add_excel_chart_trendline · Office MCP Server MCP

WHAT IT DOES

What add_excel_chart_trendline does on Office MCP Server

AI agents use add_excel_chart_trendline 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 add_excel_chart_trendline needs a policy

Adding a trendline to an Excel chart creates or modifies document content reversibly. This falls under Write (creates/modifies data reversibly) rather than Read (no modification) or more severe categories. Severity is medium because modifying charts in shared/critical Excel files could mislead stakeholders, but the change is easily undone.

From the tool's definition Tool name 'add_excel_chart_trendline' indicates adding/modifying Excel chart elements. Sibling tools (add_excel_comment, add_image_to_ppt, add_heading_to_word, etc.) all perform reversible document modifications. Description is empty, limiting precision.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_excel_chart_trendline Rate-limited

add_excel_chart_trendline 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": {
    "add_excel_chart_trendline": {
      "limits": [
        {
          "counter": "add_excel_chart_trendline_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 add_excel_chart_trendline

What does the add_excel_chart_trendline tool do? +

add_excel_chart_trendline. 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 add_excel_chart_trendline? +

Register the Office MCP Server MCP server in PolicyLayer and add a rule for add_excel_chart_trendline: 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 add_excel_chart_trendline? +

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

Can I rate-limit add_excel_chart_trendline? +

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

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

add_excel_chart_trendline 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.