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

No annotations and no output schema, so the description carries the full burden. It discloses that results are grouped by month and that there is a category for undetermined (period-only) works, which is useful, but says nothing about read-only nature, return shape, result volume, or whether omitting month changes 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?

A single front-loaded sentence with a bracketed database label and no wasted clauses. Efficient, though the bracketed prefix is slightly redundant with the tool name.

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 one-parameter query tool with no output schema, the description covers the resource and the notable 'undetermined works' case. It is adequate but stops short of telling an agent what choosing vs omitting the month yields.

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?

With a single optional parameter at 100% schema coverage, the schema already documents the YYYY-MM format. The description's '依月份' confirms the month is the primary filter axis, adding minor meaning but no format or default behavior beyond the schema.

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+resource combination (monthly release/premiere calendar) scoped to movies, series, and animation, plus works with only a period announced. This lets an agent distinguish it from vague list tools. However, it does not explicitly contrast itself with close siblings like screen__release_countdown or screen__schedule_changes.

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 or exclusions. The agent can infer it retrieves a monthly calendar from the phrasing '依月份', but nothing states when this tool should be chosen over screen__release_countdown, screen__schedule_changes, or screen__list_titles.

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