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

Annotations already declare readOnlyHint=true and idempotentHint=true, so the operation's safety profile is clear and the description does not contradict it. The description adds no behavioral context beyond listing the data contents—no mention of response size, pagination, or API behavior—but the annotations lower the burden considerably.

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 compact sentence that front-loads the resource and then itemizes its contents with no filler or repetition. Every word earns its place.

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 simple read-only profile lookup, the field list plus the well-documented schema and annotations are sufficient. The lack of an output schema is offset by the explicit enumeration of returned fields; a slightly more explicit note that this returns profile metadata only, not videos or followers, would make it fully complete.

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 description coverage is 100%: both 'id' and 'expand' are fully documented with patterns, defaults, and usage guidance. The description itself adds no parameter-specific meaning, so the baseline 3 is appropriate.

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 states the exact resource ('a creator's profile') and enumerates the returned fields: handle, nickname, bio, follower/following/video counts, privacy/verification flags, and avatar. This clearly distinguishes it from sibling tools like tiktok_creator_videos or tiktok_creator_followers, even though it uses a noun phrase rather than a verb.

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?

There is no explicit when-to-use or when-not-to-use guidance in the description. The schema's id description provides a useful prerequisite ('from tiktok_resolve_username'), which implies the intended flow, but the description itself does not route agents away from alternatives such as tiktok_creator_videos or tiktok_creator_followers.

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