Coreweave Fabric Diagnostics

Q: What is a Claude Code skill and how does the Coreweave Fabric Diagnostics skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Coreweave Fabric Diagnostics is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-07-15

type:debug

Diagnose the most expensive silent failure on a CoreWeave multi-node GPU job: GPUDirect RDMA falling back from InfiniBand to TCP. When NCCL drops from NET/IB to NET/Socket, collectives keep running with NO error but throughput collapses (commonly 5-20x slower) while every GPU still bills at full rate — 5x the GPU bill for the same work, invisibly. Paste an NCCL_DEBUG=INFO log (and/or a pod-spec, ibstat, or all_reduce_perf output) and the bundled deterministic script verdicts whether RDMA is actually engaged, which of the three required conditions is missing, and the fix. Use when multi-node training is slow, when checking whether RDMA/InfiniBand is engaged, or when all-reduce bandwidth looks low. Trigger with "coreweave slow training", "is RDMA working", "NCCL fell back to TCP", "NET/Socket", "GPUDirect RDMA", "infiniband not used", "multi-node training slow".

Security AStatic scan found no risk patternsHow grading works ›

About this skill (catalog notes)

Coreweave Fabric Diagnostics includes a dedicated installation section; worked examples; pricing or quota commentary. At roughly 1,784 words the SKILL.md is on the longer end of the catalog distribution.

Source: tonsofskills.com
License: MIT
Original author: Jeremy Longshore <[email protected]>
Indexed lastmod: 2026-07-15
Catalog position: General · general-misc
Indexed related skills: 10

How Coreweave Fabric Diagnostics fits the catalog

Coreweave Fabric Diagnostics sits in the General category under the general-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

Is Coreweave Fabric Diagnostics safe to install?

A free static scan against the OWASP Agentic Skills Top 10 found no risk patterns in Coreweave Fabric Diagnostics’s SKILL.md — no data-exfiltration, prompt-injection, or unexpected-execution signatures. The full security scan is below.

Installing & verifying

Installing Coreweave Fabric Diagnostics writes its SKILL.md to ~/.claude/skills/coreweave-fabric-diagnostics/SKILL.md; Claude Code discovers it automatically on the next session — no restart flag needed. It declares no allowed-tools restriction, so it inherits your session’s existing tool access rather than narrowing it. To confirm it loaded, ask Claude to list its available skills — coreweave-fabric-diagnostics should appear by name.

What Coreweave Fabric Diagnostics needs to run

External services: The SKILL.md references pricing, quota, or rate limits — it likely calls a paid or rate-limited API. Check the source before wiring it into unattended automation.
Prerequisites: Ships its own installation / prerequisites section — it isn’t purely self-contained; read that first.
Worked code: 4 copy-paste code blocks in the body.
Depth: ~1,784 words, substantial — top of the catalog distribution.

When to reach for it

There are 10 related skills in General — a two-minute scan of the alternatives usually confirms whether Coreweave Fabric Diagnostics is the right pick.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Detects when a CoreWeave multi-node GPU job has silently fallen off the InfiniBand fabric onto TCP — the failure that makes distributed training run at a fraction of the hardware's speed while every GPU keeps billing at the full rate — and gives the exact fix.

What this skill does

Coreweave Fabric Diagnostics is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/coreweave-fabric-diagnostics/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when multi-node training is slow, when checking whether RDMA/InfiniBand is engaged, or when all-reduce bandwidth looks low. Trigger with "coreweave slow training", "is RDMA working", "NCCL fell back to TCP", "NET/Socket", "GPUDirect RDMA", "infiniband not used", "multi-node training slow".

Who uses this skill

The Coreweave Fabric Diagnostics Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 184,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/coreweave-fabric-diagnostics
curl -L https://claudskills.com/skills/coreweave-fabric-diagnostics/SKILL.md \
  -o ~/.claude/skills/coreweave-fabric-diagnostics/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/coreweave-fabric-diagnostics/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/coreweave-fabric-diagnostics/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\coreweave-fabric-diagnostics\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Coreweave Fabric Diagnostics Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/coreweave-fabric-diagnostics/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Coreweave Fabric Diagnostics skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Coreweave Fabric Diagnostics skill?

Use Coreweave Fabric Diagnostics when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Coreweave Fabric Diagnostics" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Coreweave Fabric Diagnostics skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Coreweave Fabric Diagnostics is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/HEAD/plugins/saas-packs/coreweave-pack/skills/coreweave-fabric-diagnostics/SKILL.md
License: MIT
Author: Jeremy Longshore <[email protected]>
Website: https://tonsofskills.com

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

Jeremy Longshore <[email protected]>. (2026). Coreweave Fabric Diagnostics [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/coreweave-fabric-diagnostics/

BibTeX

@misc{coreweave-fabric-diagnostics-2026,
  author    = {Jeremy Longshore <[email protected]>},
  title     = {Coreweave Fabric Diagnostics [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/coreweave-fabric-diagnostics/}
}

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Security scan

Grade A · scanned 2026-08-13 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/coreweave-fabric-diagnostics/#security)

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