Agent skill · Anthropic

Slack GIF Creator skill for Claude Code, Codex and Cursor

Makes small animated GIFs sized and validated for Slack's emoji and message limits.

Officialname: slack-gif-creator★ 184k (repo)pushed 2026-10-09See repoSKILL.md on GitHubchecked 2026-11-07

What it does, in the publisher's words

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."

The description field of the SKILL.md. The agent reads only this at startup and decides from it when to load the full skill.

Install Slack GIF Creator

The skills CLI copies the skill into the folder of each agent you pick (Claude Code, Codex, Cursor, Copilot, Gemini CLI, OpenCode, Windsurf...). Add -g for all projects. Needs Node.js 22.20+. docs

npx skills add anthropics/skills --skill slack-gif-creator

This repo is a plugin marketplace. Inside Claude Code, add it and install the plugin that holds the skill (document-skills, example-skills, claude-api, academy-guide...), or copy only this skill into ~/.claude/skills. docs

/plugin marketplace add anthropics/skills
/plugin install <plugin>@anthropic-agent-skills

# or only this skill:
npx skills add anthropics/skills --skill slack-gif-creator -a claude-code

Download the skill folder, zip it, then Customize > Skills > + > Create skill > Upload a skill. Code execution must be on (Settings > Capabilities). docs

git clone --depth 1 https://github.com/anthropics/skills.git /tmp/slack-gif-creator-src
cp -r /tmp/slack-gif-creator-src/skills/slack-gif-creator ./slack-gif-creator
zip -r slack-gif-creator.zip slack-gif-creator

Codex reads skills from .agents/skills in the repo or ~/.agents/skills. Type $ in Codex to use one. docs

npx skills add anthropics/skills --skill slack-gif-creator -a codex

gh skill (GitHub CLI 2.90+, preview) installs it for Copilot in VS Code, the CLI and the cloud agent. Copilot also reads .github/skills and ~/.copilot/skills. docs

gh skill install anthropics/skills slack-gif-creator

Cursor reads .cursor/skills, .agents/skills and ~/.cursor/skills (and .claude/skills). It does not install loose skills from a GitHub URL, so copy it in. docs

npx skills add anthropics/skills --skill slack-gif-creator -a cursor

Installs from the GitHub repo; --path picks this skill out of the repo. Default scope is user (all projects). docs

gemini skills install https://github.com/anthropics/skills.git --path skills/slack-gif-creator

OpenCode reads .opencode/skills, ~/.config/opencode/skills and the Claude and .agents folders. docs

npx skills add anthropics/skills --skill slack-gif-creator -a opencode

Windsurf (now Devin Desktop) reads .devin/skills, .windsurf/skills and ~/.codeium/windsurf/skills. docs

npx skills add anthropics/skills --skill slack-gif-creator -a windsurf

Works with

Claude Code, Claude.ai and Claude Desktop, Codex, GitHub Copilot, Cursor, Gemini CLI, OpenCode, Windsurf and other agents that read the open Agent Skills format.

Bundles 4 Python scripts the agent can run, so it needs Python on the machine. In the Claude apps, code execution must be on.

What's in the SKILL.md

23 sections

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

Bundled files

LICENSE.txt
core/easing.py
core/frame_composer.py
core/gif_builder.py
core/validators.py
requirements.txt

Loaded only when the instructions point to them.

Facts

Skill name: slack-gif-creator
Publisher: Anthropic (official)
Repo: anthropics/skills
License: Complete terms in LICENSE.txt
SKILL.md size: 780 words, 249 lines
Bundled files: 6, 4 scripts (Python), 1 docs
Repo stars: 184k (as of 2026-10-24)
SKILL.md checked: 2026-11-07

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Related media skills

FAQ

What does the slack-gif-creator skill do?+

Makes small animated GIFs sized and validated for Slack's emoji and message limits. In its own SKILL.md, Anthropic describes it as: "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 do I install the slack-gif-creator skill?+

Run npx skills add anthropics/skills --skill slack-gif-creator and pick your agents, or use the tab for your agent above. In Claude Code the skill ends up in ~/.claude/skills/slack-gif-creator/SKILL.md; in Codex and Cursor in .agents/skills/slack-gif-creator/.

Does Slack GIF Creator work in Codex, Cursor and Copilot, or only Claude?+

It's a standard SKILL.md, so any agent that reads the Agent Skills format can use it: Claude Code, the Claude apps, Codex, GitHub Copilot, Cursor, Gemini CLI, OpenCode, Windsurf and more.

Who maintains Slack GIF Creator?+

Anthropic, the company or project behind it, in the anthropics/skills repo on GitHub, last pushed 2026-10-09. License: Complete terms in LICENSE.txt.

Read a skill's SKILL.md and scripts before you install it: skills aren't verified by any agent vendor. Claude skills marketplace · How to install skills · MCP servers