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

Annotations already declare readOnlyHint=true, so safety needs no explanation. The description adds genuinely new context annotations cannot carry: results are ordered by id, timestamps are UTC, and each row carries the per-patient status plus cancellation reason and invoice id. It omits default page size and the archived-record default, which keeps it short of a 5.

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 short fragments: ordering and returned fields first, filtering second, endpoint last. Every clause carries information and nothing is repeated from the schema verbatim.

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 correctly takes on the job of naming the returned fields and ordering, which is what an agent needs to decide whether to call it. It stops short only on pagination behavior and the archived-inclusion default, which are partly recoverable from the schema.

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 100%, so all twelve parameters are already documented, making 3 the baseline. The description adds a little by naming the meaningful filter axes and enumerating status values, but silently drops update_gt, status_update_gt/lt, include_archived and the id_gt/id_lt paging semantics, so it neither adds nor compensates much.

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 and resource ('List appointments'), plus id-ordered pagination and the fields returned, which is well beyond a bare title restatement. It does not, however, distinguish itself from splose_get_appointment or splose_find_free_slots, so an agent must infer the boundary from the sibling names 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?

Listing the filter dimensions ('time window, patient, practitioner or status') implies when to reach for this tool instead of a single-record fetch, but usage is only implied. There is no explicit when-not, no pointer to splose_get_appointment for a single record, and no guidance on using id_gt/id_lt for paging.

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