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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered without the description. The description adds useful domain context (what a Look is, how to reuse its id) but says nothing about pagination via limit/offset or what the listing returns.

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 tight sentences that front-load the purpose before the reuse hint. Efficient with no filler, though the {"mode":"existing"} snippet is arguably tangential to a listing tool rather than to selection.

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, zero-required-param listing tool with no output schema, the description covers purpose and scope adequately. It is thin on return shape and pagination behavior across its six optional parameters, which an agent would need to page results correctly.

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 only 50%. The description effectively explains the 'scope' dimension by naming Official/Community/your own Looks, but it leaves q, sort, limit, offset and category entirely to the schema, with category's dependency on get_options undocumented here. It adds some value but does not compensate for the coverage gap.

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 ('Looks'), plus the scope it covers (Official, Community, your own). It even defines what a Look is ('a complete, reusable lyric-video design'), so an agent can distinguish this listing tool from get_look or delete_look without opening any 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?

Browsing is implied as the use case, and the reuse instruction ('Pass its id as {"mode":"existing","id":…}') hints at downstream use. However, it never states when to prefer this over get_look for a single Look or how it interacts with the search-style params like q. Usage is implied, not specified.

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