AI agents call show-table to retrieve information from Kusto without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema information about a table structure (columns) from Azure Data Explorer. It is a read-only operation with no side effects—it does not create, modify, delete, or execute any operations. The blast radius of misuse is minimal since exposing table schema is a non-destructive information retrieval action.
From the tool's definition Tool name 'show-table' and description 'Show the table schema columns' indicate a retrieval operation that queries metadata without modifying data.
Documented attack patterns abuse exactly the kind of access show-table gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kusto, and nothing reaches the server without passing your rules. This is the rule we recommend for show-table:
{
"version": "1",
"default": "deny",
"tools": {
"show-table": {}
}
}show-table is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Show the table schema columns. It is categorised as a Read tool in the Kusto MCP Server, which means it retrieves data without modifying state.
Register the Kusto MCP server in PolicyLayer and add a rule for show-table: 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 Kusto. Nothing to install.
show-table 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 show-table 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 show-table. 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.
show-table is provided by the Kusto MCP server (johnib/kusto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kusto, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Kusto tools catalogued and risk-classified — across an index of 43,000+ MCP servers.