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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds that results carry permission levels, but says nothing about how many sites come back, ordering, or whether identifiers returned feed sibling tools.

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 short sentences, zero filler, with the core definition first and the routing hint second. Nothing could be removed without losing information.

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 simple read-only listing tool with full schema coverage and no output schema, this is close to complete. The one gap is not telling the agent that the returned site identifiers are what the other gsc_* tools expect as input, which matters given its stated 'start here' role.

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% with two enums fully documented, so the schema does the heavy lifting on detail, folder and language. The description adds no meaning beyond that; 'permission level' describes output rather than any of the three inputs, so the baseline of 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?

States a specific verb and resource (list Search Console sites) plus a scope qualifier (enabled for AI, includes permission level), which separates it from metric-oriented siblings like gsc_performance or gsc_queries. The phrase 'enabled for AI' is slightly ambiguous about the underlying filter, keeping it 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?

'Start here for SEO / organic search questions' gives clear entry-point context for when to reach for this tool. It stops short of naming the downstream alternatives (gsc_performance, gsc_queries, gsc_breakdown) or stating exclusions, so no explicit when-not guidance.

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