Individual skill
coreweave-fabric-diagnostics
Diagnose CoreWeave NCCL transport and RDMA configuration from supplied logs, Pod resources and ibstat output. Use when multi-node training is slow, NET/Socket appears, or checking whether InfiniBand and GPU Direct RDMA are engaged. Trigger with "coreweave slow training", "is RDMA working", "NCCL fell back to TCP", "GPUDirect RDMA", or "infiniband not used".
plugins/saas-packs/coreweave-pack/skills/coreweave-fabric-diagnostics/SKILL.md
Source commit 0500b275e963c027f6b410e8c49c0446945c574e
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Not checked yet
- Last checked
- Nov 12, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 2,916
- Repository last updated
- Nov 12, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- ai Repository topic
- automation Repository topic
- claude-code Repository topic
- devops Repository topic
- mcp Repository topic
- ai-agents Repository topic
- anthropic Repository topic
- claude-code-plugins Repository topic
- developer-tools Repository topic
- llm Repository topic
- saas Declared skill tag
- coreweave Declared skill tag
- gpu-cloud Declared skill tag
- rdma Declared skill tag
- nccl Declared skill tag
- engineering Derived category
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ARD.mddoc · 2,164 bytesPRD.mddoc · 2,102 bytesSKILL.mdcore · 5,124 bytesSKILL.mdcore · 5,124 bytesSKILL.mdcore · 5,124 bytesSKILL.mdcore · 5,124 bytesSKILL.mdcore · 5,124 bytesdocs/BLUEPRINT.mddoc · 8,860 byteseval-spec.yamlasset · 6,036 bytesreferences/allreduce-baseline.mddoc · 655 bytesreferences/nccl-debug-reading.mddoc · 785 bytesreferences/rdma-engagement-checklist.mddoc · 776 bytesscripts/fabric-check.pyruns · 8,792 bytesscripts/requirements.txtdoc · 14 bytes
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# CoreWeave Fabric Diagnostics
> **Community-contributed.** Not affiliated with, endorsed by, or sponsored by CoreWeave, Inc. CoreWeave is a registered trademark of CoreWeave, Inc.
## Overview
Review positive NCCL transport evidence without guessing a slowdown or billing impact.
The offline script distinguishes an InfiniBand transport selection from positive GPU Direct RDMA evidence.
A warning mentioning NET/IB, a bootstrap socket or an isolated bandwidth figure cannot establish a healthy data path.
Use Read for supplied diagnostics, Glob for owner-selected rank logs, Write the report and Edit the proposed local correction; do not mutate the cluster.
## Prerequisites
- Sanitized NCCL_DEBUG=INFO output from one known run, with rank/time identity preserved.
- Optional admitted Pod resource blocks and ibstat output from the same scope; Pod YAML may contain secrets and must be reviewed before sharing.