Set the font color of a specific run in a paragraph.
AI agents use set_run_color 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 formatting (font color) in a Microsoft Word document, which constitutes a Write operation. It creates or modifies data reversibly—the color change can be undone or changed again. The severity is medium because while formatting changes affect document appearance, they do not destroy data, execute arbitrary code, or cause financial impact.
From the tool's definition Tool name 'set_run_color' and description 'Set the font color of a specific run in a paragraph' indicate modification of document formatting properties. This is a reversible change operation on document content.
Documented attack patterns abuse exactly the kind of access set_run_color 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_color:
{
"version": "1",
"default": "deny",
"tools": {
"set_run_color": {
"limits": [
{
"counter": "set_run_color_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_run_color 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 the font 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_color: 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_color 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_color 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_color. 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_color 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.