generate_flow_diagram · Chart MCP Server MCP: Risk & Policy

WHAT IT DOES

What generate_flow_diagram does on Chart MCP Server

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

WHY IT NEEDS A POLICY

Why generate_flow_diagram needs a policy

This tool creates visual diagrams (flow charts) which is reversible data creation. It does not execute external code, delete data, move money, or perform irreversible operations. The output is a diagram artifact that can be regenerated, edited, or discarded. Severity is low because misuse would only result in unwanted chart artifacts with no destructive or operational consequences.

From the tool's definition Tool description indicates 'generate' action: generates flow diagrams. The name 'generate_flow_diagram' and context as a chart generation tool confirms it creates new content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_flow_diagram Rate-limited

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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "generate_flow_diagram": {
      "limits": [
        {
          "counter": "generate_flow_diagram_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 Chart MCP Server, so you can run agents against it safely.

FAQ

Questions about generate_flow_diagram

What does the generate_flow_diagram tool do? +

生成优雅的流程图. It is categorised as a Write tool in the Chart 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 generate_flow_diagram? +

Register the Chart MCP Server 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 MCP Server. 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 MCP Server MCP server (qingfeng0512/chart-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.