Claude skill · Design and art · Anthropic

Slack GIF creator skill for Claude

Makes animated GIFs sized and compressed for Slack, with Python helpers for frames, easing and file-size checks.

Command: /slack-gif-creator
Licence: Apache-2.0, copying allowed with attribution
Folder: 7 files, 43 KB
Runs code: 4 scripts

Overview

What it does

The skill encodes Slack’s practical limits (small square emoji GIFs, larger message GIFs, frame rate and colour count as the levers for file size) and ships a small Python library in core/ for building frames, easing motion and validating the result.

The rest is a catalogue of animation ideas, such as shake, pulse and bounce, with short notes on building each one with Pillow’s drawing tools, from scratch or from an uploaded image.

Triggers

When Claude uses it

Requests like “make me a GIF of X doing Y for Slack”.

Its description, which Claude matches against

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."

What it needs

Python with Pillow, imageio, imageio-ffmpeg and NumPy (listed in requirements.txt).

Install

How to install it

Claude Code

Plugin (type in Claude Code)

/plugin marketplace add anthropics/skills
/plugin install example-skills@anthropic-agent-skills

The example-skills plugin installs 12 skills from this repository, including this one. Its skills are then namespaced, such as /example-skills:slack-gif-creator.

Or copy the folder (shell)

git clone --depth 1 https://github.com/anthropics/skills.git
mkdir -p ~/.claude/skills
cp -r skills/skills/slack-gif-creator ~/.claude/skills/

That makes it a personal skill, available as /slack-gif-creator in all your projects. Copy it into .claude/skills/ in a repository instead to share it with your team.

claude.ai and the Claude API

Zip the skill folder, then in claude.ai open Customize > Skills, choose + and Create skill, then Upload a skill. Code execution must be turned on.

Upload with the Python SDK

from anthropic import Anthropic
from anthropic.lib import files_from_dir

client = Anthropic()
skill = client.skills.create(files=files_from_dir("slack-gif-creator"))
print(skill.id)  # use as a custom skill_id with the code execution tool

Checks

SKILL.md validator results

Its SKILL.md (254 lines) run through our SKILL.md validator, with the folder’s file list, for both targets. These check the file’s format, not whether the skill works well.

Claude Code

0 errors, 0 warnings, 0 tips

claude.ai and the API

0 errors, 0 warnings, 1 tip

tipThe Claude Help Center’s upload guide gives a 200-character description limit for claude.ai, though the platform docs say 1,024. Keep it under 200 if you’ll upload it there.

Folder

What’s in the folder

LICENSE.txt11 KB
requirements.txt66 B
SKILL.md7.7 KB
core/4 files, 24 KB

SKILL.md sections

Slack GIF Creator
Slack Requirements
Core Workflow
Drawing Graphics
Working with User-Uploaded Images
Drawing from Scratch
Making Graphics Look Good
Available Utilities
GIFBuilder (core.gif_builder)
Validators (core.validators)
Easing Functions (core.easing)
Frame Helpers (core.frame_composer)
Animation Concepts
Shake/Vibrate
Pulse/Heartbeat
Bounce
Spin/Rotate
Fade In/Out
Slide
Zoom
Explode/Particle Burst
Optimization Strategies
Philosophy
Dependencies

Source

Licence and source

Published by Anthropic in anthropics/skills/skills/slack-gif-creator, last changed 2026-04-20.
Licence: Apache-2.0, copying allowed with attribution. Our copy of the SKILL.md is unmodified, served with its licence.
Read from commit dbd4588; write-up checked 2026-10-14.
Before installing, read the SKILL.md on GitHub and its scripts. Anthropic advises using skills only from sources you trust (security considerations).

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What it does

When Claude uses it

What it needs

How to install it

Claude Code

claude.ai and the Claude API

SKILL.md validator results

Claude Code

claude.ai and the API

What’s in the folder

SKILL.md sections

Licence and source

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