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

The description discloses that it returns 'one explicit page' of segments, indicating pagination behavior, and that segments are 'timestamped,' giving a hint about the output format. However, it does not disclose other behaviors such as authentication requirements, rate limits, or what happens when no captions are available. With no annotations, this is partial disclosure.

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, concise sentence that front-loads the action ('Gets') and specifies the resource. No unnecessary words or repetition, making it easy to parse quickly.

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?

The tool has no annotations or output schema, yet the description only covers the core function and a pagination hint. It lacks details about return structure, error conditions, or how to use the language parameter. Given the complexity of 4 parameters, the description is not fully complete, but it does cover the primary purpose.

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 coverage is 0%, and the description does not explain any of the four parameters (url, cursor, language, maxSegments). It implies the tool operates on a YouTube video, but does not describe how cursor, language, or maxSegments affect the call. The description adds context about the output but not about the parameters.

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 states the tool retrieves a page of timestamped YouTube caption segments, using the specific verb 'Gets' and resource 'caption segments.' It also specifies 'creator or automatic,' adding clarity. However, it does not explicitly distinguish itself from sibling tools like youtube_list_transcript_languages, though the function is clear.

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 no guidance on when to use this tool versus alternatives. It does not mention that youtube_list_transcript_languages lists available languages, or that this tool retrieves actual segments. No prerequisites, exclusions, or when-to-use recommendations are stated.

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