README

Creates animated GIFs optimized for Slack — emoji (128x128) and message (480x480) sizes. Provides validation tools, easing functions, and size-optimized output. Scripts are available in both Python and TypeScript.

Prerequisites

Detect runtime availability and use whichever is present:

which python3 > /dev/null 2>&1 && echo "Python available" || echo "Use TypeScript"

Scripts

Slack Size Limits

Quick Start (Python)

pip install Pillow imageio

python3 - <<'EOF'
from scripts.python.gif_builder import GIFBuilder
from PIL import Image, ImageDraw

builder = GIFBuilder(width=128, height=128, fps=10)
for i in range(12):
    frame = Image.new('RGB', (128, 128), (30, 30, 40))
    builder.add_frame(frame)
builder.save('emoji.gif', num_colors=48, optimize_for_emoji=True)
EOF

Quick Start (TypeScript)

npm install sharp
npx tsx scripts/ts/gif-builder.ts

SKILL.md

A toolkit providing utilities and knowledge for creating animated GIFs optimized for Slack.

When to Activate

• User wants to create an animated GIF for Slack (emoji or message)
• User asks to animate an uploaded image or concept for Slack
• User needs a GIF that meets Slack’s size and format constraints

Skip When

• User wants a static logo or poster — use codi-canvas-design
• User wants generative / interactive p5.js art — use codi-algorithmic-art
• User wants a screen recording or video — this skill produces frame-composed GIFs only
• User wants a web artifact with CSS animation — use codi-frontend-design

Slack Requirements

Dimensions:

• Emoji GIFs: 128x128 (recommended)
• Message GIFs: 480x480

Parameters:

• FPS: 10-30 (lower is smaller file size)
• Colors: 48-128 (fewer = smaller file size)
• Duration: Keep under 3 seconds for emoji GIFs

Script Runtime

Helper scripts are available in both TypeScript and Python. Detect availability and use the appropriate variant:

• TypeScript (always available): npx tsx ${CLAUDE_SKILL_DIR}/scripts/ts/<script>.ts <args>
• Python (when installed): python3 ${CLAUDE_SKILL_DIR}/scripts/python/<script>.py <args>

Check availability: which python3 > /dev/null 2>&1 — if Python is not found, use TypeScript.

Core Workflow

Python (uses PIL/Pillow + imageio):

from python.gif_builder import GIFBuilder
from PIL import Image, ImageDraw

# 1. Create builder
builder = GIFBuilder(width=128, height=128, fps=10)

# 2. Generate frames
for i in range(12):
    frame = Image.new('RGB', (128, 128), (240, 248, 255))
    draw = ImageDraw.Draw(frame)

    # Draw your animation using PIL primitives
    # (circles, polygons, lines, etc.)

    builder.add_frame(frame)

# 3. Save with optimization
builder.save('output.gif', num_colors=48, optimize_for_emoji=True)

TypeScript (uses sharp + SVG composition):

import { GIFBuilder } from "./ts/gif-builder.js";
import { createBlankFrameSvg, circleSvg, composeSvgFrame, svgToPng } from "./ts/frame-composer.js";

const builder = new GIFBuilder(128, 128, 10);

for (let i = 0; i < 12; i++) {
  const bg = createBlankFrameSvg(128, 128, { r: 240, g: 248, b: 255 });
  const svg = composeSvgFrame(128, 128, bg, [/* your elements */]);
  const png = await svgToPng(svg, 128, 128);
  if (png) builder.addFrame(png);
}

await builder.save('output.gif', 48, true);

Drawing Graphics

Working with User-Uploaded Images

If a user uploads an image, consider whether they want to:

• Use it directly (e.g., “animate this”, “split this into frames”)
• Use it as inspiration (e.g., “make something like this”)

Load and work with images using PIL:

from PIL import Image

uploaded = Image.open('file.png')
# Use directly, or just as reference for colors/style

Drawing from Scratch

When drawing graphics from scratch, use PIL ImageDraw primitives:

from PIL import ImageDraw

draw = ImageDraw.Draw(frame)

# Circles/ovals
draw.ellipse([x1, y1, x2, y2], fill=(r, g, b), outline=(r, g, b), width=3)

# Stars, triangles, any polygon
points = [(x1, y1), (x2, y2), (x3, y3), ...]
draw.polygon(points, fill=(r, g, b), outline=(r, g, b), width=3)

# Lines
draw.line([(x1, y1), (x2, y2)], fill=(r, g, b), width=5)

# Rectangles
draw.rectangle([x1, y1, x2, y2], fill=(r, g, b), outline=(r, g, b), width=3)

Don’t use: Emoji fonts (unreliable across platforms) or assume pre-packaged graphics exist in this skill.

Making Graphics Look Good

Graphics should look polished and creative, not basic. Here’s how:

Use thicker lines - Always set width=2 or higher for outlines and lines. Thin lines (width=1) look choppy and amateurish.

