meineba_postfach_attachment

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

Annotations declare readOnlyHint=false, destructiveHint=false, openWorldHint=false, so the write-local-file aspect is already signalled by structured data. The description usefully adds that the file is created with mode 0600, a real behavioral detail beyond the annotations, but omits whether it overwrites an existing file or what happens on write failures.

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?

A single front-loaded sentence that states action, target, destination, and file-permission behavior with zero filler.

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?

An output schema exists, so return values need not be explained, but with three required parameters at 25% coverage the description should at least indicate that message_id and attachment_id are obtained from listing/reading a Postfach message. That context is missing, though the core invocation path is clear.

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 only 25%: save_to is documented, but message_id and attachment_id are bare strings and folder is only an enum with a default. The description adds no meaning about where message_id/attachment_id come from or what the folder default implies, so it fails to compensate for the coverage gap.

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 specific verb (Download) and resource (attachment of a Postfach message) plus a concrete example artifact (Bescheid as PDF), which clearly separates it from siblings like meineba_postfach (listing) and meineba_postfach_read. It does not explicitly name an alternative tool, but the purpose is unambiguous.

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 when-to-use guidance, no prerequisites, and no mention of the alternative tools for accessing Postfach content. An agent must infer from the name alone that this is the tool for retrieving an attachment rather than reading a message body.

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