Set background shading fill color on a table cell.
AI agents use set_cell_shading 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 performs a write operation (modifies document state) by setting cell shading properties. It is reversible—the user can change the color again or remove the shading. It affects only visual formatting, not document structure or content, and carries minimal risk. It does not delete, execute code, or create financial obligations, making Write the appropriate category with low severity.
From the tool's definition Tool description: 'Set background shading fill color on a table cell.' This modifies the visual formatting of a cell by changing its background color—a reversible cosmetic change to document content.
Documented attack patterns abuse exactly the kind of access set_cell_shading 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_cell_shading:
{
"version": "1",
"default": "deny",
"tools": {
"set_cell_shading": {
"limits": [
{
"counter": "set_cell_shading_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_cell_shading 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 background shading fill color on a table cell. 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_cell_shading: 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_cell_shading 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_cell_shading 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_cell_shading. 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_cell_shading 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.