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.
npx skills add tdimino/claude-code-minoan --skill photo-to-slack-emojigit clone --depth 1 https://github.com/tdimino/claude-code-minoanWrote 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.
[](https://agentmods.dev/skills/tdimino/claude-code-minoan/photo-to-slack-emoji)<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.
<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>- NVIDIA SkillSpector warn
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.
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 5.5 | $0.00027 | $0.01329 |
| Sonnet 5.5 | $0.00014 | $0.00665 |
| Haiku 4.5 | $0.00007 | $0.00332 |
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 1mo ago.
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.
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
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.
- core/__init__.py 1.1 KB runs code
- core/background_remover.py 5.7 KB runs code
- core/gemini_client.py 11 KB runs code
- core/optimizer.py 8.2 KB runs code
- core/photo_to_emoji.py 12 KB runs code
- core/preview.py 6.0 KB runs code
- core/validators.py 7.5 KB runs code
- edit_image.py 2.7 KB runs code
- example_usage.py 8.8 KB runs code
- INSTALL.md 2.9 KB
- README.md 9.7 KB
- references/gemini-api-docs.md 87 KB
- references/slack-emoji-specs.md 9.1 KB
- requirements.txt 232 B
- templates/style_examples.md 11 KB
- templates/style_prompts.json 4.5 KB
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.
- 1mo ago Changed · +5 lines · +68 tokens per session bc7ae929162c
- 1mo ago First seen · 441 lines · 0 tokens per session scan A 97bb2aef8506
photo-to-slack-emoji is a skill published in the GitHub repository tdimino/claude-code-minoan (41 stars, last pushed 8d ago), licensed MIT. It adds 68 tokens to every session and 3,323 once invoked, about $0.0003 per session on Opus 5.5. 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.
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