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

Adds substantial behavior beyond the annotations: it is fully reversible (previous playlist returned), it is rejected when drip_days is set on a free-access collection, it explains the drip unlock timing (~2 hours per video), and it requires a Cotlet API key with app access. This is rich operational context the annotations do not convey.

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 core replacement action and keeps every sentence purposeful, though it is somewhat dense with several distinct facts packed into one paragraph.

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 mutation tool with no output schema, it covers reversibility, auth requirements, rejection conditions, and timing semantics, leaving nothing critical an agent needs to call it 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 100%, so the baseline is 3, but the description goes further by explaining what drip_days means (days after a viewer first opens the collection) and the unlock cadence, adding semantic meaning not present in the schema string.

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 and resource ('Replace the playlist of a collection') and names the concrete payload contents (video order, dividers, drip days). An agent can tell this apart from the sibling read tools like uscreen_get_collection and uscreen_list_collections.

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?

Provides clear context for acting: it runs without confirmation because members only see the change once the collection is published, and it justifies the call by noting the previous playlist is returned for restoration. It does not explicitly name alternative tools, so it falls short of a 5.

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