Best Video Downloader

Skip the learning curve of professional editing software. Describe what you want — download this YouTube video in MP4 format at the highest available resolut...

Security Scan

The skill's requirements and runtime instructions are internally consistent with a cloud-based video download/editing service, but it transmits user URLs/files to a third‑party API and will operate even if you don't supply a token (it will request an anonymous one).

Purpose & Capability

The skill declares a video-download/editing purpose and only requests an API token (NEMO_TOKEN) and a config path (~/.config/nemovideo/) that are reasonable for contacting a remote rendering service. The listed endpoints and operations (upload, render, SSE) match the stated functionality.

Instruction Scope

SKILL.md instructs the agent to send user-provided URLs and uploaded media to mega-api-prod.nemovideo.ai, create sessions, stream SSE, and poll render status. That is expected for a cloud render pipeline, but it means user files and URLs will be transmitted externally. It also instructs reading the skill's frontmatter and detecting install path to populate attribution headers (requires local file/path inspection), which is within-skill scope but may expose limited environment info.

Install Mechanism

No install spec and no code files (instruction-only). This is the lowest-risk install model — nothing is written to disk by the skill itself beyond what the platform typically does.

Credentials

Only NEMO_TOKEN is required (primary credential) and a config path for the service is listed. These are proportionate to a third-party API client. The instructions do not request other unrelated secrets. Note: if NEMO_TOKEN is missing the skill will obtain an anonymous token from the service automatically.

Persistence & Privilege

always:false and normal invocation settings. There is no install-time persistence or modification of other skills; the skill does not request elevated platform privileges.

Assessment

This skill delegates downloading and processing to a third-party service (mega-api-prod.nemovideo.ai). Using it will transmit any URLs and uploaded media to that backend, and the skill will create or reuse an API token (NEMO_TOKEN) — if you don't supply one it will obtain an anonymous token automatically. Before installing, consider: (1) Do you trust nemovideo.ai with the media and URLs you provide? (2) Are there copyright/privacy concerns with uploading content to a cloud service? (3) The skill reads its own frontmatter and inspects install paths to set attribution headers (minor environment info may be sent). If you prefer not to send media externally, use a local downloader (e.g., yt-dlp) or only use this skill with non-sensitive material. If you do proceed, verify the token source and review the service's privacy/terms and any billing/credit implications.

Getting Started

Share your online video URLs and I'll get started on video URL downloading. Or just tell me what you're thinking.

Try saying:

• "convert my online video URLs"
• "export 1080p MP4"
• "download this YouTube video in MP4"

Getting Connected

Before handling any user request, establish a connection to the backend API. Show a brief status like "Connecting...".

If NEMO_TOKEN is in the environment, use it directly and create a session. Otherwise, acquire a free starter token:

• Generate a UUID as client identifier
• POST to https://mega-api-prod.nemovideo.ai/api/auth/anonymous-token with the X-Client-Id header
• The response includes a token with 100 free credits valid for 7 days — use it as NEMO_TOKEN

Then create a session by POSTing to https://mega-api-prod.nemovideo.ai/api/tasks/me/with-session/nemo_agent with Bearer authorization and body {"task_name":"project","language":"en"}. The session_id in the response is needed for all following requests.

Tell the user you're ready. Keep the technical details out of the chat.

Best Video Downloader — Download and Save Online Videos

This tool takes your online video URLs and runs video URL downloading through a cloud rendering pipeline. You upload, describe what you want, and download the result.

Say you have a YouTube video URL at 1080p and want to download this YouTube video in MP4 format at the highest available resolution — the backend processes it in about 20-60 seconds and hands you a 1080p MP4.

Tip: shorter videos and lower resolutions download significantly faster.

Matching Input to Actions

User prompts referencing best video downloader, aspect ratio, text overlays, or audio tracks get routed to the corresponding action via keyword and intent classification.

