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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered; the description adds that the page is public (no auth implied) and that results paginate in 100-row pages with offset advancing. It does not describe rate limits or failure modes, but for a read-only listing this is solid added context.

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?

Three tight sentences, front-loaded with the operation, then the input constraint, then pagination, then the discovery alternative. No filler.

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 a 100%-covered schema, rich annotations, and an output schema, the description supplies everything else the agent needs: input exclusivity, paging behavior, and the sibling to use for identifiers.

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 100% so the baseline is 3, but the description adds the crucial exclusivity constraint (exactly one of id/path/url) and describes how sort/sortDir/offset interact with paging — semantics the schema alone does not express.

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?

States a specific verb and resource ('List release rows from a public Box Office Mojo genre page'), clearly distinct from sibling discovery tools like boxofficemojo_genres and from other boxofficemojo_* endpoints. An agent can pick this tool 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?

Explicitly states the mutual-exclusion rule ('Pass exactly one genre id, path, or URL') and routes the agent to boxofficemojo_genres to obtain identifiers. Both the how and the where-to-find-inputs conditions are named.

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