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Glama

Server Details

YouTube data MCP server for AI agents. Search YouTube, fetch transcripts, read comments and replies, inspect channels, analyze playlists, and retrieve video details through Stophy’s hosted API.

Status
Unhealthy
Last Tested
Transport
Streamable HTTP
URL

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Tool DescriptionsA

Average 4.5/5 across 8 of 8 tools scored. Lowest: 3.6/5.

Server CoherenceA
Disambiguation5/5

Each tool targets a distinct YouTube data domain: channel browsing, playlist fetching, video details, search, suggestions, kids, music, and credits. Descriptions clearly differentiate them, with no functional overlap.

Naming Consistency4/5

Most tools follow a consistent 'stophy_get_<noun>' pattern (get_channel, get_credits, etc.), but 'stophy_kids' and 'stophy_music' break the pattern by using a noun-only name with type parameters, introducing minor inconsistency.

Tool Count5/5

With 8 tools, the server is well-scoped for a YouTube data extraction service. Each tool covers a distinct aspect of YouTube (channels, playlists, videos, search, kids, music, suggestions, credits), without unnecessary bloat.

Completeness5/5

The tool set provides comprehensive coverage for read-only YouTube operations: channel details, playlist tracks, video metadata with transcript/comments/live chat, search, suggestions, kids-safe content, and music-specific features. No obvious gaps for the intended use case.

Available Tools

8 tools
stophy_get_channelA
Read-only
Inspect

Browse a YouTube channel's content. Returns channel{id, name, handle, subscriberCount, videoCount, isVerified, thumbnails} on every tab. tab options: video, short, live (past live streams), playlist, post (community posts), about. Video and live tabs return items[{id, videoUrl, title, author, publishedAt, thumbnails}]; the short tab returns items with shortUrl instead of videoUrl (no publishedAt); the playlist tab returns items[{id, playlistUrl, title, videoCount, thumbnails}]. All of these paginate with continuationToken. The post tab returns items[{id, url, content, publishedTimeText, likeCountText, commentCountText, images, video}]. About tab returns the full profile including country, joinedDate, viewCount, and links[]. Set query to search within the channel (returns matching videos; tab is ignored). Best for: auditing a creator's catalog, pulling all videos from a channel, finding a channel's video on a topic, reading community posts or the channel description. Not recommended for: fetching a single known video. Use stophy_get_video instead.

ParametersJSON Schema
NameRequiredDescriptionDefault
tabNoWhich channel tab to read: video, short, live (past live streams), playlist, community (posts), course, or aboutvideo
queryNoSearch within this channel. When set, returns the channel's videos matching the query and the tab is ignored
sortByNoSort order for the tab
channelUrlYesChannel URL (e.g. https://youtube.com/@handle)
continuationTokenNoPagination token from a previous channel response
Behavior5/5

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

Annotations declare readOnlyHint=true; description adds detailed per-tab return structures, pagination via continuationToken, and query behavior (tab ignored). 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.

Conciseness4/5

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

Description is long but logically organized: purpose, tab structures, pagination, search behavior, best/not-recommended. Some redundancy but all sentences add value.

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?

Given high complexity (multiple tabs, different return formats, pagination, query) and no output schema, the description fully covers expected behavior and structures, ensuring adequate context for correct invocation.

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% with parameter descriptions, but the main description adds significant context: exact return fields per tab, pagination details, and query behavior. This goes beyond schema, justifying a score above baseline 3.

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?

The description clearly states 'Browse a YouTube channel's content' and lists specific return fields. It distinguishes from sibling tools by explicitly recommending stophy_get_video for single videos.

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?

Explicit best-for scenarios (auditing a creator's catalog, reading posts) and not-recommended cases (single video) with clear alternative. Also explains when query overrides tab.

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

stophy_get_creditsA
Read-only
Inspect

Check your remaining Stophy API credit balance. Returns {credits: number}. Does not consume a credit. Use before running large batch jobs to confirm you have enough credits.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

Behavior4/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false. The description adds 'Does not consume a credit,' which is valuable behavioral context beyond annotations.

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 short, front-loaded sentences with zero wasted words. Every sentence 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?

For a simple read-only balance check with no parameters and no output schema, the description fully covers purpose, behavior, return type, and usage context.

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?

No parameters exist, and schema coverage is 100%. Baseline of 4 is appropriate since description correctly omits parameter details.

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?

