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

Annotations indicate readOnlyHint=false (mutation) and destructiveHint=false. The description adds that validation includes moderation, which is additional behavioral context. However, it does not clarify failure modes, idempotency, or side effects beyond validation, leaving some transparency gaps.

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?

Two sentences, front-loaded with 'Étape 2', and no redundant phrasing. The description conveys the action, condition, and output without waste.

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?

Given the single parameter, annotations, and presence of an output schema, the description covers the essential workflow: prerequisite, action, and return value. It does not detail moderation failure outcomes, but that is likely handled by the output schema, so the description is adequately complete for its simplicity.

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% (upload_id described as from create_upload). The description reinforces this and adds the prerequisite of sending bytes first, but does not go beyond the schema's description. Baseline of 3 is appropriate.

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 clearly states the tool validates a photo after bytes are sent, using upload_id, and returns a photo_id. It also differentiates from siblings by specifying its place as step 2 in a pipeline (create_upload → confirm_upload → animate_photo).

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 description provides explicit usage context: it says to call after sending bytes via PUT and with the upload_id from create_upload, and to pass the returned photo_id to animate_photo. It implies when to use it via the 'Étape 2' step, but does not name alternative tools or explicit exclusions.

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