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Tools for Agents

by io.github.max124vip-dev
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youtube_transcript

YouTube captions/transcript.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYes
languagesNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • removedInput schema / properties / languages / default
      Removed value: -[
-  "en",
-  "ru"
-]
    • removedInput schema / properties / url / description
      Removed value: -"YouTube watch URL"
  2. First observed

TDQS

D1.3/5.0
Behavior1/5

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

With no annotations, the description carries full responsibility for disclosing behavior. It does not mention what happens when captions are unavailable, language handling, rate limits, return format, or any other behavioral trait. The one-word description adds no transparency.

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

Conciseness2/5

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

The description is under-specified rather than concise. It is a single phrase with no structure or front-loading of important information, and it does not earn its place because it adds no clarity.

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

Completeness1/5

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

For a tool with no output schema, no annotations, and zero parameter documentation, the description is completely inadequate. It does not tell the agent what inputs mean or what to expect from the tool.

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

Parameters1/5

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

Schema description coverage is 0% and the description does not explain the 'url' or 'languages' parameters. It only mentions the general concept of captions/transcript, providing no meaning beyond the parameter names themselves.

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

Purpose2/5

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

The description 'YouTube captions/transcript.' is essentially a noun phrase that restates the tool name without stating an action. It fails to specify what the tool does (e.g., fetch, retrieve, extract) or what resource it acts on beyond the name itself.

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

Usage Guidelines1/5

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

No guidance is provided on when to use this tool versus alternatives like transcribe_audio or read_url. There is no mention of context, prerequisites, or exclusions.

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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