get_video_timestamps

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

With no annotations provided, the description carries the full burden. It clearly states that it uses AI to identify timestamps and does not extract frames. However, it does not disclose other behavioral traits such as API rate limits, how the AI works, or constraints on video length/format.

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 concise, consisting of two sentences. The first sentence clearly defines the tool's function, and the second sentence explains its purpose relative to other tools. No unnecessary information 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 the tool's moderate complexity (3 parameters, no output schema, no annotations), the description is fairly complete. It explains the tool's purpose and its relationship to extraction tools. However, it does not mention return format or behavior for invalid URLs, but the schema provides validation hints.

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?

The schema already provides descriptions for all parameters (100% coverage), so the description adds minimal value beyond the schema. However, the description does give context for the 'focus' parameter by providing examples like 'product demos' and 'code examples', which adds nuance beyond the schema's generic description.

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's purpose: to use AI to identify important moments in a YouTube video and return their timestamps without extracting frames. It distinguishes itself from sibling tools by emphasizing that it is a preview mode that does not extract frames, which sets it apart from extract_frames and extract_screenshots.

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 clear context for when to use this tool: 'to preview what timestamps would be selected before committing to extraction.' However, it does not explicitly mention when not to use it or suggest alternatives, but the sibling list makes it clear that extraction tools exist for different purposes.

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