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

The annotations already declare destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the safety profile is covered. The description adds nothing beyond that: it doesn't say the removal is irreversible, that admin privileges are required, whether the removed participant is notified, or what happens if the participant isn't in the group. With annotations present the bar is lower, but zero added context earns only a 2.

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 tight sentence with no filler, front-loading the action and resource. It is well-formed but too thin to earn a 5 given how much decision-relevant information is absent.

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?

This is a destructive mutation with no output schema, and the description never covers authorization requirements, failure modes, or irreversibility. For a group-membership removal where a wrong call has real social consequences, that leaves material gaps for the agent.

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% and the schema even supplies the expected chat ID format (79001234567@c.us). The description adds no parameter meaning beyond the schema, so the 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: removing a participant from a WhatsApp group. An agent can tell it apart from whatsapp_add_group_participant by polarity alone, but the description doesn't distinguish it from nearby siblings like whatsapp_remove_group_admin (which revokes admin status, not membership) or whatsapp_leave_group.

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?

No guidance on when to use this versus whatsapp_remove_group_admin or whatsapp_leave_group, and no stated prerequisites such as the caller needing to be a group admin. The agent must infer all usage conditions from the name.

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