tool_set_plot_style · origin- MCP: Risk & Policy

WHAT IT DOES

What tool_set_plot_style does on origin-MCP

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

WHY IT NEEDS A POLICY

Why tool_set_plot_style needs a policy

This tool changes plot presentation attributes but does not delete data, execute code, create financial transactions, or trigger external operations. The modifications are purely cosmetic and completely reversible—users can revert to previous styles or export different versions. It represents a standard Write operation on plot metadata rather than Execute or Destructive action.

From the tool's definition Tool modifies visual properties of an existing plot (color, symbol shape/size, line width/style, fill, transparency, colormap). The description explicitly states 'Modify visual style' which is a reversible data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tool_set_plot_style Rate-limited

tool_set_plot_style 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": {
    "tool_set_plot_style": {
      "limits": [
        {
          "counter": "tool_set_plot_style_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 origin-MCP, so you can run agents against it safely.

FAQ

Questions about tool_set_plot_style

What does the tool_set_plot_style tool do? +

Modify visual style of an existing plot: color, symbol shape/size, line width/style, fill, transparency, colormap. It is categorised as a Write tool in the origin-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 tool_set_plot_style? +

Register the origin- MCP server in PolicyLayer and add a rule for tool_set_plot_style: 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 origin-MCP. Nothing to install.

What risk level is tool_set_plot_style? +

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

Can I rate-limit tool_set_plot_style? +

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

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

tool_set_plot_style is provided by the origin- MCP server (zhang-923-ze/origin-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.