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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds genuinely non-obvious behavior: detail is owners-only and exposes host names and IP addresses, the default window is 7 days, and start_date=19700101Z unlocks all time — none of which the annotations convey.

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 purpose and the mode enumeration, then defaults and scoping. The trailing raw URL template is dense but does encode the kind/distro/version/interval combinations compactly; nothing is wasted, though it reads as documentation-heavy.

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 10-parameter, read-only stats tool with no output schema, the definition covers modes, scoping, defaults, and the owners-only privacy caveat. Pagination behavior and the shape of the series output are left to the schema/agent inference, which is a minor gap.

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 coverage is 100%, so the baseline is 3, but the description adds meaning the schema lacks: how 'kind' maps onto the URL suffix, that version requires distro, and the trick for querying all time. These cross-parameter relationships raise it above baseline.

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+resource ('how often a repository was installed') and enumerates the three output modes (count, series, detail), immediately distinguishing it from the sibling download-statistics tool. An agent can tell what it gets without opening the schema.

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?

Explains when each mode applies ('count/series/detail', detail owners only) and the scoping conditions for distro/version plus the default and all-time date ranges. It does not name a competing sibling tool explicitly, but the selection guidance among modes is clear.

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