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

Annotations already declare readOnlyHint, openWorldHint, and non-destructive, so safety is covered. The description adds genuinely new behavioral context: it is free and rate-limited, and results are "live" autocomplete-style rather than cached. This is useful operational detail an agent cannot get from the structured fields.

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 terse sentences, front-loaded with the purpose, followed by usage and constraints. Efficient overall, though the leading fragment "Search Suggestion Explorer" is redundant with the tool title and occupies the highest-attention slot without adding 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, read-only lookup tool with annotations covering safety and full schema coverage, the description supplies everything needed to invoke it correctly. It does not describe the shape of returned suggestions, but with no output schema and a hint that results are autocomplete-style, that gap is minor.

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%, and both parameters (q as a seed phrase with a minimum length, deep as a widening flag) are already well documented in the schema. The description's "for a phrase" echoes q but adds no syntax, format, or usage nuance for either parameter, 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?

The description states a concrete purpose – "Live autocomplete-style suggestions for a phrase" – which is a specific output type, not a restatement of the name. The opening "Search Suggestion Explorer" is essentially a renamed title and adds nothing, but the second sentence carries the real meaning. No sibling overlap exists among the listed tools, so differentiation isn't required.

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?

"Use it before picking a title or keyphrase" gives an explicit when-to-use trigger tied to a workflow step. There is no when-not guidance or named alternative, but the sibling list contains no competing suggestion/keyphrase tool, so the omission is low-risk.

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