dask

A Python library for processing pandas and NumPy workloads in parallel, including data that does not fit in a computer's memory. It can run work across multiple cores or machines.

In plain words
What is it for?
Use it for parallel file processing, larger-than-memory analysis, distributed machine learning, and pandas-based workflows running on clusters.
Why use it?
It helps scale existing data-processing code when files are too large for RAM, take too long on one machine, or need to run across a cluster.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/lzy599775/agent-auto-sci-skills/dask
Any agent
npx skills add Lzy599775/agent-auto-sci-skills --skill dask
Clone the repo
git clone --depth 1 https://github.com/Lzy599775/agent-auto-sci-skills

Made for: Claude Code, Codex.

Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,614 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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 $0.00069 $0.03614
Opus 5 $0.00034 $0.01807
Sonnet 5 $0.00014 $0.00723
Haiku 4.5 $0.00007 $0.00361

Measured yesterday against content hash bfac81cda498, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dask 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 yesterday.

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.

Origin

This is a copy

100% identical to dask — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/kdense-data-viz-selected/subskills/k-dense/dask/SKILL.md · 483 lines

How it starts

The opening of the file, as written. The whole thing — 483 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Dask

Overview

Dask is a Python library for parallel and distributed computing that enables three critical capabilities:

  • Larger-than-memory execution on single machines for data exceeding available RAM
  • Parallel processing for improved computational speed across multiple cores
  • Distributed computation supporting terabyte-scale datasets across multiple machines

Dask scales from laptops (processing ~100 GiB) to clusters (processing ~100 TiB) while maintaining familiar Python APIs.

Current upstream: dask 2026.3.0 (PyPI, March 2026). Docs: docs.dask.org. Since 2025.1.0, the expression-based DataFrame API with query planning is the only implementation — do not install dask-expr separately or set dataframe.query-planning: False.

Quick Start

Installation

uv pip install "dask>=2025.1"

For a typical pandas/NumPy workflow with the distributed scheduler and dashboard:

uv pip install "dask[complete]"

Remote object storage (S3, GCS, Azure):

uv pip install s3fs    # s3:// paths
uv pip install gcsfs   # gs:// paths

Requires Python 3.10+ (3.9 support dropped in 2024.12). DataFrame I/O requires PyArrow 16+ (as of dask 2026.1.2).

When to Use This Skill

This skill should be used when:

  • Process datasets that exceed available RAM
  • Scale pandas or NumPy operations to larger datasets
  • Parallelize computations for performance improvements
  • Process multiple files efficiently (CSVs, Parquet, JSON, text logs)
  • Build custom parallel workflows with task dependencies
  • Distribute workloads across multiple cores or machines

Core Capabilities

Dask provides five main components, each suited to different use cases:

1. DataFrames - Parallel Pandas Operations

Purpose: Scale pandas operations to larger datasets through parallel processing.

When to Use:

  • Tabular data exceeds available RAM
  • Need to process multiple CSV/Parquet files together
  • Pandas operations are slow and need parallelization
  • Scaling from pandas prototype to production

Read the full file on GitHub · 483 lines

Files

What ships with it

6 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.

  1. yesterday First seen · 483 lines · 69 tokens per session scan A bfac81cda498

Subscribe to this mod's changes

dask is a skill published in the GitHub repository Lzy599775/agent-auto-sci-skills (2 stars, last pushed 7d ago), licensed MIT. It adds 69 tokens to every session and 3,614 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to dask, differing in 0 lines, and is treated as a copy.

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