plot_hourly_pattern · VayuChat MCP: Risk & Policy

WHAT IT DOES

What plot_hourly_pattern does on VayuChat MCP

AI agents invoke plot_hourly_pattern 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_hourly_pattern needs a policy

Plotting tools on this server involve executing Python code to generate visualizations (as stated in the server description). While the primary output is a chart (read-like), the mechanism involves code execution. The description is minimal, lowering confidence.

From the tool's definition Tool is named 'plot_hourly_pattern' and described as 'Plot hourly patterns.' It runs on a server that executes Python code with pandas/numpy and generates matplotlib visualizations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

plot_hourly_pattern Rate-limited

plot_hourly_pattern 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_hourly_pattern": {
      "limits": [
        {
          "counter": "plot_hourly_pattern_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_hourly_pattern

What does the plot_hourly_pattern tool do? +

Plot hourly patterns. 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_hourly_pattern? +

Register the VayuChat MCP server in PolicyLayer and add a rule for plot_hourly_pattern: 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_hourly_pattern? +

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

Can I rate-limit plot_hourly_pattern? +

Yes. Add a rate_limit block to the plot_hourly_pattern 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_hourly_pattern completely? +

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

plot_hourly_pattern 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.

// THE FULL RECORD

plot_hourly_pattern is one line of VayuChat's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →