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

No annotations are provided, so the description carries the behavioral burden. It discloses that each change includes a source and lists change types, but it does not state that the tool is read-only, whether results are comprehensive or filtered, how results are ordered, or whether pagination applies. For a no-parameter lookup tool, this is adequate but thin.

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 description is a single compact sentence, front-loaded with the database scope and then the specific schedule-change criteria. Every element earns its place: category, change types, and source attribution are all relevant and non-redundant.

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 gives enough context to understand that the tool returns works with schedule changes and that each change has a source. It could specify return fields or list structure, but for a no-parameter read-only endpoint it is reasonably complete.

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?

The tool has zero parameters and 100% schema description coverage, so parameter semantics are not a meaningful concern. The description does not need to explain inputs, and the baseline for zero parameters is 4.

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 identifies a specific resource scope: movie/TV/animation release-date and trailer database records for titles with schedule changes, including delays, early releases, and distributor changes. It does not use an explicit action verb like 'list', but the resource and subset are clear enough to distinguish it from general release-calendar or title-lookup tools. It lacks explicit sibling differentiation, so it is not a 5.

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: the tool is for retrieving works that have had schedule changes, with each change sourced. However, there is no explicit when-to-use guidance, no when-not-to-use guidance, and no reference to alternatives such as screen__release_calendar or screen__release_countdown. This makes it minimum viable rather than strong.

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