meli_update_item

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

Annotations already declare destructiveHint=true, readOnlyHint=false and openWorldHint=true, so the safety profile is covered. The description adds nothing beyond that: it never says whether 'changes' is a partial merge or a full replacement, what an invalid field does, whether the call is reversible, or that catalog items may require confirmation — despite the presence of a catalog_confirmed flag hinting at exactly such a hazard.

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 efficient sentence with the verb and resource front-loaded and no filler. It is perhaps too terse rather than padded, but nothing in it is wasted.

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, open-world mutation with a free-form nested object, 0% schema coverage and no output schema, the description is far too thin. The critical unknowns — merge vs replace semantics, the catalog_confirmed flag, and prerequisite flows — are left unaddressed.

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 carry the burden and does not. It lists example field names but no actual keys, types or nesting for the free-form 'changes' object, and it is silent on 'catalog_confirmed', whose meaning and effect on the call are impossible to infer from the schema alone.

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 ('Modifica') and resource ('campos de una publicación') and enumerates the updatable fields (precio, cantidad, estado, atributos, variaciones), so the agent knows exactly what the tool touches. It does not, however, distinguish itself from siblings such as meli_create_item, meli_update_description or meli_preview_item_changes.

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 when-to-use guidance, no preconditions, and no mention of the obvious alternative meli_preview_item_changes that exists among the siblings. The agent must infer entirely from the name when an update is appropriate versus a preview or a description update.

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