plot_comparison · VayuChat MCP: Risk & Policy

WHAT IT DOES

What plot_comparison does on VayuChat MCP

AI agents invoke plot_comparison to trigger actions in VayuChat MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why plot_comparison needs a policy

Given the server context (FastMCP server that executes Python code with pandas/numpy and generates matplotlib visualizations) and the tool name suggesting it generates a comparison plot, this most likely executes code to render and possibly save a visualization. Sibling tools like 'execute_code' and 'plot_funding_trend' confirm an Execute pattern for plot-related tools.

From the tool's definition Tool name 'plot_comparison' on a server that executes Python code and generates matplotlib visualizations; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

plot_comparison Rate-limited

plot_comparison stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "plot_comparison": {
      "limits": [
        {
          "counter": "plot_comparison_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches VayuChat MCP, so you can run agents against it safely.

FAQ

Questions about plot_comparison

What does the plot_comparison tool do? +

plot_comparison. It is categorised as a Execute tool in the VayuChat MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on plot_comparison? +

Register the VayuChat MCP server in PolicyLayer and add a rule for plot_comparison: 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 VayuChat MCP. Nothing to install.

What risk level is plot_comparison? +

plot_comparison is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit plot_comparison? +

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

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

plot_comparison is provided by the VayuChat MCP server (nipunbatra/vayuchat-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.