AI agents use format_cell_range to create or update resources in Libreoffice — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Libreoffice environment.
Formatting cells changes document state reversibly (Write category). Severity is medium because formatting changes can affect data interpretation and document usability, but do not delete data or execute arbitrary code. Confidence is 0.75 due to the empty tool description, which prevents verification of exact behavior or whether it could have Execute-like side effects.
From the tool's definition Tool name 'format_cell_range' indicates modification of cell formatting in LibreOffice Calc. The libreoffice-mcp server description explicitly mentions 'data analysis' and interaction with Calc documents.
Documented attack patterns abuse exactly the kind of access format_cell_range gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Libreoffice, and nothing reaches the server without passing your rules. This is the rule we recommend for format_cell_range:
{
"version": "1",
"default": "deny",
"tools": {
"format_cell_range": {
"limits": [
{
"counter": "format_cell_range_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}format_cell_range 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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format_cell_range. It is categorised as a Write tool in the Libreoffice MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Libreoffice MCP server in PolicyLayer and add a rule for format_cell_range: 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 Libreoffice. Nothing to install.
format_cell_range 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 format_cell_range 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 format_cell_range. 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.
format_cell_range is provided by the Libreoffice MCP server (waterpistolai/libreoffice-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Libreoffice, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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24 Libreoffice tools catalogued and risk-classified — across an index of 43,000+ MCP servers.