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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds that the catalog is 'live' and that results are validated slugs usable elsewhere, which is real context, but says nothing about pagination, result ordering, or how 'live' interacts with a closed-world catalog.

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 sentence with the action and resource front-loaded and the example slugs doing useful illustrative work. Nothing is padding.

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-shape explanation is unnecessary, and the tool is a simple read-only lookup. However, with two undocumented parameters and no explicit guidance on when to use it versus the conversion siblings, the definition leaves gaps an agent must guess at.

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 description coverage is 0%, so the description must carry the parameter meaning; it only weakly implies a search/filter capability through the verb 'Search'. The 'limit' parameter (default 50, max 100) and the exact matching semantics of 'search' are never mentioned.

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 ('Search') and resource ('live XLSX.now converter catalog') and shows the shape of the result (slug examples like xlsx-to-csv), so an agent immediately knows this is a discovery tool, not a conversion tool. No ambiguity against siblings such as convert_image_url or get_conversion_status.

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 usage is only implied: an agent can infer it should call this to obtain valid converter slugs before requesting a conversion, but the description never says so outright. No alternatives, exclusions, or conditions (e.g., when to skip searching and use a known slug) are given.

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