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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered structurally. The description adds only that the payload is a fixed catalog (packs, prices, delivery, payment, contact) but says nothing about caching, rate limits, or freshness that would go beyond the 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?

A single front-loaded sentence that names the action first and then the return contents; every listed item earns its place and there is no filler or redundancy.

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?

With no output schema, the description carries the burden of describing return values, and it does so comprehensively (pack tiers, dual-currency pricing, inclusions, delivery, payment, contact). It is complete for a read-only catalog lookup, though it omits any note on response format or how the lang parameter shapes the output.

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?

There is a single optional 'lang' parameter with 100% schema description coverage and an explicit enum with default, so the schema fully documents it. The description mentions 'supported languages' as returned content but adds no meaning about what the lang parameter controls, so baseline 3 applies.

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 (returns ISBN packs) and enumerates exactly what comes back: three pack tiers, USD and FCFA prices, inclusions, delivery delay, payment methods, languages, and contact. This content profile is clearly distinct from the sibling faq, get_order_link, and get_required_book_info, so an agent can route without opening a 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?

Usage is implied by the content: call this when a user asks about ISBN pack options or pricing. However, no explicit when-to-use statement, prerequisites, or comparison against the potentially overlapping sibling 'faq' is provided, leaving routing to inference.

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