---

name: imagemagick description: Edit and convert images with the ImageMagick magick CLI — resize, crop, convert format, compress, rotate, montage, annotate. Use for any still-image transformation. version: 1.0.1 requires_tools:

• os.shell.run
• vision.describe dangerous: false

---

imagemagick

Transform still images with ImageMagick v7 (magick command). Pairs well with vision.describe — describe an image to decide what to do, then operate on it here. Always write to a new output file.

ImageMagick v7 uses magick in.png out.jpg. Legacy v6 uses convert; if only convert exists, substitute it for magick in the examples below.

Setup health check (run first, every session)

Verify with one solo step:

[{ "tool": "os.shell.run", "args": { "cmd": "magick", "args": ["--version"] } }]

Outcome map:

• exit 0 + Version: ImageMagick 7… → ready, proceed.
• command not found: magick → try convert --version (v6); if also missing → enter Setup playbook → "imagemagick missing".

Setup playbook (when prerequisites are missing)

imagemagick missing

Reply (solo reply step):

"ImageMagick is not installed. I can install it: brew install imagemagick. Install it?"

On yes:

[{ "tool": "os.shell.run", "args": { "cmd": "brew", "args": ["install", "imagemagick"] } }]

On Linux: apt-get install imagemagick.

When to use

• "Resize / crop / rotate this image", "convert PNG to JPG / WebP".
• "Compress this image", "make a thumbnail", "combine images into a montage".
• "Add a text caption / watermark to this image".

When NOT to use

• Understanding image content — use vision.describe instead.
• Video frames / animation encoding — use the ffmpeg skill.
• Multi-page PDF assembly from images — use the pdf skill (magick can make a PDF but page-level control lives in pdf).

Common operations

All examples invoke os.shell.run with cmd: "magick". The approval gate surfaces each write.

Goal	args
Inspect dimensions/format	["identify", "in.png"]
Convert PNG → JPG	["in.png", "out.jpg"]
Convert → WebP	["in.png", "-quality", "82", "out.webp"]
Resize to 800px wide	["in.jpg", "-resize", "800x", "out.jpg"]
Thumbnail (fit 200x200)	["in.jpg", "-thumbnail", "200x200", "thumb.jpg"]
Crop 300x300 from 10,10	["in.png", "-crop", "300x300+10+10", "+repage", "crop.png"]
Rotate 90°	["in.jpg", "-rotate", "90", "rot.jpg"]
Compress JPG quality 75	["in.jpg", "-quality", "75", "small.jpg"]
Montage 2x2 grid	["montage", "a.png", "b.png", "c.png", "d.png", "-tile", "2x2", "-geometry", "+4+4", "grid.png"]
Add caption	["in.jpg", "-pointsize", "36", "-annotate", "+20+40", "Hello", "out.jpg"]

Rules

1. Always write to a NEW output path; never overwrite the source image.
2. Use magick identify first to learn dimensions/format before transforming.
3. After a transform, optionally vision.describe the result to confirm it matches the user's intent for visual tasks.
4. Echo the output path and final dimensions after each operation.