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

Annotations declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. Beyond that, the description adds nothing: it does not say whether company credits are returned as a flat list, require pagination, or which companies appear (production, distribution, special effects).

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?

It is short, but the single fragment is under-specified rather than concise. It is not front-loaded with a verb or actionable information.

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-value explanation is not required. However, for a zero-coverage two-parameter tool whose id/url semantics are non-obvious, and with no usage guidance, the definition is not sufficient for an agent to call it correctly.

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 description coverage is 0% for two parameters (id, url). The description mentions 'title' but does not explain whether 'id' is an IMDb title ID (tt-prefixed), whether 'url' is an alternative to id, or how the two interact. With zero schema coverage, the description must compensate and does not.

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 'IMDb title company credits' is a noun phrase that names the resource (company credits for a title) but uses no verb and gives no sense of scope. It does distinguish the tool from siblings like imdb_title_credits (people credits) and imdb_title_box_office, but only by implicit domain knowledge.

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 guidance, no alternatives, no prerequisites. There are 20+ imdb_* siblings with closely related names (title_credits, title_trivia, title_awards) and the description provides no routing help at all.

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