Create user.

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

The description does not disclose that creating a user is a destructive/write operation. Annotations lack destructiveHint; the description only adds an authentication constraint. No information about side effects, permissions, or expected behavior.

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

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

The single sentence is short but fails to convey the essential purpose. It is not concise because it omits critical information.

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

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

For a tool with 8 parameters, no output schema, and no descriptions, the description is woefully incomplete. It does not cover prerequisites, return values, or parameter semantics, leaving the agent with insufficient information to use the tool correctly.

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

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

With only 13% schema coverage and no parameter descriptions in the input schema, the description should compensate but does not. None of the 8 parameters (id, username, firstName, etc.) are explained, leaving the agent without guidance on their meaning or usage.

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

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

The title 'Create user.' indicates the purpose, but the description fails to state that the tool creates a new user. It only provides a usage constraint (must be logged in), making the core action unclear.

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

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 like update_user or delete_user. The only hint is 'only be done by the logged in user,' which is an access condition, not a usage guideline.

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