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

Annotations already indicate this is a write operation (readOnlyHint: false) and not idempotent/destructive. The description adds value by disclosing bulk execution capability, which is a behavioral trait not captured in annotations. It does not elaborate on error handling, partial failures, or side effects, but the annotation coverage lowers the burden; a 3 is appropriate for the additional bulk context.

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 comprises two very concise sentences: the first states the purpose, the second adds bulk support. There is no fluff, every word contributes. It is front-loaded with the primary action, making it easy to parse quickly.

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?

Given the complexity (6 parameters, no output schema, minimal annotations), the description is too sparse. It omits meaning for 'unsafe' and 'account', does not discuss error behavior, atomicity of bulk operations, or any prerequisites (like authentication). For a mutation tool, this level of completeness is inadequate for an agent to use reliably without additional investigation.

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?

With schema description coverage at 0%, the description must compensate. It explains 'texto' (text) and 'checked' parameters, and mentions item_id and item_ids for bulk. However, it leaves 'unsafe' and 'account' completely unexplained, and does not clarify relationships between parameters (e.g., whether item_ids replaces item_id). This is insufficient for a tool with 6 parameters, even if the core ones are touched.

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 clearly states it updates text and/or checked status of a checklist item, using the Portuguese verb 'Atualiza' (updates) and specifies the resource as 'item de checklist'. It distinguishes from siblings like add/delete by focusing on update functionality and mentions bulk support via item_ids, which is unique among sibling tools.

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 provides clear context for when to use the tool: to update text/checked status. It explicitly mentions bulk support ('Bulk support: accepts item_ids for batched execution'), which guides usage for multiple items. However, it does not explicitly state exclusions or alternative tools, so it lacks a strong when-not-to-use directive.

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