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

Annotations already declare readOnly=true and destructive=false, so safety is covered. The description adds genuinely new context: the exact shape of the return (viewer-ordered playlist, dividers, drip delay), the gated/free access field, and an authentication requirement (Cotlet API key with app access), which is valuable and not present in structured fields.

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?

The content is front-loaded with what is returned and is largely free of filler, with no wasted sentences. The opening fragment 'A collection with its playlist in order...' is slightly awkward, keeping it from a top score.

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 carries the burden of explaining return values and does so thoroughly (playlist ordering, dividers, drip delays, access status). It also discloses the auth requirement. It is complete for a single-parameter read tool, missing only explicit workflow/alternative guidance.

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 collection_id parameter is already documented in the schema with its source (list_collections). The description adds no additional parameter meaning, so the baseline 3 for high-coverage schemas 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 clearly states a specific verb (get) and resource (collection), and goes further by describing exactly what it returns: the playlist in viewer order, dividers, and drip days per video. This is far more specific than a tautology, though it never explicitly distinguishes itself from the sibling list_collections or set_collection_playlist.

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 explicit when-to-use or when-not-to-use guidance, and no named alternative. The only routing hint is implicit via the schema note that collection_id comes from list_collections, so an agent must infer the place of this tool in a workflow.

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