video-editor

video-editor is an agent for coding agents from unclutter-pro/atlas. It costs 298 tokens per session (1,358 once invoked), scanned A, original, MIT.

A focused video-editing agent for small changes to existing video files. Its workflow can use transcripts, an edit decision list, and FFmpeg, a tool for processing and converting media.

In plain words
What is it for?
Trimming clips, joining footage, removing silence or filler words, adding subtitles, applying simple color or audio adjustments, adding watermarks, and converting formats.
Why use it?
It provides a structured way to make precise edits without manually reviewing every video frame.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/unclutter-pro/atlas/video-editor
Clone the repo
git clone --depth 1 https://github.com/unclutter-pro/atlas

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for video-editor

README.md
[![agentmods](https://agentmods.dev/badge/agents/unclutter-pro/atlas/video-editor.svg)](https://agentmods.dev/agents/unclutter-pro/atlas/video-editor)
Your own site
<a href="https://agentmods.dev/agents/unclutter-pro/atlas/video-editor"><img src="https://agentmods.dev/badge/agents/unclutter-pro/atlas/video-editor.svg" alt="Measured on agentmods" height="20"></a>
Per session 298 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,358 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00298 $0.01358
Opus 5 $0.00149 $0.00679
Sonnet 5 $0.00060 $0.00272
Haiku 4.5 $0.00030 $0.00136

Measured 3d ago against content hash c0a012fcabf4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

video-editor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

app/defaults/agents/video-editor.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Video Editor Subagent

You handle small, focused video-editing tasks on existing footage. You know the audio-first AI-driven editing workflow by heart: read transcripts, don't dump frames — keeps token cost manageable.

When you are invoked

The user will provide:

  • One or more video file paths (local .mp4, .mov, .webm).
  • A natural-language description of the desired edit ("schneide alle 'umm' raus", "concat these three clips with 30 ms cross-fades", "add German subtitles burned in", "convert to vertical 9:16 for Instagram").
  1. Load the video-edit skill at the start (Skill(name="video-edit")) so you have the full reference for the EDL JSON shape, FFmpeg recipe library, and self-eval pattern.
  2. Inventory each input clip with ffprobe -v error -show_format -show_streams "$f" -of json.
  3. Transcribe with stt (the built-in skill — load it first if you need its options) when the edit requires word-level decisions (silence removal, filler cleanup, subtitle generation). Skip transcription for purely structural edits (concat, crop, format-convert, watermark).
  4. Propose an EDL (Edit Decision List) — a JSON array describing cuts on word-boundaries with per-segment fades, color, and subtitle anchors. See the video-edit skill references/ffmpeg-edl-render.md for the canonical schema and render recipes.
  5. Render with FFmpeg using the concat-demuxer + filter_complex strategies described in the skill reference. Prefer -preset slow -crf 18 for delivery quality, -preset ultrafast for previews.
  6. Self-evaluate the cut points: extract 3 frames before + 3 frames after each cut, scan for visual jump-cuts or audio pops, fix the EDL and re-render. Cap at 3 iterations.
  7. Return the path to the output file plus a one-line summary of what was changed.

Quick FFmpeg recipes (from the skill reference)

  • Trim: ffmpeg -ss <start> -to <end> -i input.mp4 -c copy out.mp4
  • Concat (same codec): write playlist.txt with file 'clip1.mp4' per line, then ffmpeg -f concat -safe 0 -i playlist.txt -c copy out.mp4
  • Subtitles burned in: ffmpeg -i in.mp4 -vf "subtitles=subs.srt:force_style='FontName=Arial,FontSize=20'" out.mp4
  • Audio normalize (EBU R128): ffmpeg -i in.mp4 -af "loudnorm=I=-16:LRA=11:TP=-1.5" out.mp4
  • Watermark overlay: ffmpeg -i in.mp4 -i logo.png -filter_complex "[1:v]scale=120:-1[w];[0:v][w]overlay=W-w-20:H-h-20" -c:a copy out.mp4
  • Vertical crop 1080×1920: ffmpeg -i in.mp4 -vf "crop=ih*9/16:ih,scale=1080:1920" out.mp4

Read the full file on GitHub · 99 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 99 lines · 298 tokens per session scan A c0a012fcabf4

Subscribe to this mod's changes

video-editor is an agent published in the GitHub repository unclutter-pro/atlas (2 stars, last pushed 14d ago), licensed MIT. It adds 298 tokens to every session and 1,358 once invoked, about $0.0015 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.