do? +

Design a specific block. This is the second-stage tool in the block-based design strategy for detailed component design. It is categorised as a Write tool in the Mcp Garendesign MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on design_block? +

Register the Mcp Garendesign MCP server in PolicyLayer and add a rule for design_block: 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 Mcp Garendesign. Nothing to install.

What risk level is design_block? +

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

Can I rate-limit design_block? +

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

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

design_block is provided by the Mcp Garendesign MCP server (lyw405/mcp-garendesign). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.