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

No annotations are provided, so the description carries the full burden. It usefully discloses the substance of the response (contents, format, guardrails, buyer value), implying a read-only lookup, but says nothing about whether it is safe/non-mutating, whether an unknown id errors, or any access conditions.

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 the core action and listing the returned facets. Slight redundancy between 'contents' and 'what the buyer gets', but there is no filler.

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 single-parameter read tool with no output schema and no annotations, the description adequately conveys what comes back. It does not cover failure behavior for invalid ids, but nothing critical to invoking it correctly is missing.

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?

There is a single parameter with 100% schema description coverage, including an example id format, so the schema already does the work. The description adds no additional meaning about the id parameter, which makes the baseline 3 correct.

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 ('Full detail of one product') and enumerates the facets returned (contents, format, guardrails, buyer value). It is clear on its own, but it never explicitly contrasts itself with the sibling lihat_katalog, which also deals with products, so the agent must infer the catalogue-vs-detail split.

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?

There is no when-to-use statement, no precondition about needing a product id first, and no mention of alternatives such as lihat_katalog or cara_beli. The only routing hint ('Product id from lihat_katalog') lives in the schema, not the description.

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