Mail Get Thread

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

The annotations declare readOnlyHint and idempotentHint, but the description adds no behavioral context beyond that. It does not mention pagination, thread ordering, permissions, or any other runtime behavior, so it offers minimal transparency beyond the structured annotations.

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 brevity here is under-specification, not conciseness. It is a single boilerplate sentence that conveys no useful information and does not earn its place as a functional description.

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?

Even though an output schema exists and annotations cover safety, the description leaves out essential information such as what constitutes a thread, how message_id is interpreted, and how limit affects results. An agent would have to infer the tool's entire behavior from its name and schema.

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?

The schema description coverage is 0%, and the description does not compensate by explaining what message_id or limit mean or how they affect the returned thread. The only available meaning comes from the parameter names themselves, 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's name and says it is a 'Delegated Apple domain tool' exposed through Apple-Tools-MCP. It does not state that the tool retrieves a mail thread or describe any specific verb and resource beyond the title. This is essentially a tautology with no functional detail.

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 mail_get_thread versus siblings like mail_get_message or mail_search_messages. The description provides no context, prerequisites, or exclusions, so an agent cannot determine from the description alone when this tool is the right choice.

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