Slack GIF Creator Skill - Custom GIFs with Claude

Source: Content adapted from anthropics/skills (MIT). Last synced July 8, 2026, against the April 20, 2026 upstream update.

Overview

The official description: "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.'"

How the skill works

The SKILL.md pairs Slack's hard requirements (dimensions, file size) with a small Python animation toolkit:

• Core workflow - draw graphics (from scratch or from user-uploaded images), compose frames, build the GIF, validate against Slack constraints
• core.gif_builder - GIFBuilder assembles frames into a compliant GIF
• core.validators - checks size and dimension limits before you ship
• core.easing + core.frame_composer - easing functions and frame helpers for smooth motion
• Animation concepts - named recipes like shake/vibrate and pulse/heartbeat that map user requests to concrete frame math

What's inside the skill folder

• core/gif_builder.py, core/validators.py, core/easing.py, core/frame_composer.py
• requirements.txt, SKILL.md, LICENSE.txt

Key takeaways for your own skills

• Constraints first: encoding the platform's limits as a validator means output is correct by construction, not by luck.
• Naming animation concepts ("pulse", "shake") gives users a vocabulary the skill can reliably map to code.

See it on GitHub

skills/slack-gif-creator