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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is covered. The description adds the opt-in/bounded/pageable transcript behavior and that it discloses transcript provenance, but these largely restate what the schema parameter descriptions already say, limiting the marginal value.

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?

Two sentences, front-loaded with the return contents, and no filler. The phrasing 'says how the transcript was produced when recorded' is slightly telegraphic, keeping it from a 5.

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 does carry the return-value burden and lists detail, thumbnail, citation link, and transcript provenance. Combined with annotations covering safety and a fully documented schema, it is nearly complete for a read tool, missing only explicit routing to siblings.

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%, so the schema already documents all four parameters with defaults and bounds. The description's 'opt-in, bounded and pageable' mirrors include_transcript, transcript_max_chars, and transcript_offset without adding format or syntax detail, so the baseline 3 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 names the resource and enumerates what it returns (video detail, thumbnail, citation link), so an agent can tell it apart from list/search siblings. It is a noun phrase rather than an explicit verb, and it never names search_videos as the counterpart, so it falls short of a 5.

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 when-to-use/when-not guidance and no alternative is named. The only usage-flavored statement ('Transcript is opt-in') describes a parameter default rather than a condition for selecting this tool over search_videos or get_podcast.

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