Generate a polar chart (rose, radar, pie) to display numerical differences among different categories using radius and angle in polar coordinates.
AI agents use generate_polar_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 visualization objects that represent data in polar coordinates. It is a Write operation because it produces new structured output (chart configurations/renderings) without side effects. It is not Execute because it doesn't run arbitrary code or external operations; it has a fixed, specialized purpose.
From the tool's definition The tool generates and creates chart visualizations ('Generate a polar chart'). It produces new data artifacts (chart objects) but does not modify existing data irreversibly or execute arbitrary code.
Documented attack patterns abuse exactly the kind of access generate_polar_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_polar_chart:
{
"version": "1",
"default": "deny",
"tools": {
"generate_polar_chart": {
"limits": [
{
"counter": "generate_polar_chart_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_polar_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 polar chart (rose, radar, pie) to display numerical differences among different categories using radius and angle in polar coordinates. 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_polar_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_polar_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_polar_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_polar_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_polar_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.