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Agent skill

Libpng Iccp QA

by InternationalColorConsortium in InternationalColorConsortium/iccDEV

Reproduce and test pinned libpng iCCP stream-completion, Adler-32, trailing-output, and PNG CRC-policy faults with durable ICC fixtures.

BSD-3-ClauseAuto-check passedDevelopment

Install Libpng Iccp QA

skills CLI
$ npx skills add InternationalColorConsortium/iccDEV --skill libpng-iccp-qa -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install InternationalColorConsortium/iccDEV libpng-iccp-qa --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/InternationalColorConsortium/iccDEV.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/libpng-iccp-qa .claude/skills/libpng-iccp-qa && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
libpng-iccp-qa
GitHub stars
183
Token cost
~452 tokens
SKILL.md length
218 words
Files
1
Skills in repo
23
Repo updated
First seen
Licence
BSD-3-Clause

At a glance

Reproduce and test pinned libpng iCCP stream-completion, Adler-32, trailing-output, and PNG CRC-policy faults with durable ICC fixtures.

  • Works in 8 steps: Keep libpng clones, build trees,… → Read… → Configure… → …
  • Development work in your project
  • Calls git

What it does

Libpng Iccp QA is an agent skill from InternationalColorConsortium/iccDEV. Reproduce and test pinned libpng iCCP stream-completion, Adler-32, trailing-output, and PNG CRC-policy faults with durable ICC fixtures.

Its SKILL.md is about 450 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: iccDEV provides a set of libraries and tools that allow for the interaction, manipulation, and application of ICC color management profiles. The licence is BSD-3-Clause.

When your agent uses it

  • Development work in your project

Example prompts

  • “/libpng-iccp-qa”

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

  1. Keep libpng clones, build trees, generated PNG carriers, and logs outside
  2. Read .github/ci/tooling/libpng/Readme.md. Use the exact pinned tag and
  3. Configure .github/ci/tooling/libpng/qa/CMakeLists.txt with ASan+UBSan and
  4. Before patching, run libpng_iccp_qa.py --mode vulnerable and require all
  5. Run git apply --check, apply every patch in lexical order, rebuild, and
  6. Run that focused CTest with --output-on-failure --no-tests=error. Require
  7. Treat missing fixtures, hash drift, sanitizer diagnostics, signals, new
  8. Report iccDEV and libpng revisions, patch hash, compiler and sanitizer

What it can do on your machine

Read from SKILL.md and the folder at commit 3c2425d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Libpng Iccp QA loads about 452 tokens when it runs. Until then it costs about 38 tokens; SKILL.md has 218 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~38
When it runs · the whole SKILL.md, loaded when a task matches
~452

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from InternationalColorConsortium/iccDEV at commit 3c2425d, republished under its BSD-3-Clause licence (© InternationalColorConsortium). 218 words, ~452 tokens.

Download SKILL.mdSave it as .claude/skills/libpng-iccp-qa/SKILL.md (or your agent's skills folder).
name
libpng-iccp-qa
description
Reproduce and test pinned libpng iCCP stream-completion, Adler-32, trailing-output, and PNG CRC-policy faults with durable ICC fixtures.

libpng iCCP Fault QA

Use this skill for libpng iCCP fault reproduction, the tracked libpng candidate patch, or .github/workflows/ci-libpng-iccp-smoke.yml.

Workflow

  1. Keep libpng clones, build trees, generated PNG carriers, and logs outside the iccDEV worktree.
  2. Read .github/ci/tooling/libpng/Readme.md. Use the exact pinned tag and revision; do not substitute the system libpng.
  3. Configure .github/ci/tooling/libpng/qa/CMakeLists.txt with ASan+UBSan and build the pngtest target.
  4. Before patching, run libpng_iccp_qa.py --mode vulnerable and require all four invalid profiles to survive. This is the negative proof.
  5. Run git apply --check, apply every patch in lexical order, rebuild, and use ctest -N --no-tests=error to verify iccdev.libpng-iccp-qa exists.
  6. Run that focused CTest with --output-on-failure --no-tests=error. Require invalid profiles to be absent, the valid control to match byte-for-byte, and the explicit relaxed bad-CRC policy to retain the profile.
  7. Treat missing fixtures, hash drift, sanitizer diagnostics, signals, new compiler warnings, patch drift, or a missing CTest as failures.
  8. Report iccDEV and libpng revisions, patch hash, compiler and sanitizer envelope, the before/after matrix, fixture hash, and all local changes.

Use the manually dispatched workflow for hosted validation. Do not add this external dependency build to general iccDEV pull-request or tool-test jobs. Upstream issue assignment is pending; do not conflate this fault with PAWG profile parsing or claim that pnggroup/libpng #211 covers the full contract.

© InternationalColorConsortium, BSD-3-Clause. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .github/skills/libpng-iccp-qa of InternationalColorConsortium/iccDEV.

Open the folder on GitHubat commit 3c2425d

Compare with similar skills

Libpng Iccp QA next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Libpng Iccp QA compared with similar skills
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Libpng Iccp QA this skillInternationalColorConsortium/iccDEV183—~452Automated safety check: PassBSD-3-Clause
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PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Libpng Iccp QA

What does Libpng Iccp QA do?

Reproduce and test pinned libpng iCCP stream-completion, Adler-32, trailing-output, and PNG CRC-policy faults with durable ICC fixtures. Libpng Iccp QA is an agent skill from InternationalColorConsortium/iccDEV. Reproduce and test pinned libpng iCCP stream-completion, Adler-32, trailing-output, and PNG CRC-policy faults with durable ICC fixtures.

When should I use Libpng Iccp QA?

Libpng Iccp QA fits situations like: development work in your project.

How do I install Libpng Iccp QA in Claude Code?

Run `npx skills add InternationalColorConsortium/iccDEV --skill libpng-iccp-qa -a claude-code`. Or copy the skill folder (.github/skills/libpng-iccp-qa in InternationalColorConsortium/iccDEV) into .claude/skills/libpng-iccp-qa in your project. Claude Code loads it when a task matches its description.

How do I install Libpng Iccp QA in Codex?

Run `npx skills add InternationalColorConsortium/iccDEV --skill libpng-iccp-qa -a codex`. Or copy the skill folder (.github/skills/libpng-iccp-qa in InternationalColorConsortium/iccDEV) into .agents/skills/libpng-iccp-qa in your project. Codex loads it when a task matches its description.

Can I use Libpng Iccp QA in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add InternationalColorConsortium/iccDEV --skill libpng-iccp-qa -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/libpng-iccp-qa, .gemini/skills/libpng-iccp-qa, .github/skills/libpng-iccp-qa and .opencode/skills/libpng-iccp-qa in your project.

What does Libpng Iccp QA need to run?

Going by SKILL.md and its folder, Libpng Iccp QA needs the command-line tools its instructions call (git).

Does Libpng Iccp QA access the network?

SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Libpng Iccp QA safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Libpng Iccp QA use?

Libpng Iccp QA is published under the BSD-3-Clause licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Libpng Iccp QA use?

About 452 tokens (SKILL.md is roughly 1.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Libpng Iccp QA?

Skills that share tags, products or a category with Libpng Iccp QA: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Libpng Iccp QA?

InternationalColorConsortium (a GitHub organization) maintains it in InternationalColorConsortium/iccDEV, which has 183 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 9, 2026.

Source: InternationalColorConsortium/iccDEV on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.