format_excel_chart · Office MCP Server MCP: Risk & Policy

WHAT IT DOES

What format_excel_chart does on Office MCP Server

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

WHY IT NEEDS A POLICY

Why format_excel_chart needs a policy

The tool creates or modifies spreadsheet chart formatting reversibly—it changes visual properties without deleting data or executing arbitrary code. This is a Write operation because changes can be undone through normal document editing. Severity is medium because misuse (e.g., obscuring data through malicious formatting) could impact document usability but does not cause irreversible data loss or financial harm.

From the tool's definition Tool name 'format_excel_chart' and context show this modifies Excel chart properties. Description in Chinese translates to 'format Excel chart,' indicating data modification rather than deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

format_excel_chart Rate-limited

format_excel_chart 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": {
    "format_excel_chart": {
      "limits": [
        {
          "counter": "format_excel_chart_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 Office MCP Server, so you can run agents against it safely.

FAQ

Questions about format_excel_chart

What does the format_excel_chart tool do? +

格式化 Excel 图表. It is categorised as a Write tool in the Office 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 format_excel_chart? +

Register the Office MCP Server MCP server in PolicyLayer and add a rule for format_excel_chart: 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 Office MCP Server. Nothing to install.

What risk level is format_excel_chart? +

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

Can I rate-limit format_excel_chart? +

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

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

format_excel_chart is provided by the Office MCP Server MCP server (walkingzzzy/office-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.