slow_rank

slow_rank is a skill for Claude Code, Codex from DeepLink-org/probing. It costs 13 tokens per session (329 once invoked), scanned A, original, Apache-2.0.

A distributed-training diagnostic that compares communication times across ranks, the parallel processes that share work, to find unusually slow ones.

In plain words
What is it for?
Use it to inspect recent training steps, find a straggling rank, and decide whether to investigate its GPU, network, or input data.
Why use it?
It helps identify when one process or machine is delaying collective operations that all processes must complete.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to inspect recent training steps, find a straggling rank, and decide whether to investigate its GPU, network, or input data.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/deeplink-org/probing/slow_rank
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 DeepLink-org/probing --skill slow_rank
Clone the repo
git clone --depth 1 https://github.com/DeepLink-org/probing

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 slow_rank

README.md
[![agentmods](https://agentmods.dev/badge/skills/deeplink-org/probing/slow_rank.svg)](https://agentmods.dev/skills/deeplink-org/probing/slow_rank)
Your own site
<a href="https://agentmods.dev/skills/deeplink-org/probing/slow_rank"><img src="https://agentmods.dev/badge/skills/deeplink-org/probing/slow_rank.svg" alt="Measured on agentmods" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 329 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.
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 $0.00013 $0.00329
Opus 5 $0.00006 $0.00164
Sonnet 5 $0.00003 $0.00066
Haiku 4.5 $0.00001 $0.00033

Measured 8d ago against content hash eb9e438b1a5f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

slow_rank 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 8d ago.

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.

python/probing/bundled_skills/slow_rank/SKILL.md · 32 lines

What it actually says

Find slow rank (straggler)

对比各 rank 的 collective 延迟,找出明显偏慢的 straggler。 单机多卡时 rank 列来自 torch.distributed;多机时使用 global.* 并带 _host/_rank 标签。

Parameters

  • step_window (integer, default 20): Include collectives from the last N global_steps
  • use_global (boolean, default True): Query global.python.comm_collective for cross-node fan-out
  • 某 rank 持续最慢 → 检查该节点 GPU/网络/数据: skill: gpu_pressure
  • 栈卡在 collective → skill: training_hang
  • 模块级热点 → skill: module_bottleneck (在慢 rank 上 inject)
  • 有 NCCL profiler → skill: nccl_culprit_victim
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. 8d ago First seen · 32 lines · 13 tokens per session scan A eb9e438b1a5f

Subscribe to this mod's changes

slow_rank is a skill published in the GitHub repository DeepLink-org/probing (11 stars, last pushed 2d ago), licensed Apache-2.0. It adds 13 tokens to every session and 329 once invoked, about $0.0001 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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