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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered structurally. The description adds only the site-scoping note, and says nothing about latency, rate limits, or that suggestions are non-authoritative typeahead output; with annotations carrying the load, this adds only marginal context.

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 tightly-worded sentence with no filler, front-loaded with the verb phrase and the scope. It is efficient, though its brevity also reflects the thinness of the content rather than disciplined editing.

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, complete parameter documentation, and annotations are all present, so the core contract is covered, and the description need not explain return values. What is missing is the routing context (suggest vs. search/product) that an agent needs to select this tool among its many siblings.

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 100% with clear per-parameter descriptions (q required, limit default 10/max 20, types enum of product/collection/query), so the schema fully documents inputs. The description adds no additional parameter meaning, which matches the baseline 3 when the schema does the heavy lifting.

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 states a verb-resource pair ('predictive search suggestions') and anchors it to a specific site ('pinned to https://www.ohpolly.com'), which is more than the bare name provides. However, it does no work to distinguish this from its large sibling family of ohpolly_* endpoints (products, collections, product) or from the many other *_suggest endpoints; an agent still has to infer that this is a typeahead/autocomplete tool.

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?

There is no statement of when to reach for suggestions versus a full search or product lookup, and no alternatives or exclusions are named. The only implicit guidance is the site pin, which does not tell an agent when this tool is the right choice.

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