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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds only the raw endpoint path and a restatement of the required parameter; it says nothing about pagination behavior, rate limits, or how the rows are shaped beyond naming two metrics.

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?

Three short sentences, front-loaded with the result content, no filler. The trailing raw endpoint and the redundant 'event name is required' line are the only wasted space.

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 analytics query with no output schema, the description is minimally adequate: it conveys the resource and the two headline metrics. It omits return shape, pagination semantics (next_offset), and any routing against the many sibling statistics tools.

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 every parameter (dates, tz, sort, direction, limit, offset, search, domain_id) is already documented in the schema. The description adds no syntax or semantics beyond repeating that the event name is required, which is the baseline-3 case.

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: pages on which an event was triggered, including the metrics returned (visitors and views). This distinguishes it reasonably from pirsch_list_pages (all pages) and pirsch_get_event_breakdown, though it never names those siblings explicitly.

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 the prerequisite 'The event name is required', which the schema already enforces. There is no statement of when to use this tool versus pirsch_list_pages, pirsch_get_event_breakdown, or pirsch_list_events.

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