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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the safety profile, and an output schema exists so return shape need not be spelled out. The phrase 'normalized grouped rows' adds a small amount of behavioral context about how results are shaped, but nothing about pagination, result size, or rate limits. With annotations carrying most of the burden, a 3 is fair.

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 efficient, though the brevity is partly under-specification rather than genuine economy.

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 are adequately covered, and the source page is identified. However, the undocumented offset parameter and absent usage routing leave gaps an agent would need to fill from the schema alone.

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?

The single 'offset' parameter has 0% schema description coverage, so the schema does not explain it and the description never mentions it either. With coverage this low the description should compensate by explaining pagination semantics, and it 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?

States a specific verb ('Returns') and a precise resource ('normalized grouped rows from Box Office Mojo's public domestic release-schedule changes page'), which distinguishes it from the plain boxofficemojo_calendar siblings by scope. It stops short of naming the alternative tools an agent might otherwise pick, so differentiation is implicit rather than explicit.

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?

The description gives no indication of when to use this tool versus boxofficemojo_calendar, boxofficemojo_calendar_date, or boxofficemojo_release. There is no mention of prerequisites, freshness, or the conditions that select this 'changes' feed over a dated calendar.

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