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montumodi

MongoDB Atlas MCP Server

by montumodi

atlas_user_get_by_id

Retrieve detailed information about a MongoDB Atlas user by providing their unique user ID. Use this tool to look up user attributes and permissions.

Instructions

Get Atlas user by ID

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
userIdYes
optionsNoOptional parameters
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full responsibility for behavioral disclosure. It only states the basic action without mentioning permissions, rate limits, error handling (e.g., user not found), or any side effects. This is insufficient for safe invocation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single short sentence, which is concise but overly minimal. It lacks structured detail that would aid understanding without being overly verbose, but it does not waste words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool has no output schema and no annotations, the description should explain return values and error conditions. It does not, leaving significant gaps in understanding what the tool returns or when it might fail.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 50% (userId has no description; options only says 'Optional parameters'). The description adds no additional meaning beyond the schema, so it fails to compensate for the lack of parameter documentation.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Get Atlas user by ID' clearly states the action (get) and resource (Atlas user) with a specific identifier (ID), distinguishing it from sibling tools like atlas_user_get_all or atlas_user_get_by_name that retrieve users differently.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives such as atlas_user_get_by_name or atlas_user_get_all. Missing context about scenarios where ID is available vs. name, leaving the agent without decision support.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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