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

Annotation Contradiction: the description explicitly says 'Apaga DEFINITIVAMENTE' and '(não tem desfazer)', which is destructive behavior, but annotations declare destructiveHint=false. This is a serious mismatch that could mislead an agent into treating the tool as a safe, reversible operation. The description otherwise provides excellent behavioral detail, but the contradiction with annotations forces a score of 1 per the rubric.

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?

The description is compact, front-loaded with the most critical warning ('Apaga DEFINITIVAMENTE'), and uses separated clauses to cover scope, alternative, quota cost, and bulk support. Every sentence adds distinct information with no fluff.

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?

The description covers the core behavior, limitation, alternative, cost, and batch support. Given the tool's simple input schema (no nested objects) and no output schema, what is provided is nearly sufficient. However, the annotation contradiction and the unexplained `account` parameter leave small but meaningful gaps in the total context an agent has.

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 0%, so the description must compensate for parameter meaning. It explicitly explains `comment_ids` for batched execution and implicitly covers `comment_id` as the singular deletion target, but it does not explain the `account` parameter at all. Some credit is given for the bulk-field clarification, but the description is incomplete for all parameters.

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?

The description uses a precise verb ('Apaga DEFINITIVAMENTE'), names the exact resource (a comment), and adds scope conditions (own channel or connected channel video). It clearly differentiates from youtube_comment_moderate, so an agent can distinguish the intent without ambiguity.

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 explicitly states when to use this tool (permanent deletion) and when to use the alternative (youtube_comment_moderate with `rejected` for hiding). It also specifies domain constraints and quota cost, giving the agent clear routing and prerequisites.

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