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BACH-AI-Tools

Youtube138 MCP Server

playlist_videos

Retrieve videos from a YouTube playlist using its ID. Access video details, manage pagination with cursor tokens, and filter content by language and region parameters.

Instructions

Playlist Videos

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idNoPlaylist ID
cursorNoCursor token
hlNoExample value: en
glNoExample value: US
Behavior1/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Playlist Videos' reveals nothing about whether this is a read or write operation, what permissions might be required, whether it's paginated (though the cursor parameter suggests it might be), or what kind of response to expect. This is completely inadequate for a tool with 4 parameters.

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?

While technically concise with only two words, this represents under-specification rather than effective brevity. The description fails to convey essential information about the tool's purpose or behavior, making it inefficient despite its short length.

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?

Given 4 parameters, no annotations, no output schema, and multiple sibling tools, the description is completely inadequate. It provides no information about what the tool actually does, when to use it, what behavior to expect, or how parameters interact. This fails to meet even minimum requirements for contextual understanding.

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 description coverage is 100%, so the schema already documents all parameters with basic descriptions. The description adds no additional semantic context about parameter usage, relationships, or constraints beyond what's in the schema. The baseline score of 3 reflects adequate schema coverage without description enhancement.

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 'Playlist Videos' is a tautology that essentially restates the tool name without specifying what action it performs. It doesn't indicate whether this tool retrieves, lists, creates, or modifies playlist videos, nor does it distinguish this tool from sibling tools like 'playlist_details' or 'channel_playlists'.

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?

The description provides absolutely no guidance on when to use this tool versus alternatives. With sibling tools like 'playlist_details' and 'channel_playlists' available, there's no indication of what differentiates this tool's functionality or appropriate use cases.

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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