Set highlight color of a specific run in a paragraph.
AI agents use set_run_highlight 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.
The tool modifies document content by changing the highlight color of text runs, which is a write operation. It is reversible (highlighting can be changed or removed), non-destructive, and does not execute code or delete data. Low severity due to limited blast radius—the worst outcome is unwanted text highlighting in a Word document, which can be easily undone.
From the tool's definition Tool name 'set_run_highlight' and description 'Set highlight color of a specific run in a paragraph' indicates modification of document formatting. This is a reversible change to document properties (highlighting/styling).
Documented attack patterns abuse exactly the kind of access set_run_highlight gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Docx, and nothing reaches the server without passing your rules. This is the rule we recommend for set_run_highlight:
{
"version": "1",
"default": "deny",
"tools": {
"set_run_highlight": {
"limits": [
{
"counter": "set_run_highlight_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_run_highlight 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.
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Set highlight color 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.
Register the Docx MCP server in PolicyLayer and add a rule for set_run_highlight: 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.
set_run_highlight is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the set_run_highlight 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.
Set action: deny in the PolicyLayer policy for set_run_highlight. 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.
set_run_highlight 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.
Start from Docx, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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219 Docx tools catalogued and risk-classified — across an index of 43,000+ MCP servers.