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

Annotations already cover read-only, idempotent, non-destructive, closed-world behavior, so the safety profile is settled. The description adds genuinely useful semantics beyond that: a style is a moodboard rather than a template, and the look should be kept while scenes are invented. It does not mention lookup-failure behavior for an unknown code, which would be the next useful detail.

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-loads the trigger conditions, then the payload, then the usage philosophy — a sensible order with no filler sentences. The 'moodboard, never a template' line is slightly editorial but carries real invocation-relevant meaning, so it 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?

With an output schema present, the description need not enumerate return fields, yet it summarizes them in a way that tells the agent how to apply the result to a clip. Combined with trigger conditions and input forms, an agent has enough to call it correctly; only error/not-found behavior is unaddressed.

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 100% and the single parameter already documents both accepted forms (sref code or slug) with examples. The description's closing sentence repeats that fact rather than adding format rules, so it sits at the baseline where the schema does 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?

Names a specific verb and resource (get_visual_style → a Slice visual style) and enumerates exactly what comes back: palette, materials, motion and type rules, fit, clip usage, STORY FIRST rules. This clearly separates it from siblings like list_styles (enumerate) and restyle_clip (apply).

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 three concrete trigger conditions (an sref-style code, a named style from tryslicemedia.com/styles, or an explicit prompt instruction), which is well above typical. It stops short of naming alternatives such as list_styles or suggest_visual_styles and when to prefer them, so it is not a full 5.

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