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, yet it only reveals the default-query behavior. It says nothing about what the response contains (day count, date, trailer link), how unknown titles are handled, or any rate/permission constraints. For a tool with zero annotation coverage this is a meaningful gap.

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 compact sentence with the database bracket front-loaded and the default value at the end. Nothing is wasted, though the bracketed label is somewhat boilerplate rather than informative.

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 one-optional-parameter lookup with no output schema, the description conveys purpose and the default, which is the minimum an agent needs. It is missing sibling differentiation (release_calendar, get_title) and any indication of the return shape, which matters since there is no output schema to lean on.

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 parameter is named only 'q', so the schema adds no meaning. The description indirectly implies the parameter is a work title (the parenthetical about the default Avengers title), which is some compensation, but it never states the expected format (title string? alias? language?) or what happens when it is omitted or unmatched.

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: it computes how many days remain until a film/show/animation releases or premieres, and identifies itself as a release-date/trailer database. This is clearly distinguishable from most siblings. It does not, however, distinguish itself from the near-identical games__release_countdown or from screen__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?

Usage is implied by the phrasing ('how many days until release'), and the parenthetical tells the agent the query defaults to a specific title if none is supplied. There is no explicit statement of when to pick this over screen__release_calendar, screen__get_title, or games__release_countdown, and no exclusions or prerequisites.

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