Add visual depth:

• Use gradients for backgrounds (create_gradient_background)
• Layer multiple shapes for complexity (e.g., a star with a smaller star inside)

Make shapes more interesting:

• Don’t just draw a plain circle - add highlights, rings, or patterns
• Stars can have glows (draw larger, semi-transparent versions behind)
• Combine multiple shapes (stars + sparkles, circles + rings)

Pay attention to colors:

• Use vibrant, complementary colors
• Add contrast (dark outlines on light shapes, light outlines on dark shapes)
• Consider the overall composition

For complex shapes (hearts, snowflakes, etc.):

• Use combinations of polygons and ellipses
• Calculate points carefully for symmetry
• Add details (a heart can have a highlight curve, snowflakes have intricate branches)

Be creative and detailed! A good Slack GIF should look polished, not like placeholder graphics.

Available Utilities

GIFBuilder (python.gif_builder / ts/gif-builder)

Assembles frames and optimizes for Slack:

builder = GIFBuilder(width=128, height=128, fps=10)
builder.add_frame(frame)  # Add PIL Image
builder.add_frames(frames)  # Add list of frames
builder.save('out.gif', num_colors=48, optimize_for_emoji=True, remove_duplicates=True)

Validators (python.validators / ts/validators)

Check if GIF meets Slack requirements:

from python.validators import validate_gif, is_slack_ready

# Detailed validation
passes, info = validate_gif('my.gif', is_emoji=True, verbose=True)

# Quick check
if is_slack_ready('my.gif'):
    print("Ready!")

Easing Functions (python.easing / ts/easing)

Smooth motion instead of linear:

from python.easing import interpolate

# Progress from 0.0 to 1.0
t = i / (num_frames - 1)

# Apply easing
y = interpolate(start=0, end=400, t=t, easing='ease_out')

# Available: linear, ease_in, ease_out, ease_in_out,
#           bounce_out, elastic_out, back_out

Frame Helpers (python.frame_composer / ts/frame-composer)

Convenience functions for common needs:

from python.frame_composer import (
    create_blank_frame,         # Solid color background
    create_gradient_background,  # Vertical gradient
    draw_circle,                # Helper for circles
    draw_text,                  # Simple text rendering
    draw_star                   # 5-pointed star
)

Animation Concepts

Shake/Vibrate

Offset object position with oscillation:

• Use math.sin() or math.cos() with frame index
• Add small random variations for natural feel
• Apply to x and/or y position

Pulse/Heartbeat

Scale object size rhythmically:

• Use math.sin(t * frequency * 2 * math.pi) for smooth pulse
• For heartbeat: two quick pulses then pause (adjust sine wave)
• Scale between 0.8 and 1.2 of base size

Bounce

Object falls and bounces:

• Use interpolate() with easing='bounce_out' for landing
• Use easing='ease_in' for falling (accelerating)
• Apply gravity by increasing y velocity each frame

Spin/Rotate

Rotate object around center:

• PIL: image.rotate(angle, resample=Image.BICUBIC)
• For wobble: use sine wave for angle instead of linear

Fade In/Out

Gradually appear or disappear:

• Create RGBA image, adjust alpha channel
• Or use Image.blend(image1, image2, alpha)
• Fade in: alpha from 0 to 1
• Fade out: alpha from 1 to 0

Slide

Move object from off-screen to position:

• Start position: outside frame bounds
• End position: target location
• Use interpolate() with easing='ease_out' for smooth stop
• For overshoot: use easing='back_out'

Zoom

Scale and position for zoom effect:

• Zoom in: scale from 0.1 to 2.0, crop center
• Zoom out: scale from 2.0 to 1.0
• Can add motion blur for drama (PIL filter)

Explode/Particle Burst

Create particles radiating outward:

• Generate particles with random angles and velocities
• Update each particle: x += vx, y += vy
• Add gravity: vy += gravity_constant
• Fade out particles over time (reduce alpha)

Optimization Strategies

Only when asked to make the file size smaller, implement a few of the following methods:

1. Fewer frames - Lower FPS (10 instead of 20) or shorter duration
2. Fewer colors - num_colors=48 instead of 128
3. Smaller dimensions - 128x128 instead of 480x480
4. Remove duplicates - remove_duplicates=True in save()
5. Emoji mode - optimize_for_emoji=True auto-optimizes

# Maximum optimization for emoji
builder.save(
    'emoji.gif',
    num_colors=48,
    optimize_for_emoji=True,
    remove_duplicates=True
)

Philosophy

This skill provides:

• Knowledge: Slack’s requirements and animation concepts
• Utilities: GIFBuilder, validators, easing functions
• Flexibility: Create the animation logic using PIL primitives

It does NOT provide:

• Rigid animation templates or pre-made functions
• Emoji font rendering (unreliable across platforms)
• A library of pre-packaged graphics built into the skill

Note on user uploads: This skill doesn’t include pre-built graphics, but if a user uploads an image, use PIL to load and work with it - interpret based on their request whether they want it used directly or just as inspiration.

Be creative! Combine concepts (bouncing + rotating, pulsing + sliding, etc.) and use PIL’s full capabilities.

Dependencies

Python:

pip install pillow imageio numpy

TypeScript:

npm install sharp