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

Annotations already declare readOnlyHint=false, and the description additionally adds '[write, altera dados]' to reinforce the writing nature. It also surfaces the POST method and the bulk batch behavior, which adds the context beyond the annotations. No contradiction exists, and it is richer than the annotation-only safety profile.

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 has a front-loaded core sentence with the verb, resource, and endpoint, followed by the write tag and a concise bulk note. Every sentence earns its place. Slight credit loss for not mentioning the missing parameter semantics, but the structure is optimal for what is included.

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 write tool with no output schema and 4 parameters, the description covers only ID selection and bulk mode but omits the essence of message content (`body`) and account scope (`account`). Without those, an agent cannot craft a correct request, especially with 0% schema coverage. The overall behavior is incomplete for reliable invocation.

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 sense. The description only addresses `id`/`ids` (via 'Bulk' and the endpoint), but leaves `body` and `account` entirely meaningless. An agent cannot reason about what `body` should contain (message text) or what `account` refers to (tenant context).

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 specific verb and resource: 'Enviar mensagem para uma conversa' (send a message to a conversation), and reinforces it with the exact POST endpoint. It clearly distinguishes from sibling tools like datacrazy_conversations_messages_list, which is the read counterpart.

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?

Usage context is implied by the name (create vs list) and the endpoint. The 'Bulk support' note gives a clear hint for when to use the `ids` batch capability, but the description does not explicitly state exclusions or refer to alternatives, so the agent must infer the boundary between send-message and list-messages.

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