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

The description adds no behavioral information beyond the annotations. It does not disclose side effects, reply behavior, account selection, thread targeting, or any permission requirements. Since annotations only provide limited hints, the description fails to carry the burden of behavioral transparency.

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 short, but this is under-specification rather than conciseness. It repeats the tool name and provides no actionable content, so the single sentence does not earn its place.

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?

Despite an output schema and a list of sibling tools, the description is completely inadequate. An agent cannot determine what the tool does, when to invoke it, or how to interpret its parameters, making the definition insufficient for correct selection and 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%, and the description provides no explanation of message_id, body, limit, reply_all, or from_account. An agent must infer the meaning of all five parameters from their names alone, which is insufficient.

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 only restates the tool name and adds the generic phrase 'Delegated Apple domain tool'. It does not state that the tool replies to the latest message in a thread or describe the action it performs, so an agent cannot determine purpose from the description beyond what the name already implies.

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 such as mail_reply_message or mail_compose_draft. The description provides no context about the intended scenario, prerequisites, or exclusions.

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