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Agent skill

Avx2 Clut Diagnostics

by InternationalColorConsortium in InternationalColorConsortium/iccDEV

Diagnose runtime-dispatched AVX2 3D CLUT interpolation, collect trace evidence, validate vector and masked-tail output, and prepare optimization handoff data.

BSD-3-ClauseAuto-check passedDevelopment

Install Avx2 Clut Diagnostics

skills CLI
$ npx skills add InternationalColorConsortium/iccDEV --skill avx2-clut-diagnostics -a claude-code

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

GitHub CLI
$ gh skill install InternationalColorConsortium/iccDEV avx2-clut-diagnostics --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/avx2-clut-diagnostics .claude/skills/avx2-clut-diagnostics && 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
avx2-clut-diagnostics
GitHub stars
183
Token cost
~850 tokens
SKILL.md length
282 words
Files
1
Skills in repo
23
Repo updated
First seen
Licence
BSD-3-Clause

At a glance

Diagnose runtime-dispatched AVX2 3D CLUT interpolation, collect trace evidence, validate vector and masked-tail output, and prepare optimization handoff data.

  • Works in 4 steps: Build the Diagnostic Configuration → Inspect the Dispatch → Validate Behavior → …
  • Development work in your project
  • SKILL.md covers 1. Build the Diagnostic…, 2. Inspect the Dispatch, 3. Validate Behavior and 4. Measure Separately, plus 2 more sections
  • Calls cmake

What it does

Avx2 Clut Diagnostics is an agent skill from InternationalColorConsortium/iccDEV. Diagnose runtime-dispatched AVX2 3D CLUT interpolation, collect trace evidence, validate vector and masked-tail output, and prepare optimization handoff data.

Its SKILL.md is about 850 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

  • “/avx2-clut-diagnostics”

Requirements

  • Pre-approved tools (allowed-tools): bash, read, grep, glob, shell(git:*)

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Build the Diagnostic Configuration
  2. Inspect the Dispatch
  3. Validate Behavior
  4. Measure Separately

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 these tools, so the agent can use them without asking each time:

    • bash
    • read
    • grep
    • glob
    • shell(git:*)

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • cmake

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

  • Network

    No URLs in SKILL.md.

    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

Avx2 Clut Diagnostics loads about 850 tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 282 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~45
When it runs · the whole SKILL.md, loaded when a task matches
~850

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). 282 words, ~850 tokens.

Download SKILL.mdSave it as .claude/skills/avx2-clut-diagnostics/SKILL.md (or your agent's skills folder).
name
avx2-clut-diagnostics
description
Diagnose runtime-dispatched AVX2 3D CLUT interpolation, collect trace evidence, validate vector and masked-tail output, and prepare optimization handoff data.
allowed-tools
bash, read, grep, glob, shell(git:*)

AVX2 CLUT Diagnostics

Use this skill for source-level AVX2 CLUT debugging and performance handoff. Do not use diagnostic traces as throughput benchmarks.

1. Build the Diagnostic Configuration

On Windows:

cmd
cmake --preset vs2022-clangcl-x64-avx2-diagnostics -S Build/Cmake -B out/vs2022-clangcl-x64-avx2-diagnostics
cmake --build out/vs2022-clangcl-x64-avx2-diagnostics --config Debug -- /m /maxcpucount

On Linux, configure with -DICCDEV_ENABLE_AVX2=ON and -DICC_AVX2_CLUT_DEBUG=ON.

The default ci-regression-checks build does not enable ICCDEV_ENABLE_AVX2; it validates the portable fallback rather than the AVX2 kernel. The Windows PR ClangCL lane enables AVX2, but use this explicit diagnostic configuration when trace evidence is required.

2. Inspect the Dispatch

Set breakpoints in IccTraceAvx2ClutDispatch() and IccTraceAvx2ClutKernel() in IccProfLib/IccSignatureUtils.h. Confirm AVX2 is selected only with CPU support and the measured winning output count: 15. Record offsets, weights, vector outputs, masked outputs, and elapsed time.

3. Validate Behavior

cmd
ctest --test-dir out/vs2022-clangcl-x64-avx2-diagnostics -C Debug --output-on-failure --no-tests=error -R "^iccdev\.clut-eight-output-regression$"

The eight-, nine-, eleven-, and fourteen-output fixtures pin SSE2 fallback behavior. The fifteen-output fixture exercises a full AVX2 vector plus a seven-output masked tail.

4. Measure Separately

Reconfigure with ICC_AVX2_CLUT_DEBUG=OFF before measuring. Preserve CPUID, XGETBV, scalar/SSE fallback behavior, and bit-exact per-lane regression output.

