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

No annotations are supplied, so the description carries the full burden. It usefully enumerates what data the tool surfaces (production, release schedule, postponement history, trailers, news) and notes multilingual query support, but it says nothing about permissions, rate limits, or what happens on a failed/ambiguous match. Read-only behavior is only implied by the lookup verb.

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 dense but well-formed sentence, front-loaded with the database scope tag followed by the action and the list of returned data. Every clause adds information; the enumeration of fields is long but earns its place given there is no output schema.

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 no output schema and no annotations, the description does the heavy lifting by listing the returned data categories and accepted query languages. It is nearly complete for a lookup tool; only failure/ambiguity behavior and any access constraints are unaddressed.

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 coverage is 0% and the single 'q' parameter has no description, so the description must compensate. It does so well: it states that Chinese, English and Japanese titles are all accepted and gives concrete examples (沙丘3, Avengers Doomsday, 薬屋のひとりごと), making the input format unambiguous.

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 specific verb ('查單一作品' – look up a single title) and a concrete resource, bracketed with the database scope (release dates and trailers). It is clearly a single-title lookup, though it does not explicitly contrast itself with the sibling screen__lookup_any_title, so an agent must infer the distinction.

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?

Usage is implied by '查單一作品' – one title per call – but there is no explicit when-to-use/when-not guidance and no routing to alternatives such as screen__list_titles or screen__lookup_any_title. The agent can infer intent but is not told how to choose among the many sibling screen tools.

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