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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered. The description adds only the verified-site precondition, saying nothing about rate limits, row-limit truncation behavior, or aggregation defaults, which is a modest value-add given rich annotations and an output schema.

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 sentence is compact and front-loaded with the action and payload. The trailing 'Tools revision: d80f65c0.' is pure noise that consumes a line without helping selection or invocation.

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?

Return values need not be documented because an output schema exists, but with 0% parameter coverage and three required parameters whose formats are non-obvious in Search Console, the definition leaves real implementation gaps. A short note on site URL and date formats would have made it complete.

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% across five parameters, so the description carries the full burden. It explains none of them — notably the required siteUrl format (domain property vs. full URL), the date string format, or what 'dimensions' accepts — leaving the agent to guess at invocation-critical syntax.

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 uses a specific verb and resource ('Query Search Console performance') and enumerates the returned metrics (clicks, impressions, CTR, position), which clearly separates it from siblings like gsc_inspect_url or gsc_list_sitemaps. It does not explicitly name those alternatives, which keeps it just short of a 5.

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?

The only usage signal is the implicit prerequisite 'for a verified site'. There is no statement of when to prefer this over gsc_inspect_url, paid_vs_organic, or site_index_audit, and no guidance on date-range limits or how to choose dimensions.

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