TubePull
Server Details
Download YouTube videos as MP3/M4A/MP4 from any MCP-compatible AI assistant. Free 3/day, $3.99/mo.
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP
- URL
- Repository
- miketwalker/tubepull-mcp
- GitHub Stars
- 0
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Tool Definition Quality
Average 4.5/5 across 2 of 2 tools scored.
The two tools have entirely distinct purposes: one downloads videos/audio, the other retrieves metadata. There is no overlap or ambiguity.
Both tools follow a consistent verb_noun pattern: download_video and get_video_info, making the naming predictable and clear.
With only two tools, the server is minimal but appropriately scoped for its focused purpose of pulling YouTube videos and metadata. It could benefit from a search tool, but the count is reasonable for a narrow utility.
The server covers the core workflow of retrieving video metadata and downloading content. Minor gaps exist, such as no ability to list or search videos, but the main use case is well-supported.
Available Tools
2 toolsdownload_videoDownload YouTube video (MP3 or MP4)AInspect
Download a YouTube video as a video file (MP4, default) or as an audio file (MP3 / M4A). This is THE tool to use whenever a user asks to save, download, rip, extract, archive, get offline, or convert a YouTube link. IMPORTANT: the format argument defaults to mp4 (video). Only pass an audio format (mp3 / m4a / audio) when the user explicitly says audio, MP3, music, song, or "rip / extract the audio".
Use this tool when the user says things like:
"download this YouTube video"
"save that as MP3" / "rip the audio" / "extract the audio"
"get the song from this YouTube link" / "save this song"
"convert YouTube to MP4" / "download in 1080p"
"save this lecture/podcast/talk for offline"
"archive this clip" / "grab a copy of this video"
any sentence containing a youtube.com or youtu.be URL plus a verb like download, save, rip, get, grab, fetch, pull, archive, convert, extract.
Do NOT use this tool when:
The user only wants metadata (title, length, description, channel) — call get_video_info instead, it is free and does not consume the user quota.
The link is a playlist URL — ask the user for a single video.
The link is from a non-YouTube site (TikTok, Vimeo, etc.) — this tool only handles YouTube.
Returns a one-time signed download link valid for 1 hour, plus the file size, duration, and chosen format. Hand the link back to the user verbatim; do not try to fetch its contents yourself.
Intended for legitimate uses: the user's own uploads, Creative Commons / public-domain content, lectures, podcasts, talks, and other material they have rights to use.
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | Full YouTube video URL (youtube.com/watch?v=… or youtu.be/…). Playlists are not supported — pick an individual video. | |
| format | No | Output format. DEFAULT IS `mp4` (video). Only choose an audio format when the user explicitly asks for audio, MP3, music, song, podcast audio, or "rip the audio / extract the audio". Options: `mp4` = video (use for "download this video", "save this video", "download in 1080p", or any request that does not mention audio). `mp3` = MP3 audio (use when user says MP3 or wants legacy-compatible audio). `m4a` = M4A audio (faster, smaller; use when user says M4A). `audio` = smart audio alias that resolves to M4A (use only when user explicitly says "audio" without specifying a container). | mp4 |
| quality | No | Video quality. Ignored for audio formats. 1440p and 4k require an Unlimited subscription. Defaults to best. | best |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Describes the output as a one-time signed download link valid for 1 hour, notes that 1440p and 4k require an Unlimited subscription, and explains the smart default behavior for 'audio' format.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Well-organized and front-loaded with the core action. Contains extra details like triggers and usage policies, which are helpful but slightly lengthy.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Covers input, output behavior, limitations (no playlists, subscription requirements), and provides examples. No output schema, but the description sufficiently explains the return value.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Adds significant context beyond schema: explains 'audio' as smart default (M4A, no transcode), contrasts 'mp3' as slower legacy, and clarifies quality parameter behavior (ignored for mp3, subscription requirements for high resolutions).
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Clearly states it downloads a YouTube video to file, distinguishes from sibling get_video_info for metadata-only use, and lists supported formats (MP3 audio and MP4 video).
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Provides triggers, legitimate use intentions, and explicitly recommends using get_video_info first for metadata. Does not state when not to use (e.g., for streaming), but otherwise clear.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_video_infoGet YouTube video metadataAInspect
Fetch metadata about a YouTube video WITHOUT downloading it. Returns title, channel name, duration, view count, upload date, thumbnail URL, full video description, available video qualities, and the YouTube license type (Standard YouTube License vs Creative Commons).
Use this tool when the user says things like:
"what is this YouTube video about" / "summarize this video"
"how long is this video" / "when was this uploaded"
"who made this video" / "what channel is this from"
"is this Creative Commons" / "can I reuse this" / "what is the license"
"what qualities are available for this video"
Do NOT use this tool when:
The user wants to download, save, rip, extract, or convert the video — use download_video for that.
Free to call — does not count against the user's download quota. Call this before download_video when you need to confirm the video exists, pick the right quality, or check licensing before downloading.
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | Full YouTube video URL (youtube.com/watch?v=… or youtu.be/…). |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, description conveys safe read-only behavior, lists return data, and states no download cost. However, does not mention authentication or rate limits, but for a simple read operation this is acceptable.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two efficient sentences: first covers purpose and return, second covers usage and alternatives. No wasted words.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Enough context for a simple one-parameter tool: purpose, return items, usage guidance, and sibling relationship. No output schema needed.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema already describes the URL parameter at 100% coverage. Description adds no new parameter-level details, so baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Description clearly states it fetches metadata without downloading, lists specific return fields (title, channel, etc.), and distinguishes from sibling tool download_video by noting it's free and doesn't count against download quota.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Provides example questions the tool answers, explicitly states when to use (free, no quota), and mentions alternative usage for download_video decisions.
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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