set_run_size

Set the font size of a specific run in a paragraph.

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/set-run-size.md

WHAT IT DOES

What set_run_size does on Docx

AI agents use set_run_size 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 set_run_size is rated Medium

This tool creates or modifies document data (font size properties) reversibly, which aligns with the Write category. While document formatting changes are non-destructive and can be undone, they do represent modification of the document state.

From the tool's definition Tool description states 'Set the font size of a specific run in a paragraph.' This modifies document formatting properties. Server description confirms 'editing...Microsoft Word documents' and 'OOXML-level document manipulation'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_run_size 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 set_run_size, this is the rule to start with:

set_run_size Rate-limited

set_run_size 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": {
    "set_run_size": {
      "limits": [
        {
          "counter": "set_run_size_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 set_run_size call is checked against it from then on.

FAQ

Questions about set_run_size

What does the set_run_size tool do? +

Set the font size of a specific run in a paragraph. 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 set_run_size? +

Register the Docx MCP server in PolicyLayer and add a rule for set_run_size: 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 set_run_size? +

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

Can I rate-limit set_run_size? +

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

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

set_run_size 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

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