create_user

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

With no annotations, the description should disclose behavioral traits like idempotency, permission requirements, side effects, or error conditions. It only states creation, leaving critical aspects (e.g., duplicate handling, required fields in user_data) unspecified.

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 description is very concise (7 words) and front-loads the action and resource. While efficient, it sacrifices valuable context that could aid an agent. It is not verbose but lacks completeness.

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?

Given the nested object parameter ('user_data'), absence of output schema, and many sibling tools, the description is insufficient. It does not specify required fields in user_data, return value, or contrast with similar tools like 'update_user'. The agent is left with ambiguity about invocation.

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?

Schema coverage is 100%, so the schema already documents both parameters. The description adds no additional meaning beyond 'Create a new user in the realm.' It does not clarify expected structure of 'user_data' or constraints beyond what the schema states.

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 description clearly identifies the action ('Create') and resource ('user') within a scope ('in the realm'). It distinguishes the tool's primary function from sibling tools like 'update_user' or 'add_user_to_group', though it could be more explicit about differences.

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 is provided on when to use this tool, prerequisites (e.g., realm existence), or when alternative tools (e.g., 'update_user') are more appropriate. The description lacks any context for decision-making.

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