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

Annotations declare readOnlyHint=false and openWorldHint=true, and the description usefully explains why: results are 'Saved in the user's Puley history,' disclosing the write-like side effect the annotations hint at. It also discloses that results are country-localized and ordered, which is behavior beyond the structured fields, though rate limits or freshness/caching behavior remain unstated.

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?

The core capability and return fields are front-loaded in the first clause, and every subsequent fragment adds a parameter or scope detail. The sentence is somewhat run-on, but there is no filler or redundant restatement of the title.

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 does the right thing by enumerating the returned fields and their ordering. It nonetheless leaves gaps an agent would hit in practice: no pagination path (the more_results sibling exists but is never referenced), no site-parameter format, and no indication of what an empty or failed lookup returns.

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 0%, so the description must carry parameter meaning. It does clarify query, site ('a website to find in the results'), the 3–30 range for limit, and implicitly the country parameter via 'as a searcher in that country sees them.' It still leaves the site format (domain vs URL) and default behavior unnamed, so compensation is partial.

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 concrete verb+resource (Google results for a search) and specifies the returned shape in order (title, site, snippet, link), plus the rank-tracking angle. It is clearly distinct from generic siblings like read_site or find_news, though it never explicitly contrasts itself with the closest alternative, more_results.

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 'as a searcher in that country sees them, and where a site ranks among them' — i.e., use this for localized SERP inspection and rank checks. However, there is no explicit when-not guidance, no mention of when to switch to more_results for pagination, and no prerequisites stated.

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