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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=true, and openWorldHint=true, so the safety profile is covered. The description adds nothing beyond that — it doesn't say what happens to a non-member, whether partial failures roll back, or how the idempotent behavior manifests.

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 well-formed sentence with no filler, and the action is front-loaded. It is arguably too terse for a four-required-parameter mutation, so it is efficient rather than optimally sized.

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 destructive-capable group mutation with no output schema and half its parameters undocumented, the description omits error behavior, permission requirements, and the fate of the removed numbers. Annotations cover only the safety hints.

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 only 50%: profile_id and phone_number_id are documented, but group_id and phone_numbers are bare. The description loosely implies a group identifier and a list of numbers but supplies no format, hashid, or E.164 syntax guidance to compensate for the gap.

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 (remove) and resource (phone numbers from a WhatsApp group), which cleanly contrasts with the sibling whatsapp_group_participants_add. It does not, however, explicitly name alternatives or scope limits beyond the operation itself.

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?

There is no statement of when to use this tool versus whatsapp_group_participants_add or whatsapp_users_block, no prerequisites, and no note on required permissions or group-admin status. Usage must be inferred entirely from the name.

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