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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds nothing beyond that — no note on whether it needs a title ID vs URL, no indication of pagination or coverage of the keyword list, so it fails to add value over the structured fields.

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 text is brief but that is under-specification rather than conciseness — a three-word fragment that carries almost no information. There is no front-loaded statement of what is returned or how to invoke it.

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?

An output schema exists, so return values need not be explained, but with two undocumented optional parameters and zero routing guidance the description is inadequate for correct invocation. It leaves the agent to guess between id and url and to infer the tool's role among the imdb_title_* siblings.

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?

Both parameters (id, url) are optional with 0% schema description coverage, so the description must compensate and does not. It gives no hint about the expected ID format (e.g. tt-prefixed IMDb ID), the URL shape, or whether id and url are mutually exclusive alternatives.

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 is a noun-phrase restatement of the tool name, 'IMDb title keywords,' with no verb and no scope. It does not distinguish this tool from the many sibling imdb_title_* endpoints (e.g. imdb_title, imdb_title_trivia, imdb_title_quotes), so an agent cannot tell what makes this one different without opening the schema.

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?

No when-to-use, when-not-to-use, or alternative is mentioned. The name implies 'fetch keywords for an IMDb title,' which is the only usage signal, and nothing routes the agent away from imdb_title or imdb_search when keywords are not the goal.

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