slack-gif-creator

Knowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like "make me a GIF of X doing Y for Slack."

Install with Tessl CLI

npx tessl i github:boisenoise/skills-collections --skill slack-gif-creator

What are skills?

2.13x

Review — 81%

Does it follow best practices?

If you maintain this skill, you can automatically optimize it using the tessl CLI to improve its score:

npx tessl skill review --optimize ./path/to/skill

Learn more

Evaluation — 92%

↑ 2.13x

Agent success when using this skill

Validation — 11 / 11 Passed

Validation for skill structure

SKILL.md

Review

Evals

Evaluation results

Failed

Emoji GIF with bounce animation

84%

56%

Welcome Banner GIF for Slack Channel

Message GIF with slide animation

Criteria

Without context

With context

Message dimensions

100%

Slide easing

100%

Uses GIFBuilder

100%

draw_star helper

100%

Gradient background

100%

draw_text helper

Validates output

100%

Thick outlines

100%

62%

Contrasting outlines

100%

28%

FPS in valid range

100%

Colors in valid range

100%

No emoji fonts

100%

Failed

Pulsing heartbeat emoji animation

50%

Celebration Firework Burst Emoji

Particle burst explosion effect

Criteria

Without context

With context

Random particle angles

100%

Random velocities

100%

Gravity simulation

100%

Particle fade out

100%

RGBA or blend approach

50%

Uses GIFBuilder

Emoji dimensions

Optimize for emoji

Validates output

Gradient background

Thick drawing lines

Duration under 3 seconds

100%

44%

Energetic Star Reaction Emoji

Spinning star with shake effect

Criteria

Without context

With context

BICUBIC rotation

100%

Sine/cosine shake

100%

Random shake variation

100%

Combined animations

100%

Uses GIFBuilder

100%

Emoji dimensions

100%

Optimize for emoji

100%

Validates output

100%

PIL drawing primitives

100%

Thick outlines

100%

Layered star detail

100%

Gradient background

100%

No pre-packaged graphics

100%

Evaluated: 19 days ago
Agent: Claude Code

Table of Contents

Emoji GIF with bounce animation Welcome Banner GIF for Slack Channel Pulsing heartbeat emoji animation Celebration Firework Burst Emoji Energetic Star Reaction Emoji

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