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

Annotations already establish readOnlyHint, destructiveHint=false and openWorldHint=false, so safety is covered. With no output schema, the description usefully discloses the shape of the aggregate results (the specific metrics returned), which is the key behavioral fact an agent needs here; it omits only auth/rate-limit context.

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 tight sentences, front-loaded with the metric list, with zero filler. The metric enumeration is dense but each item carries real information about the return payload, so it earns its length.

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?

All parameters are documented, annotations cover the safety profile, and the description compensates for the missing output schema by listing the returned aggregates. Only the relationship to the similar get_account_overview sibling is left unexplained.

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 the three optional parameters (since, until, space_id) are already fully documented with examples. The description adds only a loose 'space and date range' phrasing, which does not extend the schema's meaning. 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?

The description enumerates exactly what the tool computes (counts by status/type/source/month, average rating, rating distribution, favorites, imported count, abandoned drafts), so the resource and operation are unambiguous. It does not, however, differentiate itself from the somewhat similar get_account_overview sibling, leaving the agent to infer the distinction.

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 guidance is 'Optional space and date range,' which is parameter information, not usage guidance. There is no statement of when to reach for this aggregation tool versus list_testimonials or get_account_overview, and no exclusions.

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