asl-skill

asl-skill is a skill for Claude Code, Codex from CUHK-AIM-Group/NeuroClaw. It costs 122 tokens per session (2,097 once invoked), scanned A, original, MIT.

A workflow for processing Arterial Spin Labeling (ASL) perfusion MRI, a brain scan method used to estimate blood flow without injected contrast dye.

In plain words
What is it for?
Planning ASL preprocessing and cerebral-blood-flow analysis, including motion correction, partial-volume correction, and M0 normalization.
Why use it?
It organizes the required preparation and analysis steps while making sure the needed structural scan and processing tools are considered.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents.

Good fit Planning ASL preprocessing and cerebral-blood-flow analysis, including motion correction, partial-volume correction, and M0 normalization.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cuhk-aim-group/neuroclaw/asl-skill
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.

Any agent
npx skills add CUHK-AIM-Group/NeuroClaw --skill asl-skill
Clone the repo
git clone --depth 1 https://github.com/CUHK-AIM-Group/NeuroClaw

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.

agentmods badge for asl-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/cuhk-aim-group/neuroclaw/asl-skill/github.svg)](https://agentmods.dev/skills/cuhk-aim-group/neuroclaw/asl-skill)
Your own site
<a href="https://agentmods.dev/skills/cuhk-aim-group/neuroclaw/asl-skill"><img src="https://agentmods.dev/badge/skills/cuhk-aim-group/neuroclaw/asl-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.

agentmods 80×15 button for asl-skill

Your own site · 80×15
<a href="https://agentmods.dev/skills/cuhk-aim-group/neuroclaw/asl-skill"><img src="https://agentmods.dev/badge/skills/cuhk-aim-group/neuroclaw/asl-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 122 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,097 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium analysis-evasion · line 1
    Suspicious Unicode normalization or mixed-script content
    Fix: Review the flagged content for security risks. Ensure no credentials, secrets, or sensitive data are exposed.
How audits are shown
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 5.1 $0.00122 $0.02097
Opus 5 $0.00061 $0.01048
Sonnet 5 $0.00024 $0.00419
Haiku 4.5 $0.00012 $0.00210

Measured 11d ago against content hash d1ec8bd111fc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

asl-skill 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 11d ago.

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

skills/asl-skill/SKILL.md · 169 lines

How it starts

The opening of the file, as written. The whole thing — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ASL Skill (Modality Layer)

Overview

asl-skill is the NeuroClaw modality-layer interface skill responsible for all Arterial Spin Labeling (ASL) perfusion MRI data processing tasks.

It strictly follows the NeuroClaw hierarchical design principles:

  • This skill only describes WHAT needs to be done and which tool skill to delegate to.
  • It contains no implementation code or concrete commands.
  • All concrete execution is delegated to existing base/tool skills: fsl-tool, nibabel-skill, and claw-shell.
  • Companion scripts in scripts/ provide reference implementations for CBF quantification.

Core workflow (never bypassed):

  1. Identify input ASL data and labeling strategy (pCASL, CASL, or PASL).
  2. Ensure T1w structural data is available (via smri-skill if not yet processed).
  3. Generate a numbered execution plan clearly stating WHAT needs to be done and which tool skill will handle each step.
  4. Present the full plan, estimated runtime, resource requirements, and risks to the user and wait for explicit confirmation ("YES" / "execute" / "proceed").
  5. On confirmation, delegate every step to the appropriate skill via claw-shell.
  6. After execution, save all outputs in a clean directory structure (asl_output/).

Research use only.


Quick Reference (Common ASL Tasks)

Task What needs to be done Delegate to which tool skill Expected output
ASL preprocessing Motion correction, masking, registration to T1w fsl-tool (ASL_PREPCORE) Preprocessed ASL in T1w space
M0 normalization Divide ASL difference image by M0 reference image to get perfusion signal fsl-tool or scripts/compute_cbf.py Normalized perfusion map
CBF quantification Convert perfusion signal to absolute CBF (mL/100g/min) using Buxton model scripts/compute_cbf.py CBF map (NIfTI) + ROI summary (CSV)
Partial volume correction Correct CBF for gray/white matter partial volume effects fsl-tool + tissue segmentation PVC-corrected CBF map
ASL-to-MNI normalization Warp CBF map to MNI152 template for group analysis fsl-tool (FNIRT) or smri-skill CBF in MNI152 space
ROI-based CBF extraction Extract mean CBF from atlas-defined ROIs fsl-tool + atlas Per-region CBF values (CSV)
Quality control Check for outliers, low SNR, motion artifacts in ASL series scripts/compute_cbf.py (--qc) QC report

Read the full file on GitHub · 169 lines

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.

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. 11d ago First seen · 169 lines · 122 tokens per session scan A d1ec8bd111fc

Subscribe to this mod's changes

asl-skill is a skill published in the GitHub repository CUHK-AIM-Group/NeuroClaw (84 stars, last pushed 4d ago), licensed MIT. It adds 122 tokens to every session and 2,097 once invoked, about $0.0006 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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