patch_chart_page · ECharts ChartPage MCP Server MCP

WHAT IT DOES

What patch_chart_page does on ECharts ChartPage MCP Server

AI agents use patch_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 patch_chart_page needs a policy

The tool performs patching operations on chart page specifications, which involves updates to structured data. While the output is HTML (deterministic and runnable), the underlying action is modifying an existing chart configuration and regenerating derived content. This is reversible—the original can be restored or re-patched—so it qualifies as Write rather than Execute or Destructive.

From the tool's definition Patch an existing chart page spec and regenerate HTML. The tool modifies an existing resource (chart page spec) and regenerates output (HTML). This constitutes creating or modifying data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

patch_chart_page Rate-limited

patch_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": {
    "patch_chart_page": {
      "limits": [
        {
          "counter": "patch_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 patch_chart_page

What does the patch_chart_page tool do? +

Patch an existing chart page spec and regenerate HTML. 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 patch_chart_page? +

Register the ECharts ChartPage MCP Server MCP server in PolicyLayer and add a rule for patch_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 patch_chart_page? +

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

Can I rate-limit patch_chart_page? +

Yes. Add a rate_limit block to the patch_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 patch_chart_page completely? +

Set action: deny in the PolicyLayer policy for patch_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 patch_chart_page? +

patch_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.