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

No annotations are provided, so the description carries the full burden of disclosing behavioral traits. It only says 'View,' implying a read-only operation, but it does not mention authentication requirements, rate limits, output format, or any side effects. The lack of detail beyond the action is minimal.

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 that is front-loaded with the verb and resource. It is appropriately sized for a simple getter tool, with no wasted words. However, the brevity sacrifices useful detail, preventing a higher score.

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?

The tool is a simple read operation with one parameter and no output schema, but the description is minimal. It does not describe the return structure (e.g., profile fields or listing format), error conditions, or any prerequisite steps. Given no annotations, the description does insufficient work to help the agent understand invocation behavior in context.

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 has 0% description coverage and one parameter, 'username'. The description adds no explicit explanation of the parameter, its format, or its required semantics. While the parameter name is self-explanatory, the description fails to compensate for the schema's lack of detail, leaving the agent to guess what 'username' refers to in context.

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 'View a builder's full profile and listings' uses a clear verb ('View') and resource ('builder's full profile and listings'), distinguishing it from sibling tools like search_builders (which searches) and get_listing (which likely gets a single listing). It communicates the tool's scope effectively, though it doesn't explicitly contrast with alternatives.

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?

The description provides no explicit when-to-use guidance, exclusions, or references to alternative tools. Since siblings include search_builders and get_listing, the agent must infer when to use this tool versus those, which is a clear gap.

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