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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description's value is in disclosing the return shape ('why, what you come away with, who should watch'), which is helpful since there is no output schema, but it adds no auth or rate-limit context.

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?

A single well-formed sentence that front-loads the core resource ('Videos judged worth watching') and then summarizes the output fields. No wasted words, though slightly compressed for a fragment-style sentence.

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 simple one-parameter retrieval tool with full annotation coverage and an informative output summary, the definition is nearly complete. The main gap is lack of routing guidance among siblings, which matters given six similar magpie_* tools.

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 description coverage is 100% for the single optional 'date' parameter, so the schema already documents format (YYYY-MM-DD), timezone (US Central), and omit-for-latest behavior. The description adds nothing further, so the baseline 3 is appropriate.

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 identifies the resource: curated video recommendations derived from transcripts, with rationale and audience notes. However, it doesn't name a specific action verb (list/get) and gives no signal distinguishing it from siblings like magpie_today or magpie_rising.

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 statement of when to use this tool versus the six sibling tools, nor any prerequisites or context. The agent must infer that this is the place for curated video picks.

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