Ytdlp Apply Sponsorblock

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

Annotations already indicate non-read-only, non-idempotent, non-destructive behavior. The description adds that it downloads and applies SponsorBlock, but lacks details on output, side effects, or prerequisites. This is adequate given annotations and output schema existence.

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 two sentences, each serving a distinct purpose: stating the action and specifying usage context. No redundant words; it is efficiently structured.

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?

Despite having an output schema and annotations, the description leaves out essential details for a complex tool: how to specify SponsorBlock categories, what the output is (file location, format), and how other parameters affect behavior. It is too brief for a tool with 13 parameters and nested objects.

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%. The description fails to explain any parameter beyond implying 'url' is the media URL. It does not add meaning to the many nested parameters, especially the sponsorblock object which is critical for the tool's function.

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 explicitly states 'Download a media URL and apply SponsorBlock mark or remove options', providing a specific verb and resource. It distinguishes from sibling download tools by focusing on SponsorBlock, and the 'Use when...' line clarifies its unique role.

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 clearly states when to use the tool ('when the user asks to mark, remove, or chapter SponsorBlock categories during download'). It does not explicitly exclude alternative tools, but the context is strong enough to guide selection.

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