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

Annotations only carry readOnlyHint/destructiveHint, and the description adds substantial behavior beyond them: no indexing request is triggered, results reflect the indexed version not a live fetch, times are UTC, a 2,000 inspections per site per day quota, the full data_availability state vocabulary (including that no_rows and access_error do not mean zero), and an injection warning about externally-authored strings.

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?

Purpose is front-loaded and every sentence carries operative information (safety, fidelity caveats, timezone, quota, result states, injection handling). It is on the dense side, with the data_availability enumeration and injection note making it longer than average, but none of it is filler given the absence of an output schema.

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 supplies what the result contains, how to read data_availability, the timezone, and the quota constraint an agent needs. Combined with 100% schema coverage and read-only annotations, nothing material is missing for correct invocation.

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%, so all three parameters (including the site_url vs relative property distinction and the inspection_url containment rule) are fully documented in the schema. The description adds no parameter-level syntax or format detail, 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?

First sentence states a specific verb and resource (read the Google index status of one page in a Search Console site) and then enumerates exactly what is reported: indexed state, blocking causes (robots.txt, noindex, fetch errors), last crawl time, canonical URLs. Scope is narrowed to a single page, which cleanly separates it from site-wide siblings like google__search_console__performance.

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?

It gives clear context for use (inspect one page's index state) and explicit when-not statements: it never requests indexing and reports the index version rather than a live test. It stops short of routing the agent to a named alternative for other jobs (e.g. queries/impressions via google__search_console__performance), so no sibling is named.

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