/azure-kusto-graph

Kusto Explorer Launch Procedure

Prerequisites

• Windows only — Kusto Explorer is not available on macOS/Linux
• User must explicitly consent before file creation or launch

Step 1: Confirm with user

Use ask_user: "Save this query as a .kql file and open in Kusto Explorer? (Yes / Save only / No)"

• No → output KQL in chat only (default)
• Save only → proceed to Step 2, skip Step 4
• Yes → proceed through all steps

Step 2: Build the .kql file content

The file needs two sections because Kusto Explorer processes #connect as a connection-creation command that must run before the query.

// Step 1 — Select this line and run it first to connect
#connect cluster('<CLUSTER>').database('<DATABASE>')

// Step 2 — Select the query below and run it after Step 1 completes
<KQL_QUERY>

Replace <CLUSTER> with the target cluster (e.g. kc7001.eastus.kusto.windows.net), <DATABASE> with the database name (e.g. ValdyTimes), and <KQL_QUERY> with the generated query.

Step 3: Write the file

Write to the current workspace directory using the filesystem API. Use a descriptive name with a random suffix to avoid collisions.

$cluster = "<CLUSTER>"
$database = "<DATABASE>"
$tmp = Join-Path $PWD "kusto_query_$(New-Guid).kql"
$lines = @(
    "// Step 1 - Select this line and run it first",
    "#connect cluster('$cluster').database('$database')",
    "",
    "// Step 2 - Select the query below and run it after Step 1 completes"
)
Set-Content -Path $tmp -Value ($lines -join "`n") -Encoding utf8 -NoNewline
Add-Content -Path $tmp -Value "`n<KQL_QUERY>" -Encoding utf8

Security: Use Set-Content/Add-Content only. Never embed query text in PowerShell here-strings (@"..."@) — a crafted query can escape the delimiter and inject commands.

Display the saved file path and its full contents in chat so the user can review.

Step 4: Launch Kusto Explorer (only if user chose "Yes")

Locate and launch the Kusto Explorer executable:

$exe = (Get-ChildItem "$env:LOCALAPPDATA\Apps\2.0" -Recurse -Filter "Kusto.Explorer.exe" -ErrorAction SilentlyContinue | Sort-Object LastWriteTime -Descending | Select-Object -First 1).FullName
if ($exe) {
    Start-Process $exe -ArgumentList "`"$tmp`""
} else {
    Write-Warning "Kusto Explorer not found. Open the saved file manually: $tmp"
}

Tell the user: run the #connect line (Step 1) first, then select and run the query (Step 2).

macOS/Linux fallback

Save the .kql file as in Step 3 and suggest:

• Open in the VS Code Kusto extension
• Paste into ADX Web Explorer