VidLens

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

With no annotations provided, the description carries the full burden. It adds valuable timing context ('[~1-3s]') but fails to disclose critical behavioral traits suggested by the 'dryRun' parameter (implying side effects), nor does it explain return values, idempotency, or data persistence.

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 description is appropriately brief and front-loaded with the core action. The timing notation, while slightly informal, efficiently communicates performance expectations without verbosity. No redundant or filler content is present.

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?

Given four parameters with zero schema descriptions, no output schema, and no annotations, the description is insufficiently complete. It omits return structure, parameter semantics, and side-effect disclosures that are essential for a tool with a 'dryRun' option suggesting mutating behavior.

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 0%, requiring the description to compensate for undocumented parameters. However, the description fails to explain any of the four parameters (playlistUrlOrId, maxVideos, includeVideoMeta, dryRun), leaving critical constraints like the 200-video limit and the purpose of dryRun completely undocumented.

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 defines the transformation ('Expand a playlist into individual videos') and identifies the target use case ('downstream analysis and batch workflows'). It effectively distinguishes from siblings like analyzePlaylist and importPlaylist by emphasizing the expansion/decomposition aspect, though it doesn't explicitly contrast with them.

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 provides implied usage context ('for downstream analysis') but lacks explicit guidance on when to use this tool versus alternatives like importPlaylist or analyzeVideoSet. No 'when-not' scenarios or prerequisites are mentioned.

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