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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds value beyond that by disclosing the return content in detail - the complete plan with all work per service plus Zusatzwartung, original Porsche wording, page number and source - which matters given there is no output schema.

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?

The purpose is front-loaded, but the same content is stated twice, once in German and once in English, which effectively doubles the length without adding meaning. It is not fatally bloated, but the bilingual duplication is not fully earning its place.

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 fetch tool with annotations that cover the safety profile and no output schema, the description supplies the necessary return-content details (full plan vs. calculation, source and page references). It is complete enough to call correctly, with only minor room for authentication or retrieval-behavior notes.

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 the single parameter 'id' is documented in the schema as 'id aus search', so the baseline is 3. The description reinforces that the id identifies a search hit but adds no format, type, or sourcing detail beyond the schema.

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+resource: it retrieves ('Ruft ... ab') one hit from search, returning either a full Porsche maintenance plan or a calculation. It ties itself to the sibling 'search' as the source and names what the fetched object contains, so an agent can distinguish it from search or the other porsche_* tools. It does not explicitly contrast with porsche_wartungsplaene, keeping it short of 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?

The phrase 'einen Treffer aus search ab' implies the intended workflow (call search first, then fetch a specific hit by id), which is decent implied usage. However there is no explicit when-to-use statement, no when-not, and no direct comparison to the sibling alternative 'search' or 'porsche_wartungsplaene'.

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