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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds genuinely new context: that this is a GET lookup whose purpose is to supply a required id to two mutation tools, which shapes how an agent sequences calls. It does not describe the returned fields beyond the id, keeping 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?

A single compact sentence plus the endpoint: the resource comes first, the cross-tool dependency second, and there is no padding. The parenthetical Portuguese synonym 'motivos' is a small but useful disambiguation for a Brazilian-domain API.

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 zero-parameter read-only lookup with full annotation coverage and no output schema, the description gives the agent everything needed to decide when to call it and why. The only gap is not hinting at the shape of each returned reason beyond the id.

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?

The tool takes no parameters, so there is nothing for the description to disambiguate. Baseline 4 applies; the schema is empty and the endpoint string adds only orientation.

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 the specific resource (cancel/reschedule reasons) and its role: supplying ids to feegow_cancel_appointment and feegow_reschedule_appointment. It is clearly distinguishable from siblings like feegow_list_appointment_statuses because the domain (motives for cancellation/rescheduling) is named. It stops short of a leading verb like 'List all...', but the intent is unambiguous.

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?

Explicitly names the two consuming tools whose required id comes from this list, which tells the agent exactly when to call it (before cancelling or rescheduling). No when-not-to-use guidance is given, but for a zero-param reference list that omission is minor.

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