word_mail_merge · Office MCP Server MCP: Risk & Policy

WHAT IT DOES

What word_mail_merge does on Office MCP Server

AI agents use word_mail_merge 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 word_mail_merge needs a policy

Mail merge typically creates or modifies Word documents by merging template data with a data source, which is a Write operation. However, the description is empty, so confidence is low. Based on the server context and tool name, it most likely generates/writes document files rather than reading or executing arbitrary code.

From the tool's definition Tool name 'word_mail_merge' on a server described as enabling 'creating, editing, and processing Word, Excel, and PowerPoint documents'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

word_mail_merge Rate-limited

word_mail_merge 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": {
    "word_mail_merge": {
      "limits": [
        {
          "counter": "word_mail_merge_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 word_mail_merge

What does the word_mail_merge tool do? +

word_mail_merge. 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 word_mail_merge? +

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

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

Can I rate-limit word_mail_merge? +

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

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

word_mail_merge 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.