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

Annotations cover the safety profile (non-read-only, non-destructive, non-idempotent), and the description adds real substance beyond them: size/checksum verification, quarantine, deferred validation, and the quarantined/validated/rejected status set. The only slight ambiguity is that 'call again with the same uploadId' reads like a safe polling re-invocation while the annotations declare idempotentHint=false; not a contradiction, but the retry/polling semantics could be stated more sharply.

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 dense sentences, front-loaded with the action and followed by returns and constraints; little waste. It is slightly packed, bundling lifecycle, return values, and exclusions into one breath, but every clause carries information the agent needs.

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 two-parameter mutation tool with rich annotations and an output schema, the description supplies the pipeline context, the status outcomes, and the reuse/polling rule. Nothing needed to invoke 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?

Schema description coverage is 100%, so both parameters are already documented and the baseline is 3. The description usefully ties uploadId back to upload_create and frames checksum as the verification input, but adds no format or syntax beyond the schema's SHA-256 pattern.

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 ('finalize bytes sent to the signed PUT URL'), names its predecessor (upload_create), and explicitly contrasts itself with siblings it is not (asset_import, material tools, scene import, Blender jobs). An agent can place it precisely in the upload pipeline without opening another schema.

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?

Gives explicit sequencing: call after upload_create, call again with the same uploadId to poll deferred validation, and only use the asset downstream once validated. It also names exclusions ('does not import into a scene or return a Blender job'), which is exactly the when-not guidance that prevents misuse.

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