fabric-mirroring

fabric-mirroring is a skill for Claude Code from wardawgmalvicious/agent-config. It costs 231 tokens per session (4,176 once invoked), scanned A, original, MIT.

A guide to Mirroring in Microsoft Fabric, which brings an external database or catalog into OneLake, Fabric's shared data storage. It distinguishes copying data continuously from syncing metadata or loading change files yourself.

In plain words
What is it for?
Use it to identify the right mirroring type, understand where data remains or is copied, and configure or troubleshoot mirrored database items and their read-only SQL endpoint.
Why use it?
The word mirroring covers different methods with different data locations and update behavior, so choosing the wrong kind can lead to incorrect expectations.

Skill for Claude Code

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

Good fit Use it to identify the right mirroring type, understand where data remains or is copied, and configure or troubleshoot mirrored database items and their read-only SQL endpoint.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/wardawgmalvicious/agent-config/fabric-mirroring
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-mirroring
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-mirroring

README.md
[![agentmods](https://agentmods.dev/badge/skills/wardawgmalvicious/agent-config/fabric-mirroring/github.svg)](https://agentmods.dev/skills/wardawgmalvicious/agent-config/fabric-mirroring)
Your own site
<a href="https://agentmods.dev/skills/wardawgmalvicious/agent-config/fabric-mirroring"><img src="https://agentmods.dev/badge/skills/wardawgmalvicious/agent-config/fabric-mirroring/github.svg" alt="Measured on agentmods" height="20"></a>

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-mirroring

Your own site · 80×15
<a href="https://agentmods.dev/skills/wardawgmalvicious/agent-config/fabric-mirroring"><img src="https://agentmods.dev/badge/skills/wardawgmalvicious/agent-config/fabric-mirroring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 231 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,176 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 $0.00231 $0.04176
Opus 5 $0.00115 $0.02088
Sonnet 5 $0.00046 $0.00835
Haiku 4.5 $0.00023 $0.00418

Measured 2d ago against content hash 931be38dffaa, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

fabric-mirroring 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 2d 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.

skills/fabric/fabric-mirroring/SKILL.md · 364 lines

How it starts

The opening of the file, as written. The whole thing — 364 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mirroring in Fabric

Mirroring brings an external database or catalog into OneLake as a unit — no ETL pipeline, no orchestration, no compute you allocate. It creates a MirroredDatabase item plus an autogenerated read-only SQL analytics endpoint.

There is no local file artifact (unlike TMDL or PBIR). You configure mirroring in the portal or through the REST API.

1. Three kinds — settle this first

Every later answer depends on which kind you are in. All three are called "mirroring", and only one of them copies data.

Kind Mechanism Data location Latency
Database mirroring Continuous replication into OneLake as Delta Copied into OneLake Changes published as fast as every 15 s
Metadata mirroring Syncs catalog names, schemas, tables; reads through OneLake shortcuts Stays at the source Source access + shortcut time; no replication step
Open mirroring You write change files to a landing zone; Fabric merges them into Delta Copied into OneLake As fast as you land files

Database mirroring is source-driven, not polled. The source engine identifies changed data — SQL Server 2025 scans its own transaction log — and publishes to a Fabric landing zone. A replicator engine inside Fabric scans for new files at high frequency and merges them into the target Delta table. Backoff logic slows polling for idle tables to avoid loading the source engine, and resumes automatically when changes reappear.

Metadata mirroring supports cross-tenant consumption precisely because it is shortcuts underneath — you can read live governed data from another tenant via OneLake external data sharing with no copy.

2. Which kind each source uses

From the mirroring/overview platform table as of 2026-08-30.

Source Kind
Azure SQL Database, Azure SQL Managed Instance, SQL Server Database
Fabric SQL database Database — automatic, nothing to configure
Azure Cosmos DB Database
Azure Database for PostgreSQL Database
Azure Database for MySQL (preview) Database
Google BigQuery Database — GA as of Aug 2026
Oracle, SAP Database
SharePoint List (preview) Database
Snowflake Metadata
Azure Databricks Metadata (Unity Catalog structure)
Dremio catalog (preview) Metadata
AWS Glue catalog (preview) Metadata — Iceberg tables stay in S3
Azure Monitor (preview) Metadata — connection-based, surfaces via Eventhouse
Open mirrored database Open

Read the full file on GitHub · 364 lines

Files

What ships with it

2 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. 2d ago Changed 931be38dffaa
  2. 8d ago Changed · +5 lines 26b0f8aa6edc
  3. 12d ago First seen · 359 lines · 231 tokens per session scan A 9feef5fa17eb

Subscribe to this mod's changes

fabric-mirroring is a skill published in the GitHub repository wardawgmalvicious/agent-config (1 stars, last pushed today), licensed MIT. It adds 231 tokens to every session and 4,176 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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