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

Annotations already cover the safety profile (readOnlyHint true, destructiveHint false), so the description's burden is lighter. It adds real context beyond annotations: the exact field it reads ('GET ONLY the Item field'), the domain it governs, and the downstream systems that reference it (Store SKUs, loot tables, quest rewards, craft recipes). It does not describe return shape or pagination, but those gaps are minor for a read-only single-field getter.

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?

Front-loaded with the critical scoping phrase ('GET ONLY') and then compactly enumerates contents, defining characteristics, and cross-references. It is moderately long but each clause carries routing or domain value, with no filler sentences.

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?

For a read-only, single-parameter getter with no output schema, the description covers what the tool retrieves, what the data means, and which siblings to use instead. The absence of return-format detail is acceptable given there is no output schema to contradict and the annotations carry the safety contract.

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?

Only one parameter (title_id) and schema description coverage is 100%, so the schema already documents it fully. The description adds no syntax, format, or filtering nuance for the parameter, making the baseline 3 appropriate.

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+resource ('GET ONLY the Item field of TitlePublicConfigurationModel') and immediately scopes what the resource contains (catalogue of consumables/equipment/resources). It explicitly distinguishes itself from the sibling get_premium and get_character, so an agent can route without opening any 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?

Names two alternatives and the condition that selects them ('for premium-tier bundles use Premium; for character entities use Character'), which is clear routing guidance. It stops short of a full when/when-not matrix, but the cross-references are explicit and actionable.

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