Generate a dual-axis chart for visualizing two quantitative variables using a combination of bar and line series. Ideal for comparing trends and magnitudes across two metrics with distinct y-axes.
AI agents use generate_dual_axis_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 generates interactive chart visualizations by creating new chart objects/definitions. While the output is typically ephemeral (rendered in UI), the act of generation constitutes Write category: it produces new structured data. The blast radius is minimal—misuse would generate unwanted or misleading charts, not cause irreversible damage, financial loss, or code execution.
From the tool's definition Tool name 'generate_dual_axis_chart' and description indicate it creates/generates visualization artifacts. The verb 'generate' and context of creating chart objects represents data creation (the chart definition/configuration itself), not mere retrieval.
Documented attack patterns abuse exactly the kind of access generate_dual_axis_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_dual_axis_chart:
{
"version": "1",
"default": "deny",
"tools": {
"generate_dual_axis_chart": {
"limits": [
{
"counter": "generate_dual_axis_chart_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_dual_axis_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 dual-axis chart for visualizing two quantitative variables using a combination of bar and line series. Ideal for comparing trends and magnitudes across two metrics with distinct y-axes. 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_dual_axis_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_dual_axis_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_dual_axis_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_dual_axis_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_dual_axis_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.