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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, and the description reinforces rather than contradicts them. Beyond that it discloses genuinely useful behavior: per-list caps, default values, and the existence of *_total fields reporting the uncapped counts, so the agent knows the lists can be truncated. The final "Read-only" sentence is redundant with annotations but harmless.

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 scope statement is front-loaded and the parenthetical clauses pack defaults and exclusion rules without wasted words. The trailing "Read-only." restates an annotation hint and could be dropped, but overall density is high.

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 output schema, the description usefully sketches the return shape (two capped lists plus *_total counters) and the filtering rules. It does not describe what fields each person entry contains, which is the main remaining gap for an agent deciding whether this data is sufficient.

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 coverage is 0%, so the description carries the full burden and does so: it explains that 'days' defaults to 14 and is inclusive of today, and that 'limit' defaults to 5 and caps each list separately. It also implicitly scopes 'days' to the birthday list only, which the schema cannot convey. The explicit maximums (60, 50) are left to the schema.

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 opens with a specific framing ("Who needs attention") and names exactly the two resources returned: birthdays falling within a window and people whose keep-in-touch interval has elapsed. This distinguishes it immediately from action-oriented siblings like keep_in_touch_done or the general hr_list_people roster listing.

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?

It gives concrete inclusion criteria (only people with keep_in_touch_days set; snoozed and archived people excluded), which tells the agent when a person will and will not appear. It stops short of naming an alternative tool or stating a case where the agent should use something else instead.

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