The description uses a specific verb ('Check') and resource ('your remaining Stophy API credit balance'), clearly distinguishing it from sibling tools like stophy_get_channel.

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

Usage Guidelines4/5

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

Explicitly advises use before large batch jobs to verify credit sufficiency, providing clear context. Does not specify when not to use but implies the tool's narrow scope.

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

stophy_get_playlistA
Read-only
Inspect

Get all videos in a YouTube playlist. Returns playlist{id, playlistUrl, title, author, description, videoCount} and items[{id, videoUrl, title, author, publishedAt, thumbnails}] with continuationToken. Best for: processing curated collections, course playlists, or a channel's uploads playlist.

ParametersJSON Schema
NameRequiredDescriptionDefault
playlistUrlYesPlaylist URL (e.g. https://youtube.com/playlist?list=PLAYLIST_ID)
continuationTokenNoPagination token from a previous playlist response
Behavior3/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false, so description's safety contribution is minimal. It adds pagination behavior (continuationToken) and return structure, but doesn't disclose any behavioral traits beyond what's typical for a read-only list endpoint.

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 efficient sentences: first states purpose and return shape, second lists best-use scenarios. No redundant words or information.

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

Completeness4/5

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

Description fully covers return structure with field names, mentions pagination, and relates to use cases. Without an output schema, this provides sufficient context for a simple read tool, though it could note any limits on playlist size.

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% (both playlistUrl and continuationToken have descriptions). The description adds no extra semantic meaning beyond the schema, so baseline score of 3 is appropriate.

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

Purpose4/5

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

Description clearly states 'Get all videos in a YouTube playlist' and enumerates the returned fields. While it mentions best use cases, it does not explicitly distinguish this tool from siblings like 'stophy_search_videos' which also retrieves videos.

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

Usage Guidelines3/5

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

Description provides 'Best for:' guidance (processing curated collections, course playlists, channel uploads) but lacks explicit when-not-to-use or direct comparison with sibling tools. Usage context is implied rather than stated.

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

stophy_get_suggestionsA
Read-only
Inspect

Get YouTube search autocomplete suggestions for a query. Returns {suggestions: string[]}. Optionally set hl (language, e.g. en) and gl (country, e.g. US). Best for: expanding a seed query into related search phrases, gathering keyword ideas, or seeing what people search for around a term before calling stophy_search_videos.

ParametersJSON Schema
NameRequiredDescriptionDefault
qYesSearch query
glNoCountry code, e.g. US, GB, DE. Defaults to US
hlNoLanguage code, e.g. en, fr, de. Defaults to en
Behavior5/5

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

Annotations declare readOnlyHint=true and destructiveHint=false. The description adds return format ({suggestions: string[]}) and optional parameters, fully disclosing behavior without contradictions.

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 short sentences plus a 'Best for' clause, all front-loaded with purpose. No fluff or redundant information.

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?

Tool has 3 simple parameters and is read-only. Description explains return type, optional parameters, and usage scenario, fully covering what an agent needs to invoke it correctly.

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?

Input schema covers all parameters with descriptions (100% coverage). Description merely reiterates that hl and gl are optional and gives examples, adding minimal value beyond the schema.

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?

The description states it gets YouTube search autocomplete suggestions for a query, specifies the return type, and distinguishes itself from sibling tool stophy_search_videos by noting it's best for expanding seed queries before searching.

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 says 'Best for: expanding a seed query into related search phrases, gathering keyword ideas, or seeing what people search for around a term before calling stophy_search_videos,' providing clear context and an alternative tool.

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

stophy_get_videoA
Read-only
Inspect

Fetch details, transcript, comments, comment replies, or live chat for a YouTube video. type="details": returns video{id, title, author, description, viewCount, likeCount, durationSec, publishedAt, tags, isLive} and related[]. type="transcript": returns {videoId, language{code, name, isAutoGenerated}, isTranslated, availableTracks, segments[{text, start, duration}], text}; if the requested lang has no native track, a machine translation is returned along with a top-level warning. type="comments": returns {videoId, sortBy, items[{id, text, author, likeCount, replyCount, repliesToken}], continuationToken}. type="replies": pass the repliesToken of a comment as continuationToken to fetch its replies. type="livechat": returns {videoId, status (live|upcoming|replay|chat_disabled|not_live), isLive, concurrentViewers, messages[{id, text, author, authorId, timestampUsec, isOwner, isModerator, isVerified, superChatAmount, superChatCurrency}], continuationToken, pollIntervalMs}. Set chatType="top" for moderated Top chat (default) or "live" for all messages. To follow a live stream, poll again passing the previous continuationToken for only new messages, waiting pollIntervalMs between polls; a null continuationToken means the stream ended. Best for: extracting content from a known video URL. Not recommended for: discovering videos. Use stophy_search_videos instead.

