List all TNS entries found in tnsnames.ora. Searches TNS_ADMIN, ORACLE_HOME/network/admin, and common install paths. Use this to discover available databases before connecting.
AI agents call oracle_list_tns_entries to retrieve information from Oracle APEX MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates TNS (Transparent Network Substrate) database connection entries from configuration files. While it performs no modifications, deletions, or code execution, the severity is elevated to medium because the enumerated TNS entries can expose sensitive information about available databases, hostnames, ports, and network topology that could facilitate reconnaissance for targeted attacks.
From the tool's definition Tool description states 'List all TNS entries found in tnsnames.ora' and 'Searches TNS_ADMIN, ORACLE_HOME/network/admin, and common install paths.' This is purely informational retrieval with no side effects.
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
List all TNS entries found in tnsnames.ora. Searches TNS_ADMIN, ORACLE_HOME/network/admin, and common install paths. Use this to discover available databases before connecting. It is categorised as a Read tool in the Oracle APEX MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Oracle APEX MCP Server MCP server in PolicyLayer and add a rule for oracle_list_tns_entries: 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 APEX MCP Server. Nothing to install.
oracle_list_tns_entries 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 oracle_list_tns_entries 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 oracle_list_tns_entries. 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.
oracle_list_tns_entries is provided by the Oracle APEX MCP Server MCP server (silviosotelo/oracle-apex-mcp-server). 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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