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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and external-source profile is covered. The description adds that rows are 'normalized' and come from a public chart, but says nothing about pagination (implied by the offset param) or result size limits. Under annotations, this is an acceptable but thin contribution.

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 front-loaded sentence with no filler. It is appropriately sized for the tool, though the brevity is partly the source of the documentation gaps rather than pure efficiency.

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 both input parameters are undocumented and there is no usage context for a chart that clearly has an 'area' dimension. Adequate at a minimum-viable level but not complete for a paginated, region-scoped listing tool.

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 'area' and 'offset', and the description mentions neither. 'area' presumably selects a market/territory and 'offset' paginates, but both are left entirely to inference, so the description fails to compensate for the coverage gap.

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?

Names a specific verb ('returns') and resource ('normalized movie rows from Box Office Mojo's public lifetime gross chart'), so the agent knows this is a chart-listing tool rather than a detail tool. However, it never distinguishes itself from close siblings like boxofficemojo_year_worldwide or boxofficemojo_date_domestic, which share the 'chart rows' shape.

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 exclusions, and no mention of sibling alternatives despite a dense boxofficemojo_* family. The agent must infer that this is the all-time cumulative gross chart versus the yearly/weekend ones.

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