Get a specific database user by username
AI agents call user_get to retrieve information from MongoDB Atlas 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 user information from MongoDB Atlas by username. The operation is read-only with no capability to modify, delete, or execute actions. The blast radius is minimal as it only exposes user metadata that is typically accessible to authenticated operators of the MongoDB cluster. No sensitive credentials or financial operations are involved.
From the tool's definition Tool name 'user_get' and description 'Get a specific database user by username' indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Get a specific database user by username. It is categorised as a Read tool in the MongoDB Atlas MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MongoDB Atlas MCP Server MCP server in PolicyLayer and add a rule for user_get: 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 MongoDB Atlas MCP Server. Nothing to install.
user_get 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 user_get 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 user_get. 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.
user_get is provided by the MongoDB Atlas MCP Server MCP server (montumodi/mongodb-atlas-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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