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

Annotations already indicate it is not read-only (readOnlyHint=false) and not idempotent/idempotentHint=false). The description adds the HTTP method and endpoint, and the main content of `data`, but does not disclose side effects, auth requirements, or rate limits. Since annotations cover the basic mutation profile, this is adequate but not enriched.

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 a single sentence that front-loads the primary action, endpoint, and main parameter content. It is concise and to the point with no redundancy.

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 there is no output schema, the description should explain the return value or consequences of the operation. It also leaves the full structure of `data` and the purpose of `account` unexplained. For a create tool with a complex payload, this is insufficient for an agent to confidently use it.

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 0% schema description coverage, the description must compensate. It partially explains the `data` parameter (client, items, payment condition) but does not clarify its format (likely a JSON string) or the `account` parameter at all. The description fails to give meaningful semantics beyond what the parameter names imply.

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 explicitly states it creates an order via POST /v2/pedidos, with `data` containing client, items, and payment conditions. This clearly distinguishes it from sibling tools like mercos_update_pedido or mercos_list_pedidos. However, it lacks the specificity of naming the exact resource or operation beyond 'includes an order', which is slightly vague.

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 guidance on when to use this tool versus alternatives. It does not mention any exclusions, prerequisites, or alternative tools for related operations. The usage is only implied by the name and endpoint.

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