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

Annotations already declare this as readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds 'nebeneinander' (side-by-side), hinting at the comparative output shape, but says nothing about return format or ordering — modest added value over the annotations.

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 compact sentence with no filler, front-loading the verb, the count constraint and the id source. Nothing is wasted, though it is arguably terse given the missing output context.

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?

With no output schema, the agent gets no description of what the comparison actually returns beyond 'nebeneinander'. For a single-parameter tool with annotations present this is adequate, but the comparison output and any ordering/format behavior remain unexplained.

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 0% and there is one parameter, so the description must carry the load. It explains that ids are 2–5 entries sourced from search results, which adds provenance meaning, but the 2–5 range simply restates the schema's minItems/maxItems.

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 (Vergleicht) and resource (Einträge) plus the cardinality bound (2 bis 5), so the agent immediately knows this is a multi-entry comparison. However, it does not differentiate itself from siblings like 'fetch' or 'search', which an agent could otherwise confuse with entry retrieval.

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?

'ids aus den Suchergebnissen' implies the ids come from a prior search, giving implicit workflow guidance. But there is no explicit when-to-use vs when-not guidance relative to 'fetch' or the search siblings.

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