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

No annotations are provided, so the description carries the full behavioral burden. It mentions the default game (GTA VI) but does not disclose output format, read-only nature, data source, rate limits, or error behavior.

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 core sentence is short and front-loaded. However, the bracketed prefix '［NEW遊戲發售預告片揪團交換］' is confusing marketing text that does not help an agent invoke the tool and makes the definition less clean.

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 countdown tool, the description still leaves key details unspecified: what q means, how input should be formatted, and what the return value looks like. With no output schema and no annotations, more context is needed.

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 0% for the single parameter q, and the description does not explain what q should contain or its expected format. It only notes a default value, which gives minimal semantic guidance.

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 a specific verb+resource: calculating how many days remain until a game's release, with GTA VI as the default example. It is clear enough to distinguish from non-countdown siblings, but it does not differentiate itself from other countdown or calendar tools such as screen__release_countdown or games__release_calendar.

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 guidance, no prerequisites, and no mention of alternatives. The tool's purpose implies its use case, but the description does not help an agent choose between this and related siblings like games__release_calendar or screen__release_countdown.

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