generate_chart_page · ECharts ChartPage MCP Server MCP

WHAT IT DOES

What generate_chart_page does on ECharts ChartPage MCP Server

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

WHY IT NEEDS A POLICY

Why generate_chart_page needs a policy

This tool creates new HTML content (a chart page), which is a Write operation. Severity is low because: (1) the output is explicitly described as 'safe' with 'controlled, deterministic' behavior, (2) chart pages are typically read-only visualizations with no access to sensitive systems, (3) the operation is fully reversible (generated pages can be deleted), and (4) there is no code execution, financial impact, or…

From the tool's definition Tool generates and creates HTML page content from structured JSON data. Description states it produces 'safe, runnable HTML chart pages' with 'controlled, deterministic output.' The verb 'generate' indicates creation of new data/files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_chart_page Rate-limited

generate_chart_page 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": {
    "generate_chart_page": {
      "limits": [
        {
          "counter": "generate_chart_page_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 ECharts ChartPage MCP Server, so you can run agents against it safely.

FAQ

Questions about generate_chart_page

What does the generate_chart_page tool do? +

Generate a safe single-file HTML page powered by Apache ECharts. It is categorised as a Write tool in the ECharts ChartPage MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_chart_page? +

Register the ECharts ChartPage MCP Server MCP server in PolicyLayer and add a rule for generate_chart_page: 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 ECharts ChartPage MCP Server. Nothing to install.

What risk level is generate_chart_page? +

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

Can I rate-limit generate_chart_page? +

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

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

generate_chart_page is provided by the ECharts ChartPage MCP Server MCP server (riverthrimp/echarts-chartpage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.