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

No annotations are provided, so the description carries the full behavioral disclosure burden. It does not mention authentication requirements, rate limits, error behavior, or what happens when a transcript is unavailable. Only minimal scoping ('single YouTube video') is given, which is already implied by the required parameter.

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 a single, front-loaded sentence with zero waste. For a simple retrieval tool, this is appropriately sized and well 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?

With no output schema and no annotations, the description should explain the return format (e.g., plain text, JSON, segmented cues) and how include_timestamps affects the output. It fails to do so, leaving the agent unclear about what to expect after invocation.

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 fully documents both video_url and include_timestamps. The description adds no syntax, format, or behavioral meaning beyond what the schema already provides, which is the baseline expectation when schema coverage is high.

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 states a specific verb and resource: 'Return the transcript' for a 'single YouTube video URL or ID'. This clearly distinguishes it from channel-level tools like get_channel_info and list_channel_videos. However, it does not explicitly differentiate from the similarly scoped sibling get_download_url, which also operates on a single video, 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?

The description offers no when-to-use guidance, no prerequisites, and no alternatives. It simply states what it returns, leaving the agent to infer when this tool is appropriate versus other video-related siblings.

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