get_session_stats

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

With no annotations, the description carries full burden for behavioral transparency. While it indicates the tool returns 'summarized session statistics', it does not disclose whether the operation is read-only, destructive, or has other side effects. It also omits details like aggregation method, pagination, or data freshness. The parenthetical 'etc.' is vague.

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 a single sentence that efficiently conveys the core purpose with examples. It is front-loaded and uses minimal words. However, it could include additional structure (e.g., a note about filters or output) without being overly verbose.

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 moderate complexity (5 params, no output schema, no annotations), the description is adequate but not fully complete. It explains the basic purpose but lacks details like whether it returns aggregated data over a period or per session, and what 'etc.' includes. The schema covers parameters well, but the description could better clarify the nature of the output.

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?

Input schema coverage is 100% with descriptions for all 5 parameters. Per rules, baseline is 3 when coverage >80%. The description adds no additional parameter semantics beyond the schema; it only restates the general resource type ('for a website'). No parameter details are provided in the description.

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 the tool's purpose: 'Get summarized session statistics for a website (total sessions, unique visitors, etc.)' It specifies the action (Get), resource (summarized session statistics), and gives examples. This distinguishes it from siblings like get_sessions (which lists sessions) or get_stats (more general stats).

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 provides no guidance on when to use this tool versus alternatives. There are many sibling tools (e.g., get_sessions, get_stats, get_event_data_stats) with no explanation of when this tool is appropriate. The description lacks any 'when to use' or 'when not to use' context.

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