Get detailed schema information for a specific table including columns, data types, constraints, indexes, and keys.
AI agents call describe_table to retrieve information from USQL MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only query operation that retrieves metadata about table structure. It has no capability to modify, delete, or execute code. The blast radius of misuse is minimal—an attacker gains schema visibility but cannot alter data or systems. Low severity is appropriate for informational queries.
From the tool's definition Tool retrieves schema information (columns, data types, constraints, indexes, keys) for a table. Description uses 'Get' and specifies information-only retrieval with no modification, deletion, or execution of arbitrary commands.
Attacks that exploit this kind of access
Get detailed schema information for a specific table including columns, data types, constraints, indexes, and keys. It is categorised as a Read tool in the USQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the USQL MCP Server MCP server in PolicyLayer and add a rule for describe_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 USQL MCP Server. Nothing to install.
describe_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 describe_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 describe_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.
describe_table is provided by the USQL MCP Server MCP server (jvm/usql-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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