generate_flow_diagram

THE RISK

Medium Risk

Why generate_flow_diagram needs a policy

This tool generates SVG chart output, which is a form of creating/producing data. While the output is a visual diagram, it is reversible (charts can be deleted or regenerated), has no side effects beyond the chart's creation, and does not execute arbitrary code, delete data, or involve financial operations. The low severity reflects that misuse would only result in unwanted chart generation with minimal blast radius.

From the tool's definition The tool description states it will 'Generate a flow diagram chart', which creates an SVG artifact. The function name prefix 'generate_' and the context of an offline chart generation server confirm this tool creates (writes) new data in the form of visual…

Documented attack patterns abuse exactly the kind of access generate_flow_diagram gives an agent:

POLICY

How to control generate_flow_diagram

PolicyLayer is an MCP gateway — it sits between your AI agents and Chart Offline, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_flow_diagram:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "generate_flow_diagram": {
      "limits": [
        {
          "counter": "generate_flow_diagram_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

generate_flow_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.

Create a free account and register Chart Offline — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about generate_flow_diagram

What does the generate_flow_diagram tool do? +

Generate a flow diagram chart to show the steps and decision points of a process or system, such as, scenarios requiring linear process presentation. It is categorised as a Write tool in the Chart Offline MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_flow_diagram? +

Register the Chart Offline MCP server in PolicyLayer and add a rule for generate_flow_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 Chart Offline. Nothing to install.

What risk level is generate_flow_diagram? +

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

Can I rate-limit generate_flow_diagram? +

Yes. Add a rate_limit block to the generate_flow_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 generate_flow_diagram completely? +

Set action: deny in the PolicyLayer policy for generate_flow_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 generate_flow_diagram? +

generate_flow_diagram is provided by the Chart Offline MCP server (liukeyu800/mcp-server-chart-offline). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Chart Offline tool call.

Start from Chart Offline, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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