Domain knowledge about a Z anti-aliasing transform: a method for recovering a layer's surface from outlines on either side of it, including how regions are reshaped and how gaps are measured.

It helps reason about which regions to change, how to measure a stretch across a gap, and which mistakes to avoid.

The description gives specialized guidance for handling this transform and its edge cases when working from G-code, the machine instructions used by 3D printers.

How erkexzcx/corbel configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to erkexzcx/corbel. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/erkexzcx/corbel/main/.github/skills/zaa/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/erkexzcx/corbel

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/erkexzcx/corbel/zaa/github.svg)](https://agentmods.dev/skills/erkexzcx/corbel/zaa)

Your own site

<a href="https://agentmods.dev/skills/erkexzcx/corbel/zaa"><img src="https://agentmods.dev/badge/skills/erkexzcx/corbel/zaa/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/erkexzcx/corbel/zaa"><img src="https://agentmods.dev/badge/skills/erkexzcx/corbel/zaa.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 160 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 12,239 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.

Origin unknown 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	$0.00160	$0.12239
Opus 5.5	$0.00064	$0.04896
Sonnet 5.5	$0.00032	$0.02448
Haiku 4.5	$0.00016	$0.01224

Measured today against content hash dc610713bc85, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

zaa 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 today.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/audit.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.

.github/skills/zaa/SKILL.md · 349 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

1 file 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.

scripts/audit.py 12 KB runs code

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.

today First seen · 349 lines · 160 tokens per session scan A dc610713bc85

Subscribe to this mod's changes

zaa is a skill published in the GitHub repository erkexzcx/corbel (7 stars, last pushed 12d ago), licensed GPL-3.0. It adds 160 tokens to every session and 12,239 once invoked, about $0.0006 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 2026-11-07.

3d-printing Scientific bricklayer zaa

zaa next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
zaaerkexzcx/corbel	Skill	7	12d ago	GPL-3.0	A	160	Claude Code, Codex
ivy-inventorautonomous-ai/autonomous-workshop	Skill	24	today	Apache-2.0	A	26	Claude Code, Codex
image-to-mesh-cad-workflowEd3Design/ed3design-engineering-bundles	Skill	2	3mo ago	MIT	A	222	Claude Code
instrument-data-to-allotropeanthropics/knowledge-work-plugins	Skill	35k	today	Apache-2.0	A	123	Claude Code
exploratory-data-analysisK-Dense-AI/scientific-agent-skills	Skill	56k	5d ago	MIT	A	83	Claude Code
matlabK-Dense-AI/scientific-agent-skills	Skill	56k	5d ago	MIT	A	44	Claude Code
phylogeneticsK-Dense-AI/scientific-agent-skills	Skill	56k	5d ago	MIT	A	71	Claude Code, Codex

corbel: Skill for Claude Code