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

Annotations declare a non-destructive write (readOnlyHint=false, destructiveHint=false). The description adds the constraint that the ticket must exist and be your own, which is useful behavioral context. However, it does not disclose error behavior, rate limits, or post-reply effects; the rich error handling lives in the schema, not the description. With annotations covering the safety profile, a 3 is appropriate.

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 with zero waste. It is appropriately sized for a brief purpose statement, though it is terse. No structural issues.

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 simple reply tool, the description states purpose and scope, and the schema provides exhaustive parameter details and error handling. Annotations cover the write/safety profile. However, the description omits any usage guidance or routing to sibling tools, leaving the agent to infer when to use this versus create_support_ticket. Given the available richness, a 3 reflects a complete purpose but incomplete context.

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 100%, and both parameters have detailed descriptions (including byte limits and error conditions). The description adds no parameter information. Baseline 3 is correct when the schema does the heavy lifting.

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?

States a specific verb ('Sendet eine Antwort') and resource ('Support-Ticket') with a scope qualifier ('bestehendes eigenes'). It implicitly distinguishes from create_support_ticket and close_support_ticket, but does not name any sibling or alternative. Clear purpose, but no explicit sibling differentiation.

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 when-to-use guidance, no prerequisites, and no alternatives named. The agent must infer that get_support_tickets is needed to find the ticket ID and that only own existing tickets can be replied to. No exclusions or context are provided.

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