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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered; the description adds the missing return contract ('product names, summaries and URLs'), which matters because there is no output schema. It does not mention result caps, pagination, or ranking behavior, which are the remaining behavioral unknowns.

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?

Two sentences, front-loaded with the verb and catalog scope, and the return shape is stated last where it belongs. The middle enumeration is dense but earns its place by improving semantic matching against product-family queries.

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 only two optional parameters and no output schema, the definition supplies what is otherwise absent: the catalogue scope and the returned fields. It stops short of describing result volumes or pagination, a minor but real gap.

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 100%, with both query and category documented including examples, so the description carries no additional burden. The description adds nothing about parameter semantics beyond the schema, so the 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 ('Search') plus the exact resource ('OptiLibra's catalog of optical networking equipment') and enumerates the product families covered, so an agent knows precisely what is searchable. It does not explicitly distinguish itself from get_product or request_quote, which keeps it off a 5.

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 only implied: the agent must infer that this is the discovery entry point and that get_product should be used once a product is identified. There is no explicit 'use this when…' or 'use X instead when…' routing guidance despite the presence of two siblings.

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