User says...	Action	Skip SSE?
"export" / "导出" / "download" / "send me the video"	→ §3.5 Export	✅
"credits" / "积分" / "balance" / "余额"	→ §3.3 Credits	✅
"status" / "状态" / "show tracks"	→ §3.4 State	✅
"upload" / "上传" / user sends file	→ §3.2 Upload	✅
Everything else (generate, edit, add BGM…)	→ §3.1 SSE	❌

Cloud Render Pipeline Details

Each export job queues on a cloud GPU node that composites video layers, applies platform-spec compression (H.264, up to 1080x1920), and returns a download URL within 30-90 seconds. The session token carries render job IDs, so closing the tab before completion orphans the job.

Base URL: https://mega-api-prod.nemovideo.ai

Endpoint	Method	Purpose
/api/tasks/me/with-session/nemo_agent	POST	Start a new editing session. Body: {"task_name":"project","language":"<lang>"}. Returns session_id.
/run_sse	POST	Send a user message. Body includes app_name, session_id, new_message. Stream response with Accept: text/event-stream. Timeout: 15 min.
/api/upload-video/nemo_agent/me/<sid>	POST	Upload a file (multipart) or URL.
/api/credits/balance/simple	GET	Check remaining credits (available, frozen, total).
/api/state/nemo_agent/me/<sid>/latest	GET	Fetch current timeline state (draft, video_infos, generated_media).
/api/render/proxy/lambda	POST	Start export. Body: {"id":"render_<ts>","sessionId":"<sid>","draft":<json>,"output":{"format":"mp4","quality":"high"}}. Poll status every 30s.

Accepted file types: mp4, mov, avi, webm, mkv, jpg, png, gif, webp, mp3, wav, m4a, aac.

Skill attribution — read from this file's YAML frontmatter at runtime:

• X-Skill-Source: best-video-downloader
• X-Skill-Version: from frontmatter version
• X-Skill-Platform: detect from install path (~/.clawhub/ → clawhub, ~/.cursor/skills/ → cursor, else unknown)

Every API call needs Authorization: Bearer <NEMO_TOKEN> plus the three attribution headers above. If any header is missing, exports return 402.

Error Codes

• 0 — success, continue normally
• 1001 — token expired or invalid; re-acquire via /api/auth/anonymous-token
• 1002 — session not found; create a new one
• 2001 — out of credits; anonymous users get a registration link with ?bind=<id>, registered users top up
• 4001 — unsupported file type; show accepted formats
• 4002 — file too large; suggest compressing or trimming
• 400 — missing X-Client-Id; generate one and retry
• 402 — free plan export blocked; not a credit issue, subscription tier
• 429 — rate limited; wait 30s and retry once

SSE Event Handling

Event	Action
Text response	Apply GUI translation (§4), present to user
Tool call/result	Process internally, don't forward
heartbeat / empty data:	Keep waiting. Every 2 min: "⏳ Still working..."
Stream closes	Process final response

~30% of editing operations return no text in the SSE stream. When this happens: poll session state to verify the edit was applied, then summarize changes to the user.

Backend Response Translation

The backend assumes a GUI exists. Translate these into API actions:

Backend says	You do
"click [button]" / "点击"	Execute via API
"open [panel]" / "打开"	Query session state
"drag/drop" / "拖拽"	Send edit via SSE
"preview in timeline"	Show track summary
"Export button" / "导出"	Execute export workflow

Draft field mapping: t=tracks, tt=track type (0=video, 1=audio, 7=text), sg=segments, d=duration(ms), m=metadata.

Timeline (3 tracks): 1. Video: city timelapse (0-10s) 2. BGM: Lo-fi (0-10s, 35%) 3. Title: "Urban Dreams" (0-3s)

Common Workflows

Quick edit: Upload → "download this YouTube video in MP4 format at the highest available resolution" → Download MP4. Takes 20-60 seconds for a 30-second clip.

Batch style: Upload multiple files in one session. Process them one by one with different instructions. Each gets its own render.

Iterative: Start with a rough cut, preview the result, then refine. The session keeps your timeline state so you can keep tweaking.

Tips and Tricks

The backend processes faster when you're specific. Instead of "make it look better", try "download this YouTube video in MP4 format at the highest available resolution" — concrete instructions get better results.

Max file size is 500MB. Stick to MP4, WebM, MOV, AVI for the smoothest experience.

Export as MP4 for widest compatibility across devices and platforms.