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

Beyond the annotations (readOnly/idempotent/non-destructive/openWorld=false), the description discloses the interaction model — the customer selects the file and bytes go directly to Brix36 rather than through the tool — and that no paid work/credits are consumed. That flow detail is genuinely additive, though it does not cover what happens after selection (e.g., whether a confirm step follows).

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 sentences, each earning its place: the action, the upload mechanism, and the cost implication. The primary purpose is front-loaded with no filler.

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 an output schema present and rich annotations, return values and safety semantics are covered elsewhere; params are fully documented. The only gap is the post-selection flow (does the picker feed studio_media_confirm?), which an agent might reasonably want to know.

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% and both parameters are fully documented in the schema, so the baseline is 3. The description restates the purpose values and the project binding but adds no format or constraint detail beyond what the schema already provides.

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 action (opens a file picker) plus the exact resource roles it serves (song, artist photo, image/video reference) and the target project. An agent can see it is an interactive picker rather than a URL import, though it never names siblings like studio_media_upload_url or studio_media_import_url to disambiguate the upload paths.

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?

Usage is implied by the enumerated file roles ('song, artist photo or image/video reference') rather than stated as a when-to-use rule. It gives no guidance on choosing this widget over studio_media_upload_url, studio_media_import_url, or studio_reference_upload_link, so the agent must infer the distinction from names alone.

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