arch_generate_diagram

Generate architecture diagram markup (Mermaid or PlantUML) from project analysis

SERVERPlugin Hub SOURCE@barnburner121/plugin-hub-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/barnburner121-plugin-hub-mcp/arch-generate-diagram.md

WHAT IT DOES

What arch_generate_diagram does on Plugin Hub

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

RISK

Why arch_generate_diagram is rated Medium

An AI agent can call arch_generate_diagram faster than any human can review: one bad instruction and it creates or modifies resources in Plugin Hub by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs arch_generate_diagram safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Plugin Hub, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For arch_generate_diagram, this is the rule to start with:

arch_generate_diagram Rate-limited

arch_generate_diagram 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": {
    "arch_generate_diagram": {
      "limits": [
        {
          "counter": "arch_generate_diagram_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Plugin Hub, apply this rule, and every arch_generate_diagram call is checked against it from then on.

FAQ

Questions about arch_generate_diagram

What does the arch_generate_diagram tool do? +

Generate architecture diagram markup (Mermaid or PlantUML) from project analysis. It is categorised as a Write tool in the Plugin Hub MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on arch_generate_diagram? +

Register the Plugin Hub MCP server in PolicyLayer and add a rule for arch_generate_diagram: 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 Plugin Hub. Nothing to install.

What risk level is arch_generate_diagram? +

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

Can I rate-limit arch_generate_diagram? +

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

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

arch_generate_diagram is provided by the Plugin Hub MCP server (@barnburner121/plugin-hub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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