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

readOnlyHint=true already tells the agent this is a safe read, so the bar is lower. The description adds the underlying HTTP operation (GET /appointments) and the fact that the window frames the result set, but says nothing about pagination defaults, ordering, timezone handling, or result shape beyond what the annotations imply.

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?

Two compact sentences with the purpose and scope front-loaded and no padding. The trailing 'GET /appointments' is mildly redundant given the tool name, but it is the only thing keeping this from a 5.

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 9-parameter read tool with no output schema, the description covers purpose, scope, and filters but omits anything about pagination behavior, default ordering, or whether the date window is required in practice. Adequate to call, incomplete for an agent that must reason about results.

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 every one of the 9 parameters (start, end, page, per_page, include, subdomain, and the three id filters) is already documented in the schema. The description only restates the filter set at a high level, adding no syntax, defaults, or interaction rules (e.g. whether start/end are effectively mandatory).

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 the scoping dimension (date/time window) and the optional filter axes. That is enough for an agent to separate it from the singular nexhealth_get_appointment and from nexhealth_list_appointment_slots without opening either schema.

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?

The description establishes context ('in a date/time window, optionally filtered by location, patient, or provider') but never says when to prefer this over nexhealth_get_appointment or nexhealth_list_appointment_slots, and gives no exclusions or prerequisites. Usage is implied rather than directed.

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