mail_catchall_add

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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It only says 'Create', implying a mutation, but does not state what happens to an existing catchall, whether the operation is idempotent, what side effects occur, or whether privileges are required. This is a meaningful gap for a write operation.

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, short sentence that is easy to parse and immediately states the core operation. It contains no filler or redundant content. The main weakness is that its brevity leaves out important context, but it is appropriately front-loaded.

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?

The tool has no annotations, no output schema, and a loosely constrained nested params object, yet the description only states the action. It does not explain how server_id, source, and destination should be used, what a catchall's behavior is, or how this relates to other mail tools. An agent would lack enough context to invoke this tool reliably.

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 input schema already describes both parameters: client_id as 'Client ID' and params as 'Catchall params (server_id, source, destination)', with 100% schema description coverage. The tool description adds no parameter-level meaning beyond the schema. The nested params object is still vague due to additionalProperties: {}, but the schema itself provides the basic semantics.

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 states a clear verb ('Create') and a specific resource ('a catchall for a mail domain'), which distinguishes it from the many mail alias and forward tools in the sibling list. It is concise and directly conveys the operation. However, it does not explain what a catchall functionally does, leaving some ambiguity about its mail-routing behavior.

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?

No guidance is given about when to use this tool versus alternatives like mail_alias_add or mail_forward_add. There is no mention of prerequisites such as an existing mail domain being required. The user must infer usage entirely from the tool name and sparse description.

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