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

With readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false already supplied, the description still adds meaningful context: this only works for one of the organization's verified websites, consumption is bounded by a monthly lookup allowance, and the response includes lookups used and allowed. The closing 'It changes nothing' reinforces the non-mutating profile without contradicting annotations. It does not disclose what happens when the allowance is exhausted or the domain is unverified, which keeps it short of a 5.

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?

Everything present is substantive, but it is delivered as one long nested sentence with two parentheticals, and the payload content (fields returned) is buried mid-sentence rather than front-loaded. The agent must parse the whole clause chain to extract the key facts: verified site required, quota-bounded, returns SERP detail. Restructuring into a short purpose sentence plus a return-contents sentence would earn a 5.

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?

There is no output schema, so the description must describe return values — and it does thoroughly, listing rank, top results and page types, People Also Ask questions, related searches, result types, and quota counters. Combined with the verified-website precondition and quota constraint, an agent has enough to call this correctly. It is only incomplete on edge behavior (unverified domain, quota exhausted) and domain-format expectations.

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?

The single domain parameter has 0% schema description coverage, so the description carries the burden — and it does partially, by establishing that the domain must be one of the organization's verified websites, which meaningfully constrains valid values. It does not specify the expected format (bare registrable domain, no scheme or path), leaving the agent to infer it from the regex pattern in the schema. Helpful but not fully compensating for the coverage gap.

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 resource and enumerates its contents precisely: the Google searches looked up for a verified website, each with the site's exact rank, top results and page types, People Also Ask questions, related searches, result types, and monthly lookup quota. It is distinguishable from sibling webops_searches (which appears to manage the search set) because it emphasizes 'the few searches Website Growth Ops looked up in Google's results' as retrieved data. The one weakness is structural: it opens with a prepositional phrase rather than a verb like 'Returns', so the agent must infer this is a fetch operation from the title and annotations.

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 a real usage rule — 'Public search results are context, never the source of a number in a finding' — which tells the agent how to treat the data downstream, plus the precondition that the site must be verified and lookups fall within the plan's monthly allowance. However, there is no explicit routing guidance against the obvious siblings (webops_searches to see the tracked query list, webops_pages for page-level data), and no statement of when this tool is the wrong choice. Usage is implied rather than stated.

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