Get credentials for a PostgreSQL database instance
AI agents call get_postgresql_credentials to retrieve information from Linode 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 database credentials—a read operation that queries/fetches information without side effects. While credentials are sensitive, the tool itself performs no write, destructive, execute, or financial operations. Access control and secret masking should be managed separately at the authentication/authorization layer.
From the tool's definition Tool name 'get_postgresql_credentials' and description 'Get credentials for a PostgreSQL database instance' indicate retrieval of existing credentials with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access get_postgresql_credentials gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Linode MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_postgresql_credentials:
{
"version": "1",
"default": "deny",
"tools": {
"get_postgresql_credentials": {}
}
}get_postgresql_credentials is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get credentials for a PostgreSQL database instance. It is categorised as a Read tool in the Linode MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Linode MCP Server MCP server in PolicyLayer and add a rule for get_postgresql_credentials: 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 Linode MCP Server. Nothing to install.
get_postgresql_credentials 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_postgresql_credentials 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_postgresql_credentials. 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_postgresql_credentials is provided by the Linode MCP Server MCP server (takashito/linode-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Linode 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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416 Linode MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.