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

With no annotations provided, the description carries the full transparency burden. It only states that it fetches public data, but does not disclose potential behaviors like error handling for missing usernames, pagination of videos, rate limits, or auth requirements. The description is too thin for full behavioral disclosure.

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 front-loads the main verb and resource. Every word earns its place with no redundancy or filler.

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 tool's low complexity (one parameter, no output schema, no annotations), the description is reasonably complete: it states the action and the high-level return content (profile and videos). However, it could note whether the 'newest videos' are limited in count or paginated, which would add completeness. Still, for a simple read tool, it covers the essential 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 input schema has 100% description coverage for the single 'username' parameter, so the baseline is 3. The description adds no additional parameter semantics beyond the schema, which already clearly states 'Creator username (without @)'.

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 specifies a clear verb ('Fetch') and resource ('a creator's public profile plus their newest videos'). It distinguishes from sibling tools like get_video (which fetches a video) and list_creators (which lists creators), making the tool's unique purpose obvious.

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 implies usage: when you need a single creator's profile and recent videos, use this tool. However, it does not explicitly state when to prefer alternatives or provide exclusions (e.g., 'for list of creators, use list_creators'). The guideline is implied, not explicit.

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