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 genuine value beyond that by disclosing the return contents (price, description, audience, store links) and a privacy trait — search terms are recorded without personal data. That recording behavior is non-obvious and worth surfacing.

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 the action and immediately followed by illustrative examples that do real disambiguating work. The closing privacy note is short and non-redundant, so almost nothing is wasted.

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 compensates by enumerating returned fields, giving an agent enough to know what it will get back. For a two-parameter read-only search that is largely sufficient; only the max_results behavior and empty-result handling are left unaddressed.

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 50%: 'query' is documented as plain English, but 'max_results' carries only numeric constraints with no prose meaning. The description does add value by demonstrating the expected query style through examples, but it says nothing about result-count control or what happens at the default of 5.

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 ('Search Agent Bazaar for a finished product') and backs it with four concrete query examples spanning domains. It is clearly a catalog search rather than an item fetch or a free-calculator listing, though it never names the sibling tools to reinforce that boundary.

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 'fits a task' plus the example queries, so an agent can infer when to reach for it. However, there is no explicit guidance on when NOT to use it or how it relates to siblings like list_free_calculators or get_item, which is a real ambiguity since a free calculator could plausibly appear in a catalog search.

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