illo

A system for creating original editorial illustrations in which a recurring mascot explains one idea through a scene, short comic, diagram, or transparent cutout. The illustrations can show flows, stages, timelines, loops, or other connected structures.

In plain words
What is it for?
Use it to make article illustrations, labeled process diagrams, mini-comics, or reusable mascot images for later layouts.
Why use it?
It gives written content a consistent visual way to explain a judgment, process, trap, or change.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/tmchow/illo-skill/illo
Any agent
npx skills add tmchow/illo-skill --skill illo
Clone the repo
git clone --depth 1 https://github.com/tmchow/illo-skill

Made for: Claude Code, Codex.

Per session 169 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 11,884 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00169 $0.11884
Opus 5 $0.00084 $0.05942
Sonnet 5 $0.00034 $0.02377
Haiku 4.5 $0.00017 $0.01188

Measured yesterday against content hash 592503f91a15, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

illo 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 yesterday.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/diagram_route.py, scripts/illo.py, scripts/repair-hermes-assets.sh), 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/illo/SKILL.md · 720 lines

How it starts

The opening of the file, as written. The whole thing — 720 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Illo

Make original, distinctive editorial illustrations for written content. One image explains one idea: a key judgment, a flow, a before/after, a trap, a loop. A recurring mascot is the one performing the idea in every scene — the subject, never decoration. When one idea advances through stages, it can be a mini-comic: 2–4 panels inside a single image. And when the idea is itself a traceable structure — a pipeline, labeled stages, a fan-out, a timeline, a loop — it can be an explainer: the same mascot and look drawing the structure as a hand-built sketch-diagram with arrows and callouts (references/composition.md, "Two registers" and "Pick the diagram type"; editorial scene is always the default). A named pipeline or recipe is labeled stages inside that register — named phases in order, one connected system, pack-solved for this body, never a new look. Or a character cutout: the mascot alone on a transparent PNG for downstream overlay — pose and contact continuity only, no idea, no text, no environment (references/cutout.md).

This is a configurable house style, not a generic image generator. The methodology is the constant; the character pack and palette are the parameters — and a character pack carries its style with it: one look per pack, chosen from the bundled look library (riso — grainy halftone, ink-layer offset, paper grain, one bold softly-rounded outline — plus blueprint, woodcut, pixel, clay, manila, chalk, phosphor, enamel, gouache, felt, diorama, sketchbook, bricks, fizz, bloom, and snes) or a custom style file. The default mascot is Blot, a deadpan ink-drop in riso. Palettes come from presets, the user's own palette file, or one derived color. Whatever the parameters, it is intentionally not a photo — with one deliberate exception, the bricks look, a toy-brick photography style — not a logo, not a corporate infographic, not a formal boxes-and-diamonds flowchart look, not a UI mockup. Asking for a flowchart still means labeled stages in the pack's look — the formality ban is a look constraint, not a refusal of the word.

Read the full file on GitHub · 720 lines

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.

  1. yesterday First seen · 720 lines · 169 tokens per session scan A 592503f91a15

Subscribe to this mod's changes

illo is a skill published in the GitHub repository tmchow/illo-skill (358 stars, last pushed 3d ago), licensed MIT. It adds 169 tokens to every session and 11,884 once invoked, about $0.0008 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 2026-08-30.

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