plot_weekday_weekend · VayuChat MCP: Risk & Policy

WHAT IT DOES

What plot_weekday_weekend does on VayuChat MCP

AI agents invoke plot_weekday_weekend 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_weekday_weekend needs a policy

Per the server description, visualizations are produced by executing Python code with matplotlib. While the output is a chart (read-like result), the mechanism involves code execution on the server. No data is modified or deleted, but arbitrary execution environment is involved. Severity is medium because misuse is limited to resource consumption or rendering unexpected content.

From the tool's definition 'Create weekday vs weekend comparison chart' — generates a matplotlib visualization, which involves executing Python/pandas/matplotlib code on the server

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

plot_weekday_weekend Rate-limited

plot_weekday_weekend 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_weekday_weekend": {
      "limits": [
        {
          "counter": "plot_weekday_weekend_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_weekday_weekend

What does the plot_weekday_weekend tool do? +

Create weekday vs weekend comparison chart. 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_weekday_weekend? +

Register the VayuChat MCP server in PolicyLayer and add a rule for plot_weekday_weekend: 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_weekday_weekend? +

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

Can I rate-limit plot_weekday_weekend? +

Yes. Add a rate_limit block to the plot_weekday_weekend 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_weekday_weekend completely? +

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

plot_weekday_weekend 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.