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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds real behavioral value beyond that: the deterministic result ordering (brand pack, then team-saved, then built-ins) and the fact that props are included in the payload. It omits pagination/result-size behavior, so not a 5.

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?

It is a single economical sentence with ordering information front-loaded. The inline token 'pack: true' is slightly cryptic because it is not an input parameter, which costs a point on clarity but not on length.

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 no output schema, the description must carry the return-value burden, and it does partially: it says components and their props come back, plus ordering. It does not say whether component IDs are returned (needed for get_component or save_component follow-ups) or whether built-ins can be edited, leaving a gap for a library-listing tool.

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?

Only one parameter exists and schema description coverage is 100%, with the schema already stating 'Project to act on (default: the open one)'. The description implies project scoping via 'the project brand's pack' but adds no format or default details beyond the schema, so the baseline 3 applies.

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?

The description names the specific resource (reusable animated overlay components) and what comes back (the components plus their props), so an agent knows this is a read/list of the component library. It does not distinguish itself from get_component, list_animations, or save_component, so it stops short of a 5.

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?

There is no when-to-use guidance at all: no mention of using get_component for a single item, no mention of list_animations as the adjacent listing tool, and no preconditions. The only implicit cue is the 'project brand's pack first' ordering, which tells the agent nothing about when to choose this tool.

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