AI agents call describe_table to retrieve information from Starrocks without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves table structure and metadata (schema, columns) without creating, modifying, or deleting data. It is a schema inspection operation typical of read-only database exploration. The read-only nature of the server and the passive retrieval action confirm the Read category. Severity is low as metadata disclosure alone has minimal blast radius.
From the tool's definition Tool name 'describe_table' and description 'Get table schema and column information' indicate retrieval of metadata without modification. Server is explicitly described as 'read-only' and this tool supports 'schema discovery'.
Attacks that exploit this kind of access
Get table schema and column information. It is categorised as a Read tool in the Starrocks MCP Server, which means it retrieves data without modifying state.
Register the Starrocks 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 Starrocks. 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 Starrocks MCP server (jason-ung/starrocks-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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