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

Annotations already declare readOnlyHint and idempotentHint, so the safety profile is covered and the description doesn't need to repeat it. The description does add useful content beyond that, spelling out which aggregates are returned (per-tab counts, unseen count, personal count) and scoping to 'active' insights, though with no output schema present it could have described the shape more concretely.

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 sentence with no filler, front-loading the verb and the scope before enumerating the returned counts. Nothing in it is redundant with the name or title.

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?

With no parameters and no output schema, the description carries the burden of conveying the return contents, and it does so by listing the three count categories. What's missing is guidance on how this fits alongside the other insight and team-summary 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?

The tool takes zero parameters, so the baseline is 4; there is nothing for the description to disambiguate. The implicit scoping to the authenticated user's team is a mild plus, as it tells the agent the tool needs no team identifier.

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 names a specific verb and resource ('Get an aggregate summary of active insights') and enumerates what the summary contains: per-tab counts, unseen count, and personal insight count. It implies team scope, distinguishing it loosely from get-my-insights-tool, but never explicitly contrasts with the closely related siblings (get-my-insights-tool, get-team-overview-tool).

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?

There is no statement of when to call this instead of get-my-insights-tool or get-team-overview-tool, and no prerequisites or exclusions. Only the phrase 'authenticated user's team' hints at the applicable context, leaving the routing decision entirely to inference.

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