create_gantt_chart · Diagram MCP: Risk & Policy

WHAT IT DOES

What create_gantt_chart does on DiagramMCP

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

WHY IT NEEDS A POLICY

Why create_gantt_chart needs a policy

This tool generates Gantt charts (project planning diagrams) by creating new data structures in Mermaid syntax. It is a Write operation because it produces new artifacts that can be modified or exported, but the effects are reversible—generated diagrams can be discarded or regenerated. There is no execution of code, deletion of data, financial impact, or destructive operations.

From the tool's definition Tool name 'create_gantt_chart' and description 'Create a Mermaid Gantt chart' indicate data generation/creation. The server description confirms tools 'create' various diagram artifacts and can 'export results to multiple formats'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_gantt_chart Rate-limited

create_gantt_chart 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": {
    "create_gantt_chart": {
      "limits": [
        {
          "counter": "create_gantt_chart_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 DiagramMCP, so you can run agents against it safely.

FAQ

Questions about create_gantt_chart

What does the create_gantt_chart tool do? +

Create a Mermaid Gantt chart for project planning. It is categorised as a Write tool in the DiagramMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_gantt_chart? +

Register the Diagram MCP server in PolicyLayer and add a rule for create_gantt_chart: 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 DiagramMCP. Nothing to install.

What risk level is create_gantt_chart? +

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

Can I rate-limit create_gantt_chart? +

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

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

create_gantt_chart is provided by the Diagram MCP server (lelondelonmelon/diagrammcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.