AI agents call test_connection to retrieve information from Dm without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a connection test—a read-only diagnostic operation with no side effects. It retrieves status information about the database connection. While the server also exposes Execute and potentially Destructive tools (execute_sql, execute_sql_file), this specific tool is purely observational. Severity is low because misuse causes no data loss or operational harm.
From the tool's definition Tool name 'test_connection' and description '测试数据库连接状态' (test database connection status) indicates a diagnostic query that checks connectivity without modifying, executing arbitrary code, or deleting data.
Attacks that exploit this kind of access
测试数据库连接状态. It is categorised as a Read tool in the Dm MCP Server, which means it retrieves data without modifying state.
Register the Dm MCP server in PolicyLayer and add a rule for test_connection: 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 Dm. Nothing to install.
test_connection 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 test_connection 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 test_connection. 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.
test_connection is provided by the Dm MCP server (tgich/dm_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.
Teams ship this data inside their own products. See what a licence covers →