What is photo-to-slack-emoji?

An image tool that turns photos into Slack custom emojis and can edit existing emoji images from written instructions. Slack emojis are small images used in team chat, so the tool also checks their size and file limits.

Use it to convert people, pets, objects, or ideas into emoji-style images, add or change visual details, and optimize the result for Slack's requirements.

A normal photo is usually too large or detailed for a useful Slack emoji. This prepares a recognizable, compact image and can adjust it with further edits.

photo-to-slack-emoji — Skill for Claude Code and Codex by tdimino

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add tdimino/claude-code-minoan --skill photo-to-slack-emoji

Clone the repo

git clone --depth 1 https://github.com/tdimino/claude-code-minoan

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/tdimino/claude-code-minoan/photo-to-slack-emoji/github.svg)](https://agentmods.dev/skills/tdimino/claude-code-minoan/photo-to-slack-emoji)

Your own site

<a href="https://agentmods.dev/skills/tdimino/claude-code-minoan/photo-to-slack-emoji"><img src="https://agentmods.dev/badge/skills/tdimino/claude-code-minoan/photo-to-slack-emoji/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/tdimino/claude-code-minoan/photo-to-slack-emoji"><img src="https://agentmods.dev/badge/skills/tdimino/claude-code-minoan/photo-to-slack-emoji.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,323 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Rogue Agent · line 77
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00068	$0.03323
Opus 5	$0.00034	$0.01662
Sonnet 5	$0.00014	$0.00665
Haiku 4.5	$0.00007	$0.00332

Measured 7d ago against content hash bc7ae929162c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

photo-to-slack-emoji scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

The scan reads SKILL.md. This mod also ships 9 executable files (core/__init__.py, core/background_remover.py, core/gemini_client.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/design-media/photo-to-slack-emoji/SKILL.md · 446 lines

How it starts

The opening of the file, as written. The whole thing — 446 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Photo to Slack Emoji Converter & Image Editor

Transform any photo into a classic Slack-optimized emoji using Google's Nano Banana Pro (Gemini 3 Pro Image) model with automatic subject identification and style transformation. NEW: Edit existing images with natural language prompts!

When to Use This Skill

Use this skill when:

Converting photos into Slack custom emojis
Editing existing images/emojis (add hats, change colors, add accessories, etc.)
Creating icon-style representations of people, pets, objects, or concepts
Need automatic subject identification and isolation
Transforming photos to match classic emoji aesthetics (flat, simple, expressive)
Ensuring Slack's strict 64KB file size and dimension requirements are met

Overview

This skill combines:

Google Nano Banana Pro (Gemini 3 Pro Image) - AI-powered subject identification, style transformation, and image editing with superior quality
Slack Emoji Validators - Ensures compliance with Slack's 64KB limit and optimal dimensions
Automatic Optimization - Color quantization, compression, and size validation

Two Main Workflows

1. Photo-to-Emoji Conversion (Original)

Photo Input → Gemini Identifies Subject → Transform to Emoji Style → Optimize for Slack → Validate

2. Image Editing (NEW!)

Existing Image → Natural Language Edit Prompt → Gemini Edits Image → Optimize (optional) → Save

How It Works

Photo Input → Gemini Identifies Subject → Transform to Emoji Style → Optimize for Slack → Validate

Workflow Steps:

Upload photo - Provide path to source image
AI identifies subject - Gemini's visual reasoning determines the main subject
Style transformation - Converts to emoji/icon/sticker style with descriptive prompt
Optimization - Reduces to 128x128, limits colors to 32-48, compresses to <64KB
Validation - Confirms Slack requirements are met

Quick Start

Basic Photo-to-Emoji Usage

Read the full file on GitHub · 446 lines

Files

What ships with it

16 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

7d ago Changed · +5 lines · +68 tokens per session bc7ae929162c
9d ago First seen · 441 lines · 0 tokens per session scan A 97bb2aef8506

Subscribe to this mod's changes

photo-to-slack-emoji is a skill published in the GitHub repository tdimino/claude-code-minoan (41 stars, last pushed 2d ago), licensed MIT. It adds 68 tokens to every session and 3,323 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Claude Code Creative and media Productivity claude-code-skills cli-app minoan open-source

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