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.
npx agentmods add skills/deeplink-org/probing/persistent_stragglernpx skills add DeepLink-org/probing --skill persistent_stragglergit clone --depth 1 https://github.com/DeepLink-org/probingWrote 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.
[](https://agentmods.dev/skills/deeplink-org/probing/persistent_straggler)<a href="https://agentmods.dev/skills/deeplink-org/probing/persistent_straggler"><img src="https://agentmods.dev/badge/skills/deeplink-org/probing/persistent_straggler.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00022 | $0.00426 |
| Opus 5 | $0.00011 | $0.00213 |
| Sonnet 5 | $0.00004 | $0.00085 |
| Haiku 4.5 | $0.00002 | $0.00043 |
Grade A, and why
persistent_straggler 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 4d 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.
What it actually says
Persistent straggler (worst_fraction)
slow_rank 看 当前窗口里谁平均最慢；本 skill 看 谁在多少 step 上拿「最慢 rank」。
worst_fraction
对每个 rank 统计：在窗口内有多少 step 上，该 rank 的 collective 总耗时等于该 step 的最大值。
worst_fraction ≈ 1.0— 几乎每步都是最慢（ chronic straggler）worst_fraction ≈ 0.05— 偶发
Parameters
step_window(default300)worst_fraction_threshold(default0.25) —persistent_offenders步骤的过滤阈值use_global(defaulttrue)
用法
probing -t rank0:8080 skill run persistent_straggler --global
probing -t rank0:8080 skill run persistent_straggler --set worst_fraction_threshold=0.4 --set step_window=500
Related skills
- Job 整体变慢 →
job_health - 当前 step lag →
slow_rank - NCCL culprit/victim →
nccl_culprit_victim
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.
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.
- 4d ago First seen · 46 lines · 22 tokens per session scan A 3e8d791714d8
persistent_straggler is a skill published in the GitHub repository DeepLink-org/probing (11 stars, last pushed 5d ago), licensed Apache-2.0. It adds 22 tokens to every session and 426 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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