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

Annotations already declare readOnlyHint, openWorldHint=false and destructiveHint=false, so safety is covered. The description adds genuinely new behavior beyond that: a max of 4 ids per call and partial-failure semantics where unknown ids are returned in unknownIds rather than failing the whole call. It stops short of describing ordering or full return shape, but the error-tolerance disclosure is real value.

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?

Three sentences, front-loaded with the core action and limit, followed by id sourcing and then the failure-mode note. No filler and every sentence carries distinct information.

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?

There is no output schema, so the description must hint at returns; it does so by naming the unknownIds field for failed ids. Combined with id sourcing, the 4-item cap, and the when-to-use rule, an agent has everything needed to call this correctly.

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 0% for the single required 'ids' parameter, so the description must carry the load and largely does: it tells the agent the values are section ids, where to obtain them (search_docs or a topic index), and the 4-item ceiling. It does not give id format examples, but the semantic guidance is substantially better than the bare 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 ('Read PartForge documentation sections in full, by id') plus a hard bound ('up to 4'). It also implicitly separates itself from the sibling search_docs by explaining that search_docs is where the ids come from.

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?

Explicit when-to-use: before invoking any operation whose options or semantics are uncertain, and explicitly says never to guess a method name. It also names the sibling alternative (search_docs) and the topic-index fallback as the id sources.

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