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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint=false), so the bar is lower. The description still adds non-derivable context: shared kinds are identical for all accounts while product/element are account-scoped and 'never show another account's uploads,' plus a 'Free' cost note. It stops short of describing pagination or how the default limit of 30 behaves.

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?

Front-loaded with purpose, then usage, then scoping and cost, in three tight sentences with no filler. The account-isolation sentence overlaps somewhat with the kind parameter description in the schema, a minor redundancy, but every sentence otherwise earns its place.

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 read-only, closed-world browse tool with no output schema, the description covers what can be listed, when to call it, and account visibility boundaries. It omits the return shape and limit/pagination behavior, which is a modest gap but not blocking for correct invocation.

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 67%, with q and kind documented but limit carrying only a default and maximum. The description's kind guidance ('shared' vs 'yours alone') largely duplicates the schema's own kind description, so it adds little beyond the structured field. Baseline 3 is appropriate given the schema does most of the work.

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 (browse) and resource (the creative library), then enumerates exactly what is browsable: shared creators, hooks, scenes, and the caller's own products and elements. It also differentiates itself from render_video by positioning itself as the lookup step that precedes rendering.

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 an explicit trigger condition: 'Call this before render_video when the user wants a specific presenter or a saved product instead of one the model invents.' The alternative (letting the model invent a presenter/product) is named alongside the condition that selects this tool, leaving little to inference.

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