Get statistics for a specific column.
AI agents call get_column_stats to retrieve information from VisiData 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 statistical calculations (mean, median, variance, etc.) on existing data and returns the results. It has no side effects, does not modify or delete data, does not execute arbitrary code, and does not involve financial operations. It is a straightforward data retrieval and analysis function consistent with VisiData's analytical capabilities.
From the tool's definition Tool name 'get_column_stats' and description 'Get statistics for a specific column' indicate a read-only operation that retrieves and computes aggregate statistics without modifying data.
Attacks that exploit this kind of access
Get statistics for a specific column. It is categorised as a Read tool in the VisiData MCP Server MCP Server, which means it retrieves data without modifying state.
Register the VisiData MCP Server MCP server in PolicyLayer and add a rule for get_column_stats: 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 VisiData MCP Server. Nothing to install.
get_column_stats 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 get_column_stats 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 get_column_stats. 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.
get_column_stats is provided by the VisiData MCP Server MCP server (moeloubani/visidata-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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