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

Annotations declare readOnlyHint=false and openWorldHint=true, which already leaves an agent uncertain whether this detail lookup mutates state; the description resolves nothing about authentication, rate limits, or what the call returns. It does not explicitly contradict the annotations, but it adds zero behavioral context beyond them.

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?

It is one sentence with no waste, but that brevity is under-specification rather than conciseness — there is no front-loaded explanation of what the tool actually does or returns.

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?

With three parameters, an unspecified 'include' extension, no output schema, and a non-read-only annotation on what appears to be a detail lookup, the description should carry substantial weight. Instead it provides nothing, so an agent cannot tell what the response contains or how it differs from the many adjacent live/livestream detail tools.

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%: id ('Live broadcast room ID'), country ('Lower case country code'), and include ('Optional extension `core`') are all documented in the schema. The description adds nothing about parameter meaning, which is acceptable at this coverage level but earns only the baseline.

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 bare restatement of the title and endpoint path: 'TikTok Commerce Intelligence CJ: lives/detail API.' It implies retrieval of live-broadcast details only by inference from 'lives/detail'; there is no verb, no statement of what data is returned, and no differentiation from siblings such as nexscope_data_cj_lives_search or nexscope_data_kd_livestream_detail.

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?

No when-to-use guidance, no prerequisites, and no mention of alternatives. The '/detail' suffix weakly implies 'fetch a single live room by ID' as opposed to the sibling search tools, but the agent must infer that entirely from the tool name.

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