search_tables_schema · Oracle MCP Server MCP: Risk & Policy

WHAT IT DOES

What search_tables_schema does on Oracle MCP Server

AI agents call search_tables_schema to retrieve information from Oracle MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why search_tables_schema needs a policy

Schema search operations retrieve metadata about database structure without executing DML/DDL or modifying data. Even with empty description, the naming convention, server purpose (providing schema information), and sibling Read-only tools all point to a safe query operation with minimal blast radius if misused.

From the tool's definition Tool name 'search_tables_schema' indicates schema querying/retrieval without modification. The Oracle MCP Server description states it 'provides contextual Oracle database schema information', and sibling tools like 'get_database_vendor_info',…

Attacks that exploit this kind of access

Questions about search_tables_schema

What does the search_tables_schema tool do? +

search_tables_schema. It is categorised as a Read tool in the Oracle MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on search_tables_schema? +

Register the Oracle MCP Server MCP server in PolicyLayer and add a rule for search_tables_schema: 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 Oracle MCP Server. Nothing to install.

What risk level is search_tables_schema? +

search_tables_schema is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit search_tables_schema? +

Yes. Add a rate_limit block to the search_tables_schema 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.

How do I block search_tables_schema completely? +

Set action: deny in the PolicyLayer policy for search_tables_schema. 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.

What MCP server provides search_tables_schema? +

search_tables_schema is provided by the Oracle MCP Server MCP server (zhengwanbo/oracle-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.