generate_line_chart

THE RISK

Medium Risk

Why generate_line_chart needs a policy

This tool creates/generates new data artifacts (SVG charts) in a reversible manner. It does not execute arbitrary code, delete data, move money, or modify existing records—it simply produces visualization output. This is categorized as Write because generation of new visual content is a form of data creation.

From the tool's definition Tool 'generate_line_chart' creates SVG chart output; the description states it generates a chart to display data visualization. The server generates SVG content, which is a form of content creation with no destructive or execute-level side effects.

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

POLICY

How to control generate_line_chart

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_line_chart:

policy.json

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

generate_line_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.

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

Related tools and policies

More Chart Offline tools

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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_line_chart

What does the generate_line_chart tool do? +

Generate a line chart to show trends over time, such as, the ratio of Apple computer sales to Apple. 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_line_chart? +

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

What risk level is generate_line_chart? +

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

Can I rate-limit generate_line_chart? +

Yes. Add a rate_limit block to the generate_line_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 generate_line_chart completely? +

Set action: deny in the PolicyLayer policy for generate_line_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 generate_line_chart? +

generate_line_chart 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.

CHECK YOUR STACK →