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

Annotations only say readOnlyHint=false and openWorldHint=true; the description adds real value on top by disclosing the editToken authorization requirement and the non-obvious side effect that token storage may return a new id, forcing bookmark updates. It stops short of describing failure modes (e.g., stale token, duplicate item) or the response shape.

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?

Three dense sentences, front-loaded with the action and the prerequisite, with no filler. The telegraphic 'name/title plus ...' phrasing is compressed to the edge of ambiguity, and the OpenAPI mapping is minor but useful cross-reference.

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 mutating tool with no output schema and sparse schema descriptions, the definition covers the essentials but leaves gaps: one parameter is undocumented, there is no indication of what a successful call returns beyond a possible new id, and no error behavior. Adequate to invoke, not complete.

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 compensate, and it does: it names the body fields (name/title, asin, url, searchKeywords, catalogId), gives a format hint for url ('pasted /dp'), and explains where editToken comes from. Gaps remain — 'emoji' is never mentioned and the semantics of searchKeywords (fallback resolution?) are unstated.

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 and resource ('Add an item to a desk board') and enumerates the identification fields that make up the body, so an agent knows this appends a single item to an existing board. It is distinguishable from read-side siblings like get_desk_board or resolve_product, though it never clarifies its boundary against create_and_fill, which plausibly also adds items.

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?

'Requires editToken from create' gives a hard prerequisite and 'asin, url (pasted /dp), searchKeywords, or catalogId' implies the agent should supply one identifying field. However, there is no explicit statement of when to pick this over create_and_fill, nor whether the identifier fields are mutually exclusive or prioritized.

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