fabric-mlv

fabric-mlv is a skill for Claude Code from wardawgmalvicious/agent-config. It costs 245 tokens per session (4,620 once invoked), scanned A, original, MIT.

A guide for creating Materialized Lake Views in Microsoft Fabric, which are saved data transformations in a lakehouse. It covers SQL and preview PySpark methods for building and managing these views.

In plain words
What is it for?
Use it for bronze-to-silver-to-gold data pipelines, frequently queried aggregates, data-quality rules, and Fabric operations such as creating, refreshing, renaming, or dropping views.
Why use it?
It helps teams create refreshable reporting datasets and data-quality checks without writing their own notebook orchestration.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter.

Good fit Use it for bronze-to-silver-to-gold data pipelines, frequently queried aggregates, data-quality rules, and Fabric operations such as creating, refreshing, renaming, or dropping views.

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Install with agentmods
npx agentmods add skills/wardawgmalvicious/agent-config/fabric-mlv
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 wardawgmalvicious/agent-config --skill fabric-mlv
Clone the repo
git clone --depth 1 https://github.com/wardawgmalvicious/agent-config

Made for: Claude Code.

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-mlv

README.md
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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-mlv

Your own site · 80×15
<a href="https://agentmods.dev/skills/wardawgmalvicious/agent-config/fabric-mlv"><img src="https://agentmods.dev/badge/skills/wardawgmalvicious/agent-config/fabric-mlv.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 245 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,620 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 $0.00245 $0.04620
Opus 5 $0.00122 $0.02310
Sonnet 5 $0.00049 $0.00924
Haiku 4.5 $0.00024 $0.00462

Measured today against content hash ece577042946, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

fabric-mlv 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 today.

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/fabric-mlv/SKILL.md · 268 lines

How it starts

The opening of the file, as written. The whole thing — 268 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fabric Materialized Lake Views (MLV)

Declarative SQL/PySpark transformations that persist as Delta tables in a schema-enabled lakehouse. Fabric handles refresh strategy, dependency order, and data quality enforcement so you don't write notebook orchestration.

When to use vs not

Use MLVs for medallion bronze→silver→gold pipelines, frequently-queried aggregates, declarative data quality, and reporting datasets that need automatic refresh. Skip them for one-off queries, sub-second streaming (use Real-Time Intelligence), or transformations that need ML inference / external API calls / non-SQL Python (use a regular Spark notebook).

Prerequisites

  • Schema-enabled lakehouse — required. enableSchemas is immutable per lakehouse; you can't retrofit it.
  • Fabric Runtime 1.3 — earlier runtimes can't author MLVs. Upstream still names 1.3 exactly (checked 2026-08-29), and has not extended the prerequisite to Runtime 2.0 (GA Aug 2026 — Spark 4.1, Delta Lake 4.2, Python 3.13), so treat 2.0 as unverified for MLV authoring rather than assumed. This has a deadline: 2.0 is planned to become the default for new workspaces and environment items in late September 2026, at which point a new workspace stops defaulting to a runtime MLVs are documented against. Re-check the prerequisite then.
  • Region — not available in South Central US (as of 2026-04).
  • CDF on source tables — required for incremental refresh: ALTER TABLE bronze.x SET TBLPROPERTIES (delta.enableChangeDataFeed = true). Without it, optimal refresh degrades to skip-or-full only.

Spark SQL — CREATE

CREATE [OR REPLACE] MATERIALIZED LAKE VIEW [IF NOT EXISTS]
  [workspace.lakehouse.schema].MLV_Identifier
[(
    CONSTRAINT name1 CHECK (expr1) [ON MISMATCH DROP | FAIL],
    CONSTRAINT name2 CHECK (expr2) [ON MISMATCH DROP | FAIL]
)]
[PARTITIONED BY (col1, col2, ...)]
[COMMENT "..."]
[TBLPROPERTIES ("k1"="v1", ...)]
AS select_statement
Clause Notes
OR REPLACE Mutually exclusive with IF NOT EXISTS
CONSTRAINT ... CHECK Multiple allowed. Only deterministic built-ins permitted
ON MISMATCH DROP Silently drops violating rows. Each row dropped at most once even if it violates multiple constraints
ON MISMATCH FAIL Default. Stops the refresh with an error
PARTITIONED BY Improves filtered-read performance
TBLPROPERTIES Set delta.enableChangeDataFeed=true here to enable CDF on the MLV itself for downstream MLVs

Read the full file on GitHub · 268 lines

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. today Changed ece577042946
  2. 6d ago Changed · +3 lines 9af0f9632e62
  3. 10d ago First seen · 265 lines · 245 tokens per session scan A e68b47f44d9c

Subscribe to this mod's changes

fabric-mlv is a skill published in the GitHub repository wardawgmalvicious/agent-config (1 stars, last pushed today), licensed MIT. It adds 245 tokens to every session and 4,620 once invoked, about $0.0012 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 2026-08-31.

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