AI agents call mcp_get_column_stats to retrieve information from Mcpql without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves statistical information (likely cardinality, distributions, NULL counts, etc.) about a database column. It performs a read-only query operation with no side effects, no data modification, no code execution, and no destructive actions. The narrow scope (statistics on a single column) and read-only nature make it low severity even in a SQL context.
From the tool's definition Tool name 'mcp_get_column_stats' and description 'Get comprehensive statistics for a specific column in a table' indicate a retrieval operation that queries and returns column statistical metadata without modifying data.
Attacks that exploit this kind of access
Get comprehensive statistics for a specific column in a table. It is categorised as a Read tool in the Mcpql MCP Server, which means it retrieves data without modifying state.
Register the Mcpql MCP server in PolicyLayer and add a rule for mcp_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 Mcpql. Nothing to install.
mcp_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 mcp_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 mcp_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.
mcp_get_column_stats is provided by the Mcpql MCP server (mcpql). 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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