get_login_stats_by_hour

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

No annotations are present, so the description must carry the full burden. It mentions 'local time' and default/empty behaviors for date_from and date_to, but does not disclose rate limits, authentication needs, or whether the operation is read-only (implied by 'Get'). For a simple read tool, this is adequate but not comprehensive.

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 description is concise with a single purpose line and a two-item parameter list. Every sentence is functional, front-loaded, and free of fluff.

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?

Given the tool's simplicity (2 optional parameters, output schema present) and no annotations, the description covers purpose, parameter semantics, and defaults. It lacks explicit mention of timezone handling but 'local time' provides sufficient context for typical use.

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?

With 0% schema description coverage, the description adds essential meaning: date format (YYYY-MM-DD), default behavior for date_from (last 24h when omitted), and behavior for date_to (empty for all). This compensates well for the lack of schema descriptions.

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 clearly states 'Get login statistics broken down by hour (local time)', specifying the verb (Get), resource (login statistics), and breakdown dimension (hour). This differentiates it from sibling tools like get_login_stats (overall) and get_login_stats_by_client (by client).

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 description implies usage for hourly login statistics but does not explicitly state when to use this tool versus alternatives like get_login_stats or get_login_stats_by_client. No guidance on exclusions or when not to use is provided.

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