Crawlora MCP

youtube_transcript_languages

Read-only

List transcript languages YouTube exposes for a video ID. Use youtube_transcript or youtube_captions with a returned language when you need transcript text.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "id": "<id>"
    },
    "name": "youtube_transcript_languages"
  }
}

Input Schema

Name	Required	Description	Default
`id`	Yes	YouTube video id, or channel id/handle/URL depending on the endpoint.

Output Schema

Name	Required	Description	Default
`data`	Yes	The tool result payload (shape varies per tool; see each tool's docs resource).

Schema Changelog

Changes observed during successful MCP inspections.

First observedOct 5, 2026

TDQS

A4.5/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that this is a preparatory/enumeration step feeding other tools, which is useful, but it discloses no auth needs, rate limits, or other behavioral traits. Adequate but not rich given the annotations do the heavy lifting.

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?

Two sentences with zero waste: purpose is front-loaded, then the downstream-workflow guidance. Every clause earns its place.

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?

An output schema exists, so return values need not be explained. For a simple one-parameter read-only lookup, the description covers purpose and the workflow hand-off to the transcript/captions tools, which is everything an agent needs.

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

Parameters4/5

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

Schema coverage is 100%, so the baseline is 3. The description adds value by narrowing the param to a 'video ID', resolving the schema's ambiguous 'video id, or channel id/handle/URL depending on the endpoint' wording for this specific endpoint.

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?

States a specific verb (List) and resource (transcript languages) plus the scoping input (a video ID). It also names the sibling tools it is NOT, so an agent can distinguish it from youtube_transcript/youtube_captions without opening either schema.

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 routes the agent: this tool lists languages, and youtube_transcript or youtube_captions should be called with a returned language when transcript text is needed. Names the alternatives and the exact condition that selects them, leaving nothing to inference.

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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