Use the interleaved native benchmark for the performance decision:

powershell
.github\scripts\iccdev-windows-clut-avx2-benchmark.ps1 `
  -BaselineBuildDir C:\path\to\baseline-build `
  -Avx2BuildDir C:\path\to\avx2-build `
  -Iterations 20000000 -Repetitions 11

Measure output counts 8 through 16. Windows AVX2 measurements use ClangCL; native MSVC remains on SSE2 because its AVX2 implementation regressed. Require output_vector_match=True for every result row.

On Linux, make a separate Release monitoring build with -DICCDEV_ENABLE_PERF_MONITORING=ON. Then collect a pinned timing distribution, hardware counters, syscall summary, and optional FlameGraph inputs:

bash
ICCDEV_CLUT_PROFILE_AFFINITY=0 \
ICCDEV_CLUT_PROFILE_RUNS=21 \
ICCDEV_CLUT_PROFILE_FLAMEGRAPH=1 \
ICCDEV_FLAMEGRAPH_DIR=/path/to/FlameGraph \
./.github/scripts/iccdev-clut-profile.sh out/clut-avx2 out/clut-profile

Inside the unified container, use its preconfigured pinned ICCDEV_FLAMEGRAPH_DIR without overriding it.

The script preserves a telemetry file per measured CTest run. Do not enable ICC_AVX2_CLUT_DEBUG, coverage, or strace while comparing cycle counts.

Handoff

Provide the branch and commit, target CPU, compiler, diagnostic trace summary, debug and release validation results, measurement command, p50/p95 timing, telemetry, perf, syscall, and FlameGraph artifacts, and any pending Windows-specific investigation.

Reference

../../../docs/avx2-clut-diagnostics.md

© 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/avx2-clut-diagnostics of InternationalColorConsortium/iccDEV.

Open the folder on GitHubat commit 3c2425d

Compare with similar skills

Avx2 Clut Diagnostics 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.

Avx2 Clut Diagnostics compared with similar skills
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Avx2 Clut Diagnostics this skillInternationalColorConsortium/iccDEV183—~850Automated 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 Avx2 Clut Diagnostics

What does Avx2 Clut Diagnostics do?

Diagnose runtime-dispatched AVX2 3D CLUT interpolation, collect trace evidence, validate vector and masked-tail output, and prepare optimization handoff data. Avx2 Clut Diagnostics is an agent skill from InternationalColorConsortium/iccDEV. Diagnose runtime-dispatched AVX2 3D CLUT interpolation, collect trace evidence, validate vector and masked-tail output, and prepare optimization handoff data.

When should I use Avx2 Clut Diagnostics?

Avx2 Clut Diagnostics fits situations like: development work in your project.

How do I install Avx2 Clut Diagnostics in Claude Code?

Run `npx skills add InternationalColorConsortium/iccDEV --skill avx2-clut-diagnostics -a claude-code`. Or copy the skill folder (.github/skills/avx2-clut-diagnostics in InternationalColorConsortium/iccDEV) into .claude/skills/avx2-clut-diagnostics in your project. Claude Code loads it when a task matches its description.

How do I install Avx2 Clut Diagnostics in Codex?

Run `npx skills add InternationalColorConsortium/iccDEV --skill avx2-clut-diagnostics -a codex`. Or copy the skill folder (.github/skills/avx2-clut-diagnostics in InternationalColorConsortium/iccDEV) into .agents/skills/avx2-clut-diagnostics in your project. Codex loads it when a task matches its description.

Can I use Avx2 Clut Diagnostics 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 avx2-clut-diagnostics -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/avx2-clut-diagnostics, .gemini/skills/avx2-clut-diagnostics, .github/skills/avx2-clut-diagnostics and .opencode/skills/avx2-clut-diagnostics in your project.

What does Avx2 Clut Diagnostics need to run?

Going by SKILL.md and its folder, Avx2 Clut Diagnostics needs the command-line tools its instructions call (cmake). Its frontmatter pre-approves these tools: bash, read, grep, glob, shell(git:*).

Does Avx2 Clut Diagnostics access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Avx2 Clut Diagnostics 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 Avx2 Clut Diagnostics use?

Avx2 Clut Diagnostics 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 Avx2 Clut Diagnostics use?

About 850 tokens (SKILL.md is roughly 3.4k 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 Avx2 Clut Diagnostics?

Skills that share tags, products or a category with Avx2 Clut Diagnostics: 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 Avx2 Clut Diagnostics?

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.