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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, so the mutation profile is partly covered. The description adds nothing beyond that: it does not say whether closing is reversible, whether it blocks further replies, or whether confirmation is required. Because destructiveHint=false could be read as "nothing is lost," some clarifying text about the effect of closing would be valuable.

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?

One short sentence, front-loaded with verb and resource, with no filler. Its brevity is efficient rather than padded, though it borders on under-specification for a mutating tool.

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 state-changing ticket operation with no output schema and no annotation coverage of reversibility or side effects, the description leaves the agent without the information needed to call it responsibly. It says what closes, but nothing about consequences or the resulting state.

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?

Single parameter with 100% schema description coverage ("die in get_support_tickets angezeigte interne Ticket-ID"), so the schema already carries the semantics. The description adds nothing about the identifier and the baseline for fully documented single-param schemas is 3.

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?

Names a specific verb ("Schließt") and resource ("Support-Ticket") with a scope qualifier ("eigenes" = own, "bestehendes" = existing) that arguably signals the counterpart to create_support_ticket. An agent can tell it is a state-ending operation rather than a read or a reply. It does not, however, explicitly name the sibling tools (get_support_tickets, reply_to_ticket) it must be distinguished from.

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?

"Bestehendes eigenes" implies a precondition: the ticket must already exist and belong to the caller, which is more than pure restatement. There is still no explicit when-to-use/when-not guidance and no reference to alternatives such as replying instead of closing.

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