chart_line · SVG Canvas MCP: Risk & Policy

WHAT IT DOES

What chart_line does on SVG Canvas MCP

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

WHY IT NEEDS A POLICY

Why chart_line needs a policy

This tool creates a new line chart visualization within SVG canvas, modifying the canvas state reversibly. It falls under Write category as it creates/generates visual content that can be undone or modified. Severity is low because the blast radius of misuse (generating an unwanted chart) is minimal and easily reversible.

From the tool's definition Tool name 'chart_line' and server description indicate creation of SVG graphics ('creation and manipulation of professional-grade SVG graphics').

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

chart_line Rate-limited

chart_line 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": {
    "chart_line": {
      "limits": [
        {
          "counter": "chart_line_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 SVG Canvas MCP, so you can run agents against it safely.

FAQ

Questions about chart_line

What does the chart_line tool do? +

선 차트를 생성합니다. It is categorised as a Write tool in the SVG Canvas MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on chart_line? +

Register the SVG Canvas MCP server in PolicyLayer and add a rule for chart_line: 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 SVG Canvas MCP. Nothing to install.

What risk level is chart_line? +

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

Can I rate-limit chart_line? +

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

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

chart_line is provided by the SVG Canvas MCP server (kim62210/svg-canvas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.