Generate distribution plot comparing datasets for a specific column. Returns base64-encoded PNG image. Automatically chooses bar plot (categorical) or KDE plot (numerical).
AI agents call plot_distribution to retrieve information from Rockfish MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs data analysis and visualization generation—a read-only operation that queries dataset columns to produce a plot. It has no side effects on the underlying data, databases, or system state. The output is informational (an image), making it a Read category tool with low severity risk.
From the tool's definition Tool generates and returns a visualization ('distribution plot comparing datasets') without modifying data. The description emphasizes retrieval of a 'base64-encoded PNG image' output with no mention of creating, updating, deleting, or executing operations.
Attacks that exploit this kind of access
Generate distribution plot comparing datasets for a specific column. Returns base64-encoded PNG image. Automatically chooses bar plot (categorical) or KDE plot (numerical). It is categorised as a Read tool in the Rockfish MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Rockfish MCP Server MCP server in PolicyLayer and add a rule for plot_distribution: 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 Rockfish MCP Server. Nothing to install.
plot_distribution is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the plot_distribution 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 plot_distribution. 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.
plot_distribution is provided by the Rockfish MCP Server MCP server (wolfdancer/rockfish-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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