diff --git a/azure-pipelines-pr.yml b/azure-pipelines-pr.yml
index 407d0044ed..cdf052e09b 100644
--- a/azure-pipelines-pr.yml
+++ b/azure-pipelines-pr.yml
@@ -163,6 +163,12 @@ stages:
           steps:
           - checkout: self
             clean: true
+          - bash: |
+              set -euo pipefail
+              bash eng/pipelines/linux-disk-usage.sh "Before SDK installation"
+              bash eng/pipelines/linux-sdk-staging.sh snapshot
+            displayName: Measure Linux disk usage before SDK installation
+          # UseDotNet downloads and extracts into Agent.TempDirectory before copying into .dotnet.
           - task: UseDotNet@2
             displayName: Install .NET 8 SDK
             inputs:
@@ -181,6 +187,15 @@ stages:
               packageType: sdk
               version: 10.x
               installationPath: $(Build.SourcesDirectory)/.dotnet
+          - bash: bash eng/pipelines/linux-disk-usage.sh "After SDK installation"
+            displayName: Measure Linux disk usage after SDK installation
+            condition: succeededOrFailed()
+          - bash: |
+              set -euo pipefail
+              bash eng/pipelines/linux-sdk-staging.sh clean
+              bash eng/pipelines/linux-disk-usage.sh "After SDK staging cleanup"
+            displayName: Clean Linux SDK download and extraction staging
+            condition: succeededOrFailed()
           - script: eng/common/build.sh
               --configuration $(_BuildConfig)
               --prepareMachine
@@ -188,6 +203,9 @@ stages:
             name: Build
             displayName: Build
             condition: succeeded()
+          - bash: bash eng/pipelines/linux-disk-usage.sh "After build"
+            displayName: Measure Linux disk usage after build
+            condition: succeededOrFailed()
 
 - ${{ if or(eq(variables['System.TeamProject'], 'public'), in(variables['Build.Reason'], 'PullRequest')) }}:
   - stage: integration
@@ -198,4 +216,3 @@ stages:
       parameters:
         buildConfig: Release
         poolVmImage: windows-latest
-
diff --git a/eng/pipelines/linux-disk-usage.sh b/eng/pipelines/linux-disk-usage.sh
new file mode 100644
index 0000000000..3b7786a018
--- /dev/null
+++ b/eng/pipelines/linux-disk-usage.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "Disk usage: $1"
+df -h / "$BUILD_SOURCESDIRECTORY" "$AGENT_TEMPDIRECTORY"
+for path in \
+    "$BUILD_SOURCESDIRECTORY/.dotnet" \
+    "$BUILD_SOURCESDIRECTORY/artifacts" \
+    "${NUGET_PACKAGES:-$HOME/.nuget/packages}" \
+    "$AGENT_TEMPDIRECTORY"; do
+    if [[ -e "$path" ]]; then
+        du -sh "$path"
+    fi
+done
diff --git a/eng/pipelines/linux-sdk-staging.sh b/eng/pipelines/linux-sdk-staging.sh
new file mode 100644
index 0000000000..cce67564d4
--- /dev/null
+++ b/eng/pipelines/linux-sdk-staging.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+snapshot="$PIPELINE_WORKSPACE/scaffolding-sdk-temp-before.txt"
+
+case "${1:-}" in
+    snapshot)
+        find "$AGENT_TEMPDIRECTORY" -mindepth 1 -maxdepth 1 -printf '%f\n' | sort > "$snapshot"
+        ;;
+    clean)
+        if [[ ! -f "$snapshot" ]]; then
+            echo "Missing SDK staging snapshot: $snapshot" >&2
+            exit 1
+        fi
+
+        after="$(mktemp "$PIPELINE_WORKSPACE/scaffolding-sdk-temp-after.XXXXXX")"
+        new_entries="$(mktemp "$PIPELINE_WORKSPACE/scaffolding-sdk-temp-new.XXXXXX")"
+        trap 'rm -f -- "$after" "$new_entries"' EXIT
+        find "$AGENT_TEMPDIRECTORY" -mindepth 1 -maxdepth 1 -printf '%f\n' | sort > "$after"
+        comm -13 "$snapshot" "$after" > "$new_entries"
+
+        while IFS= read -r name; do
+            [[ "$name" =~ ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ ]] || continue
+            path="$AGENT_TEMPDIRECTORY/$name"
+            if [[ -d "$path" ]]; then
+                [[ -d "$path/sdk" && -d "$path/shared/Microsoft.NETCore.App" ]] || continue
+                sdk_dir="$(find "$path/sdk" -mindepth 1 -maxdepth 1 -type d \( -name '8.*' -o -name '9.*' -o -name '10.*' \) -print -quit)"
+                [[ -n "$sdk_dir" ]] || continue
+            elif [[ -f "$path" ]]; then
+                [[ "$(file -b --mime-type "$path")" == application/gzip ]] || continue
+                tar --force-local -tzf "$path" | awk '/(^|\/)sdk\/(8|9|10)\./ { found = 1 } END { exit !found }' || continue
+            else
+                continue
+            fi
+
+            du -sh -- "$path"
+            rm -rf -- "$path"
+        done < "$new_entries"
+        rm -f -- "$snapshot"
+        ;;
+    *)
+        echo "Usage: $0 snapshot|clean" >&2
+        exit 1
+        ;;
+esac