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

Annotations already establish readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds value beyond that by disclosing it is a one-time prerequisite call and by characterizing the payload ('when to choose' hints and recommendations by content type). It stops short of describing the response structure, but with annotations carrying the safety profile this is solid.

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 with no filler, front-loading the resource and value coverage before the imperative usage instruction. Every clause 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 zero-parameter, no-output-schema lookup tool, the description does the necessary work by naming the option sets and the type of guidance returned. A brief note on the returned structure (a flat list vs. value-to-hint mapping) would close the remaining gap, but nothing essential 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?

The tool takes zero parameters, so the baseline of 4 applies. The enumerated categories in the description describe output content rather than inputs, which is a reasonable use of the space but does not add parameter meaning.

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 (List) and resource (styling options), then enumerates the exact value sets it covers (layout, subtitle_style, title_style, font, subtitle_position). It also names the sibling it feeds into, create_clips, so an agent can immediately distinguish it from list_clips or get_job.

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?

Explicit timing and sequencing guidance: 'Call once before create_clips to pick styling.' This tells the agent both when to invoke it in a workflow and why, with the downstream consumer named. No ambiguity about alternatives is left open.

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