#What it does

The Slack GIF Creator skill provides a complete toolkit for creating animated GIFs optimized for Slack, including size constraints, validation tools, easing functions, frame composition helpers, and animation concept guidance. It uses PIL/Pillow for drawing and a custom GIFBuilder for assembly and optimization.

#How to use

Activate when users request animated GIFs for Slack.

Make me a GIF of a bouncing ball for Slack

Create an animated emoji GIF of a spinning star

#Skill instructions

#Slack Requirements

| Type | Dimensions | FPS | Duration | |------|-----------|-----|----------| | Emoji GIFs | 128x128 | 10-30 | Under 3 seconds | | Message GIFs | 480x480 | 10-30 | Flexible |

#Core Workflow

1. Create a GIFBuilder with target dimensions and FPS
2. Generate frames using PIL drawing primitives (circles, polygons, lines, rectangles)
3. Save with optimization (color reduction, duplicate frame removal)

#Available Utilities

• GIFBuilder: Frame assembly and Slack-optimized output
• Validators: Check if GIF meets Slack requirements
• Easing Functions: Smooth motion (ease_in, ease_out, bounce_out, elastic_out, back_out)
• Frame Helpers: Blank frames, gradient backgrounds, shape helpers

#Animation Concepts

• Shake/Vibrate: Oscillating position offsets with sin()/cos()
• Pulse/Heartbeat: Rhythmic size scaling
• Bounce: Gravity simulation with easing
• Spin/Rotate: Angle-based rotation with optional wobble
• Fade In/Out: Alpha channel manipulation
• Slide: Off-screen to position with easing
• Explode/Particle Burst: Radial particle systems with decay

#Design Quality

• Use thick lines (width 2+) for polished appearance
• Add visual depth with gradients and layered shapes
• Use vibrant, complementary colors with strong contrast
• Combine animation concepts for more dynamic results

This skill is from the Anthropic Skills Repository.