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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, so the safety profile is covered. The description adds real operational context (multipart with repeated 'file' field, questions as a JSON string), but its return-value listing (user_ask, ia_response, documents_processed, log_id) largely duplicates the output schema, and it does not note that window_context=true may cause documents to be retained beyond the call.

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 in the first clause, followed by mechanics in a compact paragraph. The endpoint reference (POST /multi-document) and the return-field list are lower-value additions that could be trimmed, but overall it is tight and readable.

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 fairly complex tool (6 params, nested question objects, multipart upload) with a 100% covered schema, annotations, and an output schema, the description supplies the missing glue: multipart shape, per-call limits, and the typed-question structure. It does not explain the retention semantics of window_context or the api_key fallback, which are left to the schema.

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%, so every parameter is already documented in the schema, including the format enum and the window_context/window_time relationship. The description only restates the format enum and gestures at the optional parameters matching OpenAPI MultiDocumentRequest, adding no syntax or constraint detail beyond the schema. 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?

The description gives a concrete verb (ask typed questions) and resource (multiple uploaded documents), and states the operational envelope (up to 5 questions, up to 10 documents). This implicitly separates it from single-document siblings like claix.retrieve.ask and the extract.* family, but it never explicitly names an alternative, so it falls 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 scope limits (max 5 questions, max 10 documents) imply when the tool applies, but there is no explicit when-to-use guidance, no prerequisites, and no routing to sibling tools such as claix.retrieve.ask or claix.agent.* for single-document or single-question cases. Usage is inferable but not stated.

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