get_user

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does not state whether this is a read-only operation (likely, given 'Get'), whether it requires authentication, what happens if the user does not exist, or any throttling/error behavior. It mentions nothing beyond the purpose, leaving the agent to guess at side effects and failure modes.

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 a single, concise sentence with no fluff, and it is front-loaded with the main purpose. It is efficient, though it could have added more detail in the same length. The conciseness itself is good, but it sacrifices necessary context.

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 a single parameter and no output schema, the description is minimally sufficient for a simple lookup, but it lacks context about return format, error handling, and relationship to sibling tools. For an API with many similar tools, the absence of routing or context makes it incomplete for reliable agent selection.

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?

The schema coverage is 100% and the sole parameter 'username' is described as 'Username to look up', which aligns with the description. The description adds no additional meaning beyond the schema; it just reiterates the intent. A baseline 3 is appropriate since the schema is sufficient for the single parameter.

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 'Get details of a specific user' names the verb and resource clearly, but it is generic and does little to differentiate from sibling tools like list_users, create_user, update_user, or delete_user. It states what it does but not the specific scope (e.g., vs. a user list). A 3 is appropriate as it is clear but not differentiating.

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 versus alternatives like list_users or get_client. The agent must infer usage from the name alone, which is insufficient given there are multiple user-related tools and other entity lookup tools. This is a critical gap.

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