AI agents use create_chart 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.
Creating a chart adds new content to a document and modifies its structure, but this is reversible (charts can be deleted). The operation does not execute arbitrary code, delete data irreversibly, or move money. The empty description reduces confidence slightly, but the context of Create-prefixed tools on a document manipulation server clearly indicates this is a Write operation.
From the tool's definition Tool name 'create_chart' combined with server description stating it 'Enables interaction with LibreOffice documents (Writer, Calc, Impress, Draw)' and 'supporting document management' indicates this creates new objects within a document.
Documented attack patterns abuse exactly the kind of access create_chart 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 create_chart:
{
"version": "1",
"default": "deny",
"tools": {
"create_chart": {
"limits": [
{
"counter": "create_chart_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_chart 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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create_chart. 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 create_chart: 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.
create_chart 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 create_chart 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 create_chart. 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.
create_chart 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.