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

Annotations declare non-read-only, non-destructive, non-idempotent, non-open-world, but say nothing about what actually happens. The description fills that in: a calendar invite is sent to the person's own email, a booking_key comes back as the handle for later move/cancel, and the commercial terms (free, no deposit, no cancellation or no-show fee, max 3 moves, cancel anytime before start) are spelled out. That is concrete consequence-level disclosure well beyond the annotations.

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?

Front-loaded with the action, then prerequisites, then downstream handle, then terms — a sensible order with no filler. The sentence "The answer's booking_key moves (inite_move_call) or cancels (inite_cancel_call) it" is grammatically awkward and takes a second read, which is the only drag on an otherwise tight definition.

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 8-parameter mutation tool, the description covers the two things that matter and are not in structured form: the consent/ownership precondition and the refund/cancel policy that an agent may need to relay. An output schema exists, so return values need no explanation, and the one return detail that matters (booking_key) is still called out.

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 already 100%, so the baseline is 3, and the description does add cross-tool meaning: starts_at is not any ISO instant but one drawn from inite_slots, and topic is a service id from inite_services defaulting to diagnostic. It also constrains email semantically (the person's own, where the confirmation and invite land). Some of this restates the schema wording, which caps it at 4.

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 opening sentence names a specific verb and resource ("Book a call with the INITE team") and immediately scopes it with consent and the person's own email. Nothing in the sibling list (inite_cancel_call, inite_move_call, inite_slots, inite_services) could be confused for this, because the description explicitly assigns those jobs elsewhere.

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 pinned to prerequisites: starts_at must come from inite_slots, topic from inite_services, and the resulting booking_key routes to inite_move_call or inite_cancel_call. That is strong routing guidance. It stops short of an explicit when-not-to-book exclusion beyond the consent clause, which keeps it at 4 rather than 5.

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