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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint=false, so safety is covered; the description adds genuinely new behavior: deduplication across connected accounts, one site name possibly matching multiple properties, and the returned permission level and connection status. It does restate read-only, which duplicates annotations, keeping it below 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?

Front-loaded with the usage trigger and return summary; sentences are efficient and purposeful. The closing 'Read-only. Does not change anything' mildly duplicates annotation data but is brief.

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 rich annotations, a full output schema, and 100% parameter coverage, the description supplies what's needed to select and invoke the tool. Pagination via cursor is left to the schema, which is acceptable given the output schema exists.

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 both parameters (cursor, connection_id) are already documented in the schema. The description adds nothing about cursor pagination or connection filtering, 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?

States a specific verb and resource (list Search Console properties/sites) and clarifies it returns exact property IDs, distinguishing it from siblings like list_sitemaps or get_performance. The added detail about ID formats ('sc-domain:example.com', 'https://example.com/') makes the resource concrete.

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?

Gives clear trigger conditions: 'when the user asks which Google Search Console sites or properties they can access, or to find the exact property_id for a site.' No explicit when-not condition or named alternative sibling, so it falls short of a 5.

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