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

Annotations already cover the read-only, idempotent, closed-world safety profile, yet the description still adds real behavioral context: geographic scope (Canada), what a result contains (sizes, today's CAD price with sales applied, price per mg, quantity breaks, stock, links). It does not discuss pagination or result-count limits, but that is a minor gap given annotation coverage.

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 sentences, front-loaded with what is searched, then what is returned, then the no-argument behavior. The commercial framing ('Deer Supply's') is minimal and every sentence carries operational information.

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 two-parameter, no-output-schema search tool whose annotations carry the safety profile, the description supplies everything needed: catalog scope, return fields, and default no-argument behavior. Nothing an agent needs to invoke it correctly is missing.

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 50%: query has examples in the schema, but the category enum is undocumented there. The description compensates by naming the catalog segments (weight loss, recovery, ancillary capsules) that map onto the enum values, and by clarifying that both parameters are optional via the no-argument listing case.

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 names a specific verb and resource ('Search Deer Supply's catalog') and enumerates the catalog scope (weight loss, recovery, ancillaries). It is clearly distinguishable from get_product or compare_weight_loss_medications in practice, but it never explicitly contrasts itself with those siblings.

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 one concrete usage rule — 'Call with no arguments to list everything' — which tells the agent how to enumerate. However, it offers no guidance on when to prefer this over get_product (single-item lookup) or compare_weight_loss_medications, leaving tool selection largely implied.

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