fabric-notebook-perf-remediate

fabric-notebook-perf-remediate is a skill for Claude Code, Codex from PatrickGallucci/fabric-skills. It costs 110 tokens per session (2,032 once invoked), scanned A, original, MIT.

A troubleshooting guide for Microsoft Fabric notebooks running Apache Spark, a system for processing large datasets across multiple machines. It focuses on slow cells, failed jobs, resource limits, and inefficient data operations.

In plain words
What is it for?
Use it to investigate timeouts, HTTP 430 throttling, high capacity usage, data skew, shuffle costs, out-of-memory errors, slow session startup, and queued pipeline notebooks.
Why use it?
It helps trace notebook delays and failures to causes such as throttling, unevenly distributed data, expensive data shuffles, memory limits, or poorly optimized Delta Lake tables.

Skill for Claude CodeCodex

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

Good fit Use it to investigate timeouts, HTTP 430 throttling, high capacity usage, data skew, shuffle costs, out-of-memory errors, slow session startup, and queued pipeline notebooks.

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Install with agentmods
npx agentmods add skills/patrickgallucci/fabric-skills/fabric-notebook-perf-remediate
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 PatrickGallucci/fabric-skills --skill fabric-notebook-perf-remediate
Clone the repo
git clone --depth 1 https://github.com/PatrickGallucci/fabric-skills

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 fabric-notebook-perf-remediate

README.md
[![agentmods](https://agentmods.dev/badge/skills/patrickgallucci/fabric-skills/fabric-notebook-perf-remediate/github.svg)](https://agentmods.dev/skills/patrickgallucci/fabric-skills/fabric-notebook-perf-remediate)
Your own site
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for fabric-notebook-perf-remediate

Your own site · 80×15
<a href="https://agentmods.dev/skills/patrickgallucci/fabric-skills/fabric-notebook-perf-remediate"><img src="https://agentmods.dev/badge/skills/patrickgallucci/fabric-skills/fabric-notebook-perf-remediate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 110 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,032 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 $0.00110 $0.02032
Opus 5 $0.00055 $0.01016
Sonnet 5 $0.00022 $0.00406
Haiku 4.5 $0.00011 $0.00203

Measured 12d ago against content hash f395a7adf2d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

fabric-notebook-perf-remediate 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 12d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/notebook-health-check.py, templates/spark-config-template.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/fabric-notebook-perf-remediate/SKILL.md · 209 lines

How it starts

The opening of the file, as written. The whole thing — 209 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Microsoft Fabric Notebook Performance remediate

Systematic toolkit for diagnosing, analyzing, and resolving performance bottlenecks in Microsoft Fabric notebooks powered by Apache Spark.

When to Use This Skill

  • Fabric notebook cells are running slowly or timing out
  • Spark jobs are being throttled with HTTP 430 errors
  • Capacity Metrics app shows high CU consumption
  • Data skew is causing unbalanced task execution
  • Shuffle operations are consuming excessive resources
  • Delta Lake tables have degraded read/write performance
  • OOM (Out of Memory) errors during notebook execution
  • Spark Advisor shows warnings or errors in cell output
  • Session startup is slow or sessions expire unexpectedly
  • Pipeline-triggered notebooks are queued for extended periods

Prerequisites

  • Workspace Admin or Contributor role in the target Fabric workspace
  • Access to the Fabric Monitoring Hub for your capacity
  • Fabric Capacity Metrics app installed (for capacity-level analysis)
  • Familiarity with PySpark or Spark SQL syntax

remediate Decision Tree

Identify your symptom and follow the corresponding workflow.

Symptom Root Cause Category Action
Notebook cell runs for minutes on small data Spark session config or query plan See Spark Session Tuning
HTTP 430 error on job submission Capacity exhausted, concurrency limit See Capacity and Throttling
One task takes 10x longer than others Data skew See Data Skew Diagnosis
Write operations are slow V-Order overhead or small file problem See Delta Table Optimization
OOM / executor lost errors Memory pressure, partition sizing See Memory and Partition Tuning
Session expired / timed out Idle timeout settings See Common Errors
Notebook queued, never starts Queue limits for SKU See Capacity and Throttling

Read the full file on GitHub · 209 lines

Files

What ships with it

7 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. 12d ago First seen · 209 lines · 110 tokens per session scan A f395a7adf2d0

Subscribe to this mod's changes

fabric-notebook-perf-remediate is a skill published in the GitHub repository PatrickGallucci/fabric-skills (16 stars, last pushed 3mo ago), licensed MIT. It adds 110 tokens to every session and 2,032 once invoked, about $0.0006 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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