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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile needs no restating. The description adds real context with "aggregate" (pre-computed metrics, not raw rows) and "tenant-owned" (access is scoped to the caller's tenant), but it is silent on how the startDate/endDate window behaves when omitted or whether metrics are window-bounded.

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?

A single front-loaded sentence with no filler, and the verb plus scope arrive first. It is efficient rather than padded, though the extreme brevity leaves the gaps noted in other dimensions unaddressed.

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 an analytics tool with three parameters, zero schema descriptions and no output schema, the definition should describe the time window and what the aggregates represent. Instead it gives one sentence, leaving the date parameters and the metric semantics entirely undocumented.

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 0%: webinarId, startDate and endDate carry only format and pattern constraints, no semantic descriptions. The description never compensates, saying nothing about whether the date range is inclusive, what the default window is, or whether endDate is exclusive — all of which an agent would need to pass a correct range.

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?

Names a specific verb ("Read") and a specific resource ("aggregate conversion and engagement metrics"), scoped to "one tenant-owned webinar." That scope implicitly separates it from collection-level siblings, but it never names an alternative such as webinarstack.webinars.summary, so an agent must infer the boundary from the surname alone.

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?

Usage is only implied: "for one tenant-owned webinar" tells the agent this is per-webinar retrieval, not cross-webinar reporting. There is no explicit statement of when to prefer this over summary or interactions_get, and no precondition about the webinar needing to have completed or be live.

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