Show the schema of a table: columns, types, keys, indexes, and CREATE statement.
AI agents call describe_table to retrieve information from Querybridge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays structural information about a database table (schema, columns, types, keys, indexes, DDL). It performs a read-only query that inspects metadata without creating, modifying, deleting, or executing any data-altering operations. The blast radius of misuse is minimal—an attacker gains only information about table structure, which may inform further attacks but causes no immediate harm.
From the tool's definition Tool name 'describe_table' and description 'Show the schema of a table: columns, types, keys, indexes, and CREATE statement' indicate retrieval of metadata with no modification or execution of data operations.
Attacks that exploit this kind of access
Show the schema of a table: columns, types, keys, indexes, and CREATE statement. It is categorised as a Read tool in the Querybridge MCP Server, which means it retrieves data without modifying state.
Register the Querybridge 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 Querybridge. 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 Querybridge MCP server (mahmoudhassanmustafa/querybridge-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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