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

Annotations mark readOnlyHint=false and openWorldHint=true, yet the description discloses nothing about side effects, permissions, quota, or why a 'detail' call is flagged non-read-only. With annotations doing all the work and the description contributing zero behavioral context, this is a pure restatement.

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?

One short sentence, so nothing is bloated, but brevity here reflects under-specification rather than economy — the single sentence is a title echo and no information is front-loaded because there is no information.

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?

A detail-lookup tool with three parameters, an unusual non-read-only annotation, and no output schema needs the description to explain what is retrieved and under what conditions. It supplies none of that, leaving an agent unable to judge when or why to call it over its search sibling.

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%, so the three parameters (id, country, include) are already documented in structured form including the 'analysis,embedding' comma-separated option. The description adds no parameter meaning, but baseline 3 applies when the schema carries the full burden.

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 is a near-verbatim restatement of the tool name and title ('ad creative/creatives/detail API'), naming the resource only via the endpoint path. It never says what the tool returns or what a 'creative detail' record contains, so it adds nothing beyond the identifier.

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 when-to-use, when-not-to-use, or alternative guidance. The sibling nexscope_data_cj_ad_creative_creatives_search strongly implies a search-then-detail flow, but the description never states that the id must come from that search, leaving the agent to infer the workflow entirely.

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