Get database size and largest tables.
AI agents call get_database_size to retrieve information from PostgreSQL SSH MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs informational queries to retrieve database size metrics and table statistics. It is purely a read operation with no ability to modify, delete, or execute arbitrary code. The low severity reflects minimal blast radius—an AI agent misuse would only expose non-sensitive structural information about database storage.
From the tool's definition Tool name 'get_database_size' and description 'Get database size and largest tables' indicate a query operation that retrieves metadata about database storage without modification. No side effects or data changes occur.
Documented attack patterns abuse exactly the kind of access get_database_size gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PostgreSQL SSH MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_database_size:
{
"version": "1",
"default": "deny",
"tools": {
"get_database_size": {}
}
}get_database_size is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get database size and largest tables. It is categorised as a Read tool in the PostgreSQL SSH MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PostgreSQL SSH MCP Server MCP server in PolicyLayer and add a rule for get_database_size: 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 PostgreSQL SSH MCP Server. Nothing to install.
get_database_size 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 get_database_size 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 get_database_size. 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.
get_database_size is provided by the PostgreSQL SSH MCP Server MCP server (zlash65/postgresql-ssh-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from PostgreSQL SSH MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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12 PostgreSQL SSH MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.