ParametersJSON Schema
NameRequiredDescriptionDefault
langNoFor transcript only: BCP-47 language code (e.g. en, es, fr, pt-BR). Returns that caption track if it exists, otherwise a machine translation of the default track into that language. Omit for the video's original/auto captions.
typeYesWhat to fetch: details = title/description/stats, transcript = timestamped captions, comments = threaded comments, replies = replies to a comment, livechat = live stream chat messages + status
sortByNoSort order for comments: any (YouTube's default ordering), top, or latest. Defaults to any
chatTypeNoFor livechat only: 'top' = Top chat (moderated, default), 'live' = Live chat (all messages). Applied on the first call; later polls keep the chosen mode.
videoUrlNoYouTube video URL (e.g. https://youtube.com/watch?v=VIDEO_ID). Required for details, transcript, comments, and livechat.
continuationTokenNoPagination token. For comments, pass a previous comments response token. For replies, pass the repliesToken of a comment. For livechat, pass the continuationToken from a previous livechat response to poll for new messages.
Behavior5/5

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

Discloses key behaviors like machine translation fallback for transcripts, live chat status, and polling termination. Annotations indicate read-only, which is consistent with description.

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

Conciseness4/5

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

Well-structured with clear sections for each type and usage guidance. Slightly lengthy but every sentence adds value; front-loaded with purpose.

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?

Despite no output schema, description provides thorough detail on return structures for all five types, covers edge cases, and explains polling/pagination. Complete for a complex tool.

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%, baseline 3. Description adds value by explaining parameter interactions (e.g., continuationToken usage for replies and livechat), defaults (chatType, sortBy), and requirements (videoUrl for most types).

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?

The description clearly states the tool fetches details, transcript, comments, replies, or live chat for a YouTube video, and explicitly distinguishes from sibling tools by recommending stophy_search_videos for video discovery.

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?

Provides explicit guidance on when to use (extracting content from known URL) and when not (discovering videos), including alternative tools. Also details polling behavior for live chat and how to fetch replies.

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

stophy_kidsA
Read-only
Inspect

type="search": search YouTube Kids with q and optional continuationToken, returns Kids-safe video items and continuationToken. type="video": fetch YouTube Kids video metadata and related Kids videos from videoUrl. Best for: child-safe discovery and metadata from the YouTube Kids surface.

ParametersJSON Schema
NameRequiredDescriptionDefault
qNoYouTube Kids search query
typeYesKids resource to fetch
videoUrlNoYouTube Kids / YouTube video URL or bare video ID
continuationTokenNoPagination token from a previous response
Behavior5/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false. The description adds significant behavioral context by detailing the two modes and their return values (Kids-safe video items, continuationToken for search; video metadata, related Kids videos for video), which goes beyond annotations.

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?

The description is three sentences, front-loaded with mode definitions. Every sentence provides essential information without redundancy or fluff.

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?

Despite lacking an output schema, the description explicitly mentions return values for both modes. With 4 parameters fully described in the schema and two modes clearly outlined, the description is sufficiently complete for correct tool selection and invocation.

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%, baseline 3. The description adds meaning by explaining which parameters apply to each type (e.g., q and continuationToken for search; videoUrl for video), enhancing understanding of parameter relationships beyond the schema's individual descriptions.

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?

The description clearly defines two distinct modes (search and video) with specific verbs and resources, and explicitly states 'Best for: child-safe discovery and metadata from the YouTube Kids surface,' distinguishing it from sibling tools like stophy_search_videos and stophy_get_video.

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

Usage Guidelines4/5

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

The description states it is best for child-safe discovery and metadata from the YouTube Kids surface, implying when to use it. It does not explicitly list when not to use or provide alternatives, but the context of sibling tools makes the differentiation clear.

