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

Annotations already establish the safe read-only, idempotent, closed-world profile, so the bar is lower, yet the description adds genuine behavioral insight: closed profiles cannot execute and disclosures represent limits rather than measured quality. That is useful context beyond the structured fields, though return/pagination behavior is unaddressed.

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 first sentence front-loads what profiles exist and the ordering constraint well. The final sentence about media IDs and model approval does not apply to a no-param discovery tool, so a nontrivial share of the text does not earn 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 zero-param tool with no output schema, the description identifies the profile categories and the closed-profile rule, which gives an agent enough to call it. It stops short of describing the shape of what is returned (per-profile fields, ID formats) and includes off-tool guidance, leaving it only adequately 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?

The tool takes zero parameters and the schema is 100% described, so there is no parameter surface to document — the baseline for a no-arg tool is 4. The mention of media IDs and model replacement references inputs that do not exist on this schema, adding noise but no incorrect parameter semantics.

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 names a concrete resource — current Subtitles, Lip Sync, Product Photo Editor, Product Video Editor and Motion Transfer profiles — and frames the action as reading them before choosing one, which fits the list_creator_tools name. It does not compare itself to sibling listing tools (list_models, list_media), so full sibling differentiation is absent.

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?

"Read current ... profiles before choosing one" implies the when-to-use context, and "Closed profiles cannot execute" clarifies a selection constraint. However, the closing guidance about owned exact media IDs from list_media/reference import and not replacing the requested model is inapplicable to a zero-parameter listing tool, muddying rather than guiding usage.

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