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, but the description adds nothing on top: no mention of pagination, whether the full cast/crew is returned, or whether crew categories are included. Given how little text there is, the description does not extend the structured data in any meaningful way.

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 trivially short, but this is under-specification rather than conciseness; nothing meaningful is front-loaded because nothing meaningful is said.

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 the description provides nothing for a two-parameter, ambiguous-input tool surrounded by many similarly named IMDb tools. An agent cannot reliably invoke it from this definition.

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 both parameters, and the description says nothing about 'id' vs 'url' — which to supply, whether they are alternatives, or what identifier format is expected. With zero coverage, the description had the full burden and met none of it.

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 credits' is essentially a restatement of the tool name and title, with no verb describing what is retrieved. It does not distinguish this tool from close siblings such as imdb_name_credits, imdb_title_company_credits, or imdb_title_episodes.

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 guidance about when to use this tool, what input form is expected, or which alternatives (name credits, company credits, title details) to choose instead. The agent is left to infer everything from the name alone.

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