# Fabric Notebook Loop > Develop Fabric notebooks using a local closed-loop cycle — author in .py locally, build to .Notebook format, deploy via REST API, execute, monitor, diagnose errors, fix, and redeploy. Use for iterative notebook development without portal interaction. Typically converges in 1–3 iterations. Cold-start time varies by capacity tier (≈3 min on F64, up to 8–12 min on F2/F4). Use when this capability is needed. - Skill: `tomevault-io/fabric-notebook-loop` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/fabric-notebook-loop` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/fabric-notebook-loop/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: DevOps & Infra - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/fabric-notebook-loop --- # fabric-notebook-loop Iterative Fabric notebook development without portal interaction. The skill is split into focused sections — traverse the linked nodes to pick up only what you need: - [[skills/fabric-notebook-loop/must]] — non-negotiable rules (cell markers, build/deploy/monitor, fetch-then-stop, kernel + sentinel rules) - [[skills/fabric-notebook-loop/prefer-avoid]] — recommended preferences and the explicit anti-patterns - [[skills/fabric-notebook-loop/the-loop]] — the author → build → deploy → smoke → fetch cycle, individual commands, cell structure, run-status interpretation - [[skills/fabric-notebook-loop/diagnosing-opaque-failures]] — three diagnostic paths for `System cancelled the Spark session` and the catalogue of common silent causes - [[skills/fabric-notebook-loop/mlflow-platform-limits]] — Fabric MLflow experiment-name validation and the SPN `MwcTokenValidationException` that blocks closed-loop MLflow - [[skills/fabric-notebook-loop/full-example]] — end-to-end CSV-to-Bronze example For diagnosing opaque smoke-test failures, also see `memory/skill-fixes/smoke-test-cell-errors.md`. For MLflow specifics: `memory/skill-fixes/fabric-mlflow-spn-blocked.md`, `memory/skill-fixes/fabric-mlflow-experiment-name.md`. --- > Source: [scardoso-lu/fabric-skills-settings](https://github.com/scardoso-lu/fabric-skills-settings) — distributed by [TomeVault](https://tomevault.io).