Generate a treemap chart to display hierarchical data and can intuitively show comparisons between items at the same level, such as, show disk space usage with treemap.
AI agents use generate_treemap_chart to create or update resources in Chart Offline — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Chart Offline environment.
This tool creates new SVG chart visualizations without modifying persistent data or triggering external operations. Chart generation is a reversible, non-destructive write operation. The output is a visual artifact (SVG), not a persistent database change. No network calls, command execution, or data deletion occurs.
From the tool's definition Tool name 'generate_treemap_chart' and description 'Generate a treemap chart' indicates creation of chart/visualization output. The server description states it 'generating 15 types of SVG charts' — this is content generation.
Documented attack patterns abuse exactly the kind of access generate_treemap_chart gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Chart Offline, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_treemap_chart:
{
"version": "1",
"default": "deny",
"tools": {
"generate_treemap_chart": {
"limits": [
{
"counter": "generate_treemap_chart_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_treemap_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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Generate a treemap chart to display hierarchical data and can intuitively show comparisons between items at the same level, such as, show disk space usage with treemap. It is categorised as a Write tool in the Chart Offline MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Chart Offline MCP server in PolicyLayer and add a rule for generate_treemap_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 Chart Offline. Nothing to install.
generate_treemap_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 generate_treemap_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 generate_treemap_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.
generate_treemap_chart is provided by the Chart Offline MCP server (liukeyu800/mcp-server-chart-offline). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Chart Offline, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
15 Chart Offline tools catalogued and risk-classified — across an index of 43,000+ MCP servers.