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

Annotations already cover safety (readOnlyHint=true, destructiveHint=false, openWorldHint=true), and the description adds genuine context beyond them: a concrete quota of roughly 2,000 inspections per property per day, which affects how an agent should batch calls. It does not mention auth/scopes or that inspection data can be stale for rarely-crawled URLs, so it falls short of fully rich disclosure.

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?

Two sentences, both front-loaded and information-dense: the first states scope plus the exact data returned, the second states the operational limit. No filler or redundant restatement of the name or 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?

For a three-parameter read tool with a full schema and an output schema, the definition supplies what is needed to call it correctly: single-URL scope, the property-membership requirement, and the rate limit. The only gap is that it does not reference the output shape or handling of invalid/unindexed URLs, which the output schema largely covers.

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 each of the three parameters is already documented in the schema, including the exact property formats and the constraint that inspection_url must belong to the property. The description adds no parameter-level meaning beyond that, which is the expected baseline when the schema does the work.

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 verb and resource ('Inspect one URL in Google's index') and enumerates the returned facets: coverage/indexing state, last crawl, canonical, robots.txt, mobile usability, and rich results. That enumeration effectively separates it from the sibling gsc_search_analytics, which deals with aggregate query data, though no sibling is named outright.

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 only implied: 'Inspect one URL' signals single-URL scope, and the quota note hints it is a limited, per-URL operation. There is no explicit when-to-use versus gsc_search_analytics or seo_opportunities, and no stated prerequisite that the property must be verified in Search Console.

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