discover_new_videos

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

No annotations present, but description fully discloses state tracking, filters (skip livestreams, short videos, old videos), and first-run behavior. No contradictions.

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?

Well-organized with sections for modes, state, filters, args, and returns. Each sentence adds value; no redundancy. Front-loaded with core purpose.

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?

Complex tool with 4 params, state management, filtering, and two modes. Description covers all aspects: inputs, behavior, output fields. Sufficient without output schema.

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%, but description explains all 4 parameters: channel_ids, tag, max_per_channel, min_duration_seconds, including defaults and conditional behaviors.

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?

Clearly states the tool discovers new videos from YouTube channels since last seen, with two modes and filtering. Distinguishes from siblings like search_youtube_channels or get_video_info which serve different purposes.

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?

Explicitly explains two modes: explicit channel_ids vs registry-based, and tag filter. Also describes first-call behavior and mentions related tools for registry management.

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