write_part

Replace a DOCX part with new XML. Validates well-formedness first.

SERVERDocx SOURCEsecurityronin/docx-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/securityronin-docx-mcp/write-part.md

WHAT IT DOES

What write_part does on Docx

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

RISK

Why write_part is rated Medium

This tool creates or modifies data reversibly by replacing XML parts within a Word document. While replacement could theoretically be undone (e.g., via undo or restoration), the tool itself performs a Write operation—it does not delete irreversibly (Destructive), execute arbitrary code (Execute), or move money (Financial).

From the tool's definition Tool description states 'Replace a DOCX part with new XML', which is a direct modification operation. The verb 'Replace' indicates the tool overwrites/modifies document content at the OOXML structural level.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs write_part safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Docx, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For write_part, this is the rule to start with:

write_part Rate-limited

write_part 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": {
    "write_part": {
      "limits": [
        {
          "counter": "write_part_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Docx, apply this rule, and every write_part call is checked against it from then on.

FAQ

Questions about write_part

What does the write_part tool do? +

Replace a DOCX part with new XML. Validates well-formedness first. It is categorised as a Write tool in the Docx MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_part? +

Register the Docx MCP server in PolicyLayer and add a rule for write_part: 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 Docx. Nothing to install.

What risk level is write_part? +

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

Can I rate-limit write_part? +

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

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

write_part is provided by the Docx MCP server (securityronin/docx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Docx, and thousands of servers like it.

This server

All 219 Docx tools →

Across the catalogue

write_file on 0sec →team_manager_write_memory on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →