slack-gif-creator

An agent skill by anthropics, from anthropics/skills. Tags: anthropic, design, generative, slack, visual-art.

What it does

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 the skills CLI, which installs into Claude Code, Codex, Cursor and other agents:

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

Or copy the skill folder into Claude Code's skills directory by hand (~/.claude/skills for every project, or .claude/skills inside one):

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

Safety box score

Grade B, low risk: 14 of 100 risk points, rated 2026-10-15. The grade rates what the skill and its scripts can reach on the machine of whoever installs it, across eight categories from shell execution to secrets access. How the score works.

This skill is a local GIF-making toolkit: it reads image/GIF files, generates frames with Pillow, and writes optimized GIFs to a path you choose. The main risks are routine package downloads during setup and ordinary file access to whatever input/output paths the agent is given; it does not reach remote services or require elevated privileges on its own.

Category levels, from 0 (none) to 3 (high)
Category	Level	Why
Code & shell execution	1 (low)	It runs local Python image-processing code in `core/gif_builder.py`, `core/frame_composer.py`, and `core/validators.py` (for example `imageio.imwrite(...)` and Pillow `resize/quantize` calls), but there is no shelling out or code evaluation.
Network access	2 (moderate)	Setup explicitly downloads third-party packages via `pip install pillow imageio numpy`, and `requirements.txt` adds `imageio-ffmpeg>=0.4.9`, so installing the skill pulls code from external package indexes.
Filesystem reach	1 (low)	The helpers read and write caller-supplied paths such as `validate_gif(gif_path)` and `GIFBuilder.save(output_path)`, but the code shown stays within ordinary file I/O and does not target system areas or dotfiles.
Secrets & credentials	0 (none)	No code or instructions access API keys, browser sessions, `.env` files, or other secret stores.
Privilege & persistence	0 (none)	There is no use of sudo, global installs, services, scheduled tasks, or shell/OS configuration changes.
Instruction hijack surface	0 (none)	The files do not tell the agent to ignore rules, hide behavior, follow remote instructions, or take on a deceptive persona.
Irreversible actions	0 (none)	The skill creates and validates GIFs only; it does not post, deploy, pay, delete, or otherwise act independently on external systems.
Transparency	0 (none)	All shipped files are readable source or text; there are no binaries, minified blobs, or runtime-downloaded installers in the skill itself.

Before installing

Review `requirements.txt` and expect a PyPI download (`imageio-ffmpeg` included).
Run it first in a scratch directory with a benign local image/GIF.
Make sure the output path you pass to `GIFBuilder.save()` is where you want the file written.
If you care about dependency risk, pin/install the packages yourself before letting an agent use the skill.

Rated 2026-10-15 by an automated review of 7 files from the skill's repository.

Source

Repository: anthropics/skills (all skills from this repository)
Path: skills/slack-gif-creator/SKILL.md
Branch: main
Updated: 2026-09-19

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