word_openDocument

THE RISK

Low Risk

Why word_openDocument needs a policy

Opening a document is a read-side effect — it retrieves/loads an existing file into Word without modifying or deleting it. The primary action is accessing data, not writing or executing anything. Severity is low as misuse would at most expose document contents, but given it operates on local files via COM Interop, there's a minor risk of triggering macros on open, slightly reducing confidence.

From the tool's definition Opens an existing Word document from the specified file path.

Documented attack patterns abuse exactly the kind of access word_openDocument gives an agent:

POLICY

How to control word_openDocument

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Office Interop Word Server, and nothing reaches the server without passing your rules. This is the rule we recommend for word_openDocument:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "word_openDocument": {}
  }
}

word_openDocument is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register MCP Office Interop Word Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Office Interop Word Server tools

Destructive word_deleteText Deletes text relative to the current selection in the active Word document. Execute word_collapseSelection Collapses the current selection to its start or end point. Execute word_moveCursor Moves the cursor by the specified unit and count. Write word_findAndReplace Finds and replaces text within the active Word document. Write word_addTable Adds a new table at the current selection point. Write word_applyTableAutoFormat Applies a predefined style or autoformat to a table. Write word_closeActiveDocument Closes the currently active Word document, optionally saving changes. Write word_createDocument Creates a new, blank Word document.

All 37 MCP Office Interop Word Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about word_openDocument

What does the word_openDocument tool do? +

Opens an existing Word document from the specified file path. It is categorised as a Read tool in the MCP Office Interop Word Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on word_openDocument? +

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

What risk level is word_openDocument? +

word_openDocument is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit word_openDocument? +

Yes. Add a rate_limit block to the word_openDocument 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_openDocument completely? +

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

word_openDocument is provided by the MCP Office Interop Word Server MCP server (mario-andreschak/mcp-msoffice-interop-word). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Office Interop Word Server tool call.

Start from MCP Office Interop Word Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →