Generate a pie chart to visually represent the proportional distribution of categories within a dataset. Ideal for illustrating the relative contribution of each category to the whole.
AI agents use generate_pie_chart to create or update resources in Vchart — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vchart environment.
This tool creates new chart visualization objects, making it a Write operation. However, the blast radius is minimal because: (1) chart generation is read-only in terms of the underlying data—it does not modify source datasets, (2) the output is a reversible artifact (charts can be deleted/regenerated), (3) misuse would produce incorrect visualizations rather than system compromise or data loss.
From the tool's definition Tool generates and creates chart visualizations ('Generate a pie chart'), which involves creating new data artifacts (chart objects/configurations). The description uses 'generate' and describes creating visual representations.
Documented attack patterns abuse exactly the kind of access generate_pie_chart gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vchart, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_pie_chart:
{
"version": "1",
"default": "deny",
"tools": {
"generate_pie_chart": {
"limits": [
{
"counter": "generate_pie_chart_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_pie_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 pie chart to visually represent the proportional distribution of categories within a dataset. Ideal for illustrating the relative contribution of each category to the whole. It is categorised as a Write tool in the Vchart MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vchart MCP server in PolicyLayer and add a rule for generate_pie_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 Vchart. Nothing to install.
generate_pie_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_pie_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_pie_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_pie_chart is provided by the Vchart MCP server (visactor/vchart-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Vchart tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
16 Vchart tools catalogued and risk-classified — across an index of 42,500+ MCP servers.