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

readOnlyHint already covers the safety profile, but the description adds real behavioral context beyond annotations: that input must be a URL (no numeric-id lookup) and that the response includes the complete raw spec table grouped by section. It doesn't discuss rate limits or failure modes, but for a read-only fetch this is solid added context.

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?

Front-loads the resource and its payload, then closes with the input-sourcing note and constraint. The field enumeration is long but each item is a distinct returned attribute, so it earns its place; only minor trimming would be possible.

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 an output schema and annotations already present, the description needs only to cover purpose and input sourcing, which it does, plus the numeric-id constraint. Nothing essential is missing for correct invocation; only deeper operational context (pagination, caching, failure behavior) is absent and largely unnecessary here.

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%, so the baseline is 3, but the description adds meaning beyond the schema: the path is constrained to a url from a chrono24_search result, and the negative constraint that numeric ids alone won't work. That negative guidance is not present in 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 and resource (one Chrono24 listing's full detail) and enumerates the exact fields returned — brand, model, reference, price/currency/negotiability, condition, movement, case, bracelet, location, seller type, photos, raw spec table. An agent can distinguish it from chrono24_search and chrono24_dealer without opening the schema.

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?

Explicitly says the Path is the listing url from a chrono24_search result, which routes the agent to the correct preceding call, and adds the exclusion that Chrono24 has no lookup by numeric id alone. It never names a direct alternative tool, but the sourcing instruction and negative constraint make the intended workflow unambiguous.

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