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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavioral facts: results are scoped to a workspace and an empty list explicitly means nothing is saved (not an error), which prevents misreading of the response.

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 compact sentences, front-loaded with the resource and scope, followed by the actionable follow-up and the empty-state meaning. No filler and nothing left dangling.

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 parameters, full annotation coverage and an output schema handling return values, the description covers everything an agent needs to select and call it correctly, including scope and empty-result semantics.

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 there is nothing to disambiguate and the baseline is 4. The only param-like reference ("videoSettings.sequenceId") belongs to other tools rather than this one, so it adds context without misdescribing this schema.

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?

Uses a specific verb+resource ("List the workspace's saved motion sequences") and even defines what a motion sequence is ("one slide's animations, saved in the editor's Your sequences"). It does not explicitly contrast itself with the sibling postnitro_list_motion_styles, which is the most likely confusion point, 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?

The description tells the agent what to do with a returned id ("Pass an id as videoSettings.sequenceId to put it on every slide") and how to read the empty case, which is useful downstream guidance. However, it never states when to call this versus postnitro_list_motion_styles, so the when-to-use decision is only implied.

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