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list_caption_languages

Read-only

Check available caption languages for any YouTube video. Distinguishes auto-generated from manually created captions to indicate quality.

Instructions

List all available caption/subtitle languages for a video. USE THIS FIRST before get_transcript to check language availability. Shows auto-generated vs manual captions (manual = better quality). Essential for non-English videos.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
videoIdYesYouTube video ID or URL
Behavior4/5

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

Annotations already declare readOnlyHint, but description adds value by stating it shows auto-generated vs manual captions and notes manual quality, aiding agent in selecting the right tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three efficient sentences, front-loaded with purpose, then usage guidance, then additional context; no redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Description fully covers tool's functionality, usage context, and output quality indication; no gaps given simplicity and annotations.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% and description does not add parameter-level details; baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states the action 'List all available caption/subtitle languages for a video', specifies the resource (video), and distinguishes from get_transcript by advising to use it first.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly advises 'USE THIS FIRST before get_transcript' and provides context about auto-generated vs manual captions and necessity for non-English videos.

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

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