A guide for querying Azure Data Explorer, also called Kusto or ADX, a service for storing and analyzing large amounts of logs, telemetry, and time-based data. It uses KQL, the query language for this service.

Use it to discover databases and table structures, run KQL queries, aggregate results, analyze time series, trace events, detect anomalies, and export or visualize findings.

It helps you inspect large datasets, find trends, connect related events, and investigate unusual patterns without manually reviewing records.

azure-kusto — Skill for Claude Code and Codex by jonathan-vella

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 jonathan-vella/apex-accelerator --skill azure-kusto

Clone the repo

git clone --depth 1 https://github.com/jonathan-vella/apex-accelerator

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jonathan-vella/apex-accelerator/azure-kusto/github.svg)](https://agentmods.dev/skills/jonathan-vella/apex-accelerator/azure-kusto)

Your own site

<a href="https://agentmods.dev/skills/jonathan-vella/apex-accelerator/azure-kusto"><img src="https://agentmods.dev/badge/skills/jonathan-vella/apex-accelerator/azure-kusto/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jonathan-vella/apex-accelerator/azure-kusto"><img src="https://agentmods.dev/badge/skills/jonathan-vella/apex-accelerator/azure-kusto.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 719 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00091	$0.00719
Opus 5	$0.00046	$0.00360
Sonnet 5	$0.00018	$0.00144
Haiku 4.5	$0.00009	$0.00072

Measured 7d ago against content hash 8b8a2b642bad, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

azure-kusto 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 7d 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.

.github/skills/azure-kusto/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Azure Data Explorer (Kusto) Query & Analytics

Execute KQL queries against Azure Data Explorer for fast, scalable big-data analytics on log, telemetry, and time-series data.

Prerequisites

Azure CLI authenticated (az login) with a subscription containing Kusto resources
RBAC: AllDatabasesViewer on the cluster, or Database Viewer per database
Azure MCP server configured in .vscode/mcp.json for the mcp_azure-mcp_kusto namespace; CLI fallback in references/fallback-strategy.md

Steps

Discover resources — list clusters and databases in the subscription
Explore schema — kusto_table_schema_get for table structure
Query data — kusto_query with a KQL expression
Analyse results — aggregate, visualise, export

Query Patterns Quick Reference

Pattern	Use For
Basic Data Retrieval	Quick inspection, recent events
Aggregation Analysis	Counting, distribution, top-N
Time Series Analytics	Performance monitoring, trends
Join and Correlation	Root-cause analysis, event tracing
Schema Discovery	Data model exploration

For full KQL syntax, examples, best practices, and performance tips, read references/query-patterns.md.

Rules

Always include a time-range filter (where Timestamp > ago(...)) on time-series tables
Use take/limit for exploratory queries
Filter early (where before join / summarize)
Use summarize for aggregations; bin() for time bucketing
Use project to select only needed columns

MCP Tools

Tool	Purpose
`kusto_cluster_list`	List Kusto clusters in a subscription
`kusto_database_list`	List databases in a cluster
`kusto_query`	Execute KQL against a database
`kusto_table_schema_get`	Retrieve table schema

Read the full file on GitHub · 72 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.

7d ago First seen · 72 lines · 91 tokens per session scan A 8b8a2b642bad

Subscribe to this mod's changes

azure-kusto is a skill published in the GitHub repository jonathan-vella/apex-accelerator (50 stars, last pushed 3d ago), licensed MIT. It adds 91 tokens to every session and 719 once invoked, about $0.0005 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 2026-09-03.

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