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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the agent knows this is an irreversible-per-item write. The description contributes the authorization boundary (only notifications sent by or received by the caller's own account) and the single-item granularity, which are genuine additions beyond the annotations. It does not state whether deletion is permanent or how failures on foreign ids are reported, so it stays at a solid 3.

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?

Two short sentences, front-loaded with the operation and its scope, then the use case. The trailing English keyword tag "| EN: notification, delete, inbox cleanup" is redundant with the German text and reads as search padding, which costs a point but does not obscure the content.

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 one-parameter delete tool with rich annotations and no output schema, the description covers the operation, the authorization scope, the granularity and the motivating use case. The only minor gap is what a successful call returns or how partial failures are surfaced, which is not critical for a destructive single-item delete.

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 coverage is 100% and the single parameter is already documented as the notification id taken from ontouser_notification_index. The description adds only the "einzeln je id" framing (no bulk deletion), which is a small but real clarification over the schema. Baseline 3 applies when the schema carries the parameter 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?

"Eine eigene Notification loeschen" gives a specific verb+resource, and the parenthetical "nur gesendete oder empfangene des eigenen Kontos" plus "einzeln je id" pins the scope precisely. That scope wording implicitly separates it from ontouser_notification_index/read/send, though no sibling is named explicitly, which keeps it from a 5.

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?

"Fuer das Aufraeumen des Postfachs" indicates the intended situation (inbox cleanup), which is real usage context rather than none. However, there is no explicit guidance on when NOT to delete (e.g. use ontouser_notification_read to mark as read instead) and no mention of prerequisites or confirmation, so the routing is only implied.

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