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

Annotations already mark it as non-read-only and open-world; the description adds valuable behavior by noting the editToken requirement and that token storage may return a new id requiring bookmark updates. It does not cover invalid-token or duplicate-item behavior, but it adds meaningful mutation context beyond annotations.

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?

The description is compact, front-loaded, and mostly waste-free. The 'OpenAPI: addWishlistItem' tail adds little for an agent, and the fragment style is terse, but overall it is appropriately sized.

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 9-parameter mutation with low schema description coverage and no output schema, the description covers the key precondition and token-rotation side effect. It still leaves gaps around the emoji parameter, identifier selection rules, and full return/error behavior.

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 only 22%, so the description must carry significant parameter meaning. It identifies name/title plus asin, url, searchKeywords, or catalogId, and gives a format hint for url, but it omits emoji and does not clarify identifier exclusivity or optionality.

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?

The description states a specific verb and resource: add an item to a Mother's Day wishlist. It is clear enough to distinguish from create_wishlist, but it does not explicitly route against siblings such as create_and_fill.

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?

It gives a precondition, 'Requires editToken from create,' which helps frame usage. However, it does not state when to use this tool instead of create_and_fill or other sibling tools, leaving alternatives implicit.

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