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

Annotations only assert readOnlyHint=true; the description adds the genuinely useful explanation that this is a read despite being a POST because the v2 API is action-shaped, pre-empting a likely agent misread. It omits practical traits of a batch fetch such as behavior for unknown ids and any cap on array size.

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 short clauses, front-loaded with the action and scope, with the read-only clarification and endpoint placed after. No filler sentences.

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 description should say what comes back (document objects, ordering, handling of ids that do not exist) and any batch-size limit. For a simple lookup the return shape is inferable, but the missing failure/limit behavior leaves a real gap.

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?

The single documentIds parameter is fully described in the schema, so the schema carries the semantics. The description adds only the notion of 'several' documents, which is already conveyed by the array type, so baseline 3 applies.

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 (fetch) and resource (documents) plus the batch scope (several, in one call), which separates it from the singular get_document. It does not explicitly name list_documents as the filtered alternative, so sibling differentiation is implied rather than stated.

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 'in one call' hints the tool exists for batch efficiency when you already hold ids, but there is no explicit when-to-use vs get_document or list_documents guidance. Usage must be inferred from the name and the id-array parameter.

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