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

Annotations already declare readOnlyHint=true and destructiveHint=false. The description adds real behavioral context beyond that: the 31-day window cap, that host/provider gates and shared quotas constrain results, that availability is re-checked at booking time, and that no invitation is sent. It leaves the return shape unspecified, which keeps it out of 5 territory.

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 tight sentences, front-loaded with the action and scope, followed by constraints and the booking-time caveat. No filler; every clause carries information.

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 3-param read with no output schema, the description covers what is returned ('current slots'), the scoping constraints, and the key caveat about re-checks. The absence of any hint about return shape (slot granularity, counts) is a minor gap.

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 must carry semantics. It clarifies meeting_type_id must be an owned/active type and imposes the 31-day maximum on the window_start/window_end pair, a constraint absent from the schema. It does not describe date format or timezone handling, so not a 5.

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+resource ('Read current slots for one owned active meeting type'), scopes it to a bounded window, and constrains it to a single owned/active type. Distinguishes itself from booking siblings by naming the exact entity being read.

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?

Gives clear usage context: one owned active meeting type, window of at most 31 days, gates and quotas apply. It also clarifies this is a pre-booking read that sends no invitation, implicitly routing away from book_meeting. It does not name an explicit alternative tool, so it falls short of a 5.

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