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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds value by naming the returned fields, but says nothing about ordering, pagination behavior, or empty-result handling beyond what the schema already implies (default 20, max 100).

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 identity and return shape front-loaded. The closing usage sentence is somewhat redundant with the opening but adds a purpose cue, so waste is minimal.

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 5-parameter, all-optional read tool with no output schema, the description covers what is listed and what fields come back. Ordering and result-shape detail would be nice but are not essential given full schema coverage and annotations.

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% — every parameter (from, to, limit, status, contact_phone) is documented in the schema including ISO example and enum values. The description's mention of "horário" and "status" only echoes those filters, so baseline 3 applies.

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 ("Lista agendamentos registrados no sistema (CalendarBooking)") plus the fields returned (evento, cliente, horário, status), so an agent knows exactly what it gets back. It does not explicitly contrast with a sibling, though no other booking-listing tool exists in the sibling set.

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?

"Use para consultar a agenda de atendimentos" gives an implied usage context but never states when not to use it, nor names any alternative tool. Adequate but thin for a list tool in a large sibling catalog.

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