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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety and closed-world behavior are covered structurally. The description adds only the jurisdiction ('US') and a pricing note ('Free'), and says nothing about what the response actually contains or how large a listing may be. Beyond annotations it is essentially a restatement of scope.

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?

One short sentence with no filler; the scope constraint is front-loaded. The leading 'Free.' fragment is a pricing tag rather than purpose information, which slightly delays the substance.

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?

A simple, zero-required-parameter read tool with full schema coverage and annotations, so expectations are modest. However, with no output schema, the description should say what a caller receives (a list of works, titles, authors?) and whether it is a fixed yearly batch, which it does not.

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% and the single 'year' parameter already documents its 'Defaults to next January' behavior. The description's phrase 'of a given year' confirms the parameter is a single year rather than a range, but adds no format or boundary detail beyond the schema.

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 concrete resource and scope: works entering the US public domain on January 1 of a given year. This is a year-indexed listing, distinguishable from per-work checks like check_public_domain. It lacks an explicit verb ('lists'/'returns'), leaving the output shape to inference.

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, when-not-to-use, or alternatives are named, despite siblings check_public_domain, check_public_domain_full, and copyright_rules_for_year existing. An agent must infer that this is the year-batch view rather than the per-work lookup.

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