Generates a waterfall chart to visualize increases and decreases across stages, clearly reflecting the composition and changes of cumulative values. Suitable for scenarios such as financial analysis and process breakdown.
AI agents use generate_waterfall_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 visualizations programmatically, which constitutes a write operation—it generates new data structures (chart objects/configurations). However, the severity is low because: (1) chart generation is reversible and produces no persistent external side effects, (2) it does not execute arbitrary code or shell commands, (3) it does not delete or overwrite existing data, and (4) it involves no financial…
From the tool's definition Tool generates and creates chart visualizations ('Generates a waterfall chart'). The description indicates it produces output artifacts (charts) that are created but not persisted destructively or with side effects beyond chart generation.
Documented attack patterns abuse exactly the kind of access generate_waterfall_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_waterfall_chart:
{
"version": "1",
"default": "deny",
"tools": {
"generate_waterfall_chart": {
"limits": [
{
"counter": "generate_waterfall_chart_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_waterfall_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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Generates a waterfall chart to visualize increases and decreases across stages, clearly reflecting the composition and changes of cumulative values. Suitable for scenarios such as financial analysis and process breakdown. 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_waterfall_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_waterfall_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_waterfall_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_waterfall_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_waterfall_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.