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

stophy_musicA
Read-only
Inspect

type="search": search YouTube Music with q and optional searchType (song|video|album|artist|playlist|podcast|episode|profile), returns items[] and continuationToken. type="suggest": autocomplete music queries with q. type="song": fetch rich song metadata from videoUrl. type="lyrics": fetch lyrics from videoUrl. type="album": fetch album metadata and tracks from albumUrl. type="artist": fetch artist profile sections from artistUrl. type="playlist": fetch playlist tracks from playlistUrl and optional continuationToken.

ParametersJSON Schema
NameRequiredDescriptionDefault
qNoSearch or suggestion query
typeYesMusic resource to fetch
albumUrlNoYouTube Music album URL or bare MPRE/OLAK album ID
videoUrlNoYouTube / YouTube Music video URL or bare video ID
artistUrlNoYouTube Music artist URL or bare UC/MPAD artist ID
searchTypeNoMusic search result type. Defaults to songsong
playlistUrlNoYouTube / YouTube Music playlist URL or bare playlist ID
continuationTokenNoPagination token from a previous response
Behavior4/5

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

The description discloses that operations are read-only (consistent with readOnlyHint=true and destructiveHint=false). It details what each type returns (e.g., search returns items[] and continuationToken, song returns rich metadata). No contradictions with annotations. Could mention that it does not modify data.

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

Conciseness4/5

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

The description is concise, packing all 7 modes into a single sentence without redundancy. It front-loads the type system and clearly separates each mode with semicolons. It omits fluff, but could break into a list for better readability.

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

Completeness4/5

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

Given the tool's complexity (8 params, 7 modes, no output schema), the description covers what each mode returns and required parameters. It does not address error handling or rate limits, but provides sufficient context for an agent to invoke specific modes correctly.

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?

The input schema has 100% coverage with descriptions for all parameters. The description adds value by explaining how parameters relate to each type (e.g., videoUrl is needed for song/lyrics, playlistUrl for playlist). It clarifies the continuationToken is used for pagination, which the schema only names.

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?

The description clearly specifies that the tool interacts with YouTube Music resources, with distinct modes for search, autocomplete, song metadata, lyrics, album, artist, and playlist retrieval. It differentiates from sibling tools like stophy_search_videos by focusing on music-specific operations and returns types.

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

Usage Guidelines4/5

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

The description explicitly lists each 'type' operation and its required parameters (e.g., videoUrl for lyrics, albumUrl for album). It provides guidance on when to use each mode via the type enum. However, it does not directly compare to sibling tools or state when not to use this tool vs others.

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

stophy_search_videosA
Read-only
Inspect

Search YouTube by keyword with optional filters. Returns items[] discriminated by type: video items have {id, videoUrl, title, author, description, duration, durationSec, viewCount, publishedAt, isLive, thumbnails}; short items have {id, shortUrl, title, viewCount, thumbnails}; channel items have {id, channelUrl, name, handle, subscriberCount, thumbnails}; playlist items have {id, playlistUrl, title, author, videoCount, thumbnails}. Also returns continuationToken for the next page. Best for: discovering videos on a topic, finding recent uploads. Not recommended for: fetching a specific video you already have the URL for. Use stophy_get_video instead.

ParametersJSON Schema
NameRequiredDescriptionDefault
qYesSearch query
typeNoFilter by content type
sortByNoSort order. Defaults to relevance
durationNoshort = under 4 min, medium = 4 to 20 min, long = over 20 min
featuresNoFilter by video features
uploadDateNoFilter by upload date
continuationTokenNoPagination token from a previous search response
Behavior4/5

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

Annotations already provide readOnlyHint and destructiveHint; the description adds behavioral details such as the discriminated item types and pagination via continuationToken, going beyond annotations.

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

Conciseness4/5

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

The description is somewhat lengthy but well-structured, front-loading purpose, then return schema, then usage recommendations. Each sentence adds value, though it could be slightly more concise.

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?

Despite lacking an output schema, the description thoroughly explains the return structure for each item type and the continuationToken. With 7 parameters at 100% schema coverage and clear usage guidance, the description is fully complete for the tool's complexity.

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 each parameter already has a description. The tool description does not add extra parameter semantics beyond what the schema provides; it focuses on return structure instead.

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?

The description uses a specific verb ('search') and resource ('YouTube videos'), and clearly distinguishes from sibling tools like 'stophy_get_video' by stating it is not for fetching a specific video with a known URL.

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 provides when to use ('discovering videos on a topic, finding recent uploads'), when not to use ('fetching a specific video you already have the URL for'), and an alternative tool ('stophy_get_video').

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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