What is shader-skill?

A specification for writing shader bundles for the y5 compositor. A shader is a small program that calculates how pixels or visual effects are rendered, while a compositor combines those effects into an image.

Use it to turn a natural-language visual-effect request into a y5 shader bundle. The package includes a client, service schema, and working examples.

It documents the required format and implementation details so an agent can create bundles that the compositor can use. It also records known traps and limitations.

shader-skill — Skill for Claude Code and Codex by y5-snowies

Install

Getting it into your agent

There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.

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/y5-snowies/nourish/shader-skill/github.svg)](https://agentmods.dev/skills/y5-snowies/nourish/shader-skill)

Your own site

<a href="https://agentmods.dev/skills/y5-snowies/nourish/shader-skill"><img src="https://agentmods.dev/badge/skills/y5-snowies/nourish/shader-skill/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/y5-snowies/nourish/shader-skill"><img src="https://agentmods.dev/badge/skills/y5-snowies/nourish/shader-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 18,530 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 1 finding. A grade says what 26 rules found in the file — not that it is safe.

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	$0.00000	$0.18530
Opus 5	$0.00000	$0.09265
Sonnet 5	$0.00000	$0.03706
Haiku 4.5	$0.00000	$0.01853

Measured 11d ago against content hash f6bcd50da086, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade C, and why

shader-skill scanned grade C with 1 finding 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 11d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (examples/make-texture-assets.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.

Tells the agent never to refusehighAnti-refusal

Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.

does not run into one of these, **it is buildable** — work out the function, do not decline.

document/shader-skill/SKILL.md · 1,383 lines

How it starts

The opening of the file, as written. The whole thing — 1,383 lines — stays where its author put it; the contents beside it link to each section on GitHub.

y5 background shader — skill

Audience: an agent writing a shader bundle for the y5 compositor from a natural-language request. This document is the specification. It is exhaustive: everything you need to emit a correct bundle is here. The example bundles listed at the end are for calibration — read one when you want to see a shape in practice, not to discover what exists.

This folder is self-contained. Everything it refers to is inside it, and every path below is relative to this file:

SKILL.md          this document
y5-shader-x86     a prebuilt client for the compositor's gRPC service
shader.proto      the service schema, for any other gRPC client
examples/         every bundle referenced below

Resolve the paths against wherever you loaded the skill from. Nothing here reaches outside the folder, so it can be copied anywhere and still work.

Every fact here is checked against the implementation. Where something is parsed but does not work, it says so — those are the traps that cost the most time.

0. Before you write anything

Read first, then build

You are being asked for an effect, and this document is long. Read the sections the request actually needs before emitting a single line — a bundle that has to be corrected three times is slower and more visible to the person waiting than two minutes of reading.

Always read §1 (which form) and §3 (the push block). Then, by what the request involves:

The request mentions	Read	Open
just a background, wallpaper, pattern	§1.1, §10	`examples/aurora`
the desktop, "everything", a whole-screen look	§5, §5.1	`examples/mp-grayscale`
windows — glow, outline, per-window treatment	§5, §6.1	`examples/tb-window-frost`
seeing behind a window: transparency, refraction	§7	`examples/tb-window-chroma`
focus, dragging, resizing, "the active window"	§6.2, §6.3	`examples/tb-window-descriptors`
the cursor	§6.4	`examples/tb-storage-embers`
several stages, blur, bloom, pyramids	§2, §11	`examples/tb-chain-bleed`
trails, decay, "leaves a mark", feedback	§9.1	`examples/tb-persist-trail`
particles, counters, anything accumulating	§9.2	`examples/tb-storage-embers`
barrel/lens/CRT distortion, anything that bends the picture	§8	`examples/mp-crt`

Read the full file on GitHub · 1,383 lines

Files

What ships with it

60 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.

11d ago First seen · 1,383 lines · 0 tokens per session scan C f6bcd50da086

Subscribe to this mod's changes

shader-skill is a skill published in the GitHub repository y5-snowies/nourish (228 stars, last pushed 7d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 18,530 tokens. A static security scan graded it C with 1 finding (tells the agent never to refuse). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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