diff --git a/.github/actions/install-llama-stack-client/action.yml b/.github/actions/install-llama-stack-client/action.yml
index 3c1c77d9c..fc359f1fa 100644
--- a/.github/actions/install-llama-stack-client/action.yml
+++ b/.github/actions/install-llama-stack-client/action.yml
@@ -6,6 +6,10 @@ inputs:
     description: 'Client version to install on non-release branches (latest or published). Ignored on release branches.'
     required: false
     default: ""
+  sdk_install_url:
+    description: 'URL to install Python SDK from (for testing preview builds). If provided, overrides client-version.'
+    required: false
+    default: ""
 
 outputs:
   uv-extra-index-url:
@@ -25,6 +29,14 @@ runs:
       id: configure
       shell: bash
       run: |
+        # If sdk_install_url is provided (e.g., from Stainless preview), use it directly
+        if [ -n "${{ inputs.sdk_install_url }}" ]; then
+          echo "Using provided sdk_install_url: ${{ inputs.sdk_install_url }}"
+          echo "install-after-sync=true" >> $GITHUB_OUTPUT
+          echo "install-source=${{ inputs.sdk_install_url }}" >> $GITHUB_OUTPUT
+          exit 0
+        fi
+
         # Determine the branch we're working with
         BRANCH="${{ github.base_ref || github.ref }}"
         BRANCH="${BRANCH#refs/heads/}"
diff --git a/.github/actions/setup-runner/action.yml b/.github/actions/setup-runner/action.yml
index 6c642b310..b65288764 100644
--- a/.github/actions/setup-runner/action.yml
+++ b/.github/actions/setup-runner/action.yml
@@ -9,6 +9,10 @@ inputs:
     description: The llama-stack-client-python version to test against (latest or published)
     required: false
     default: "latest"
+  sdk_install_url:
+    description: 'URL to install Python SDK from (for testing preview builds). If provided, overrides client-version.'
+    required: false
+    default: ""
 runs:
   using: "composite"
   steps:
@@ -22,6 +26,7 @@ runs:
       uses: ./.github/actions/install-llama-stack-client
       with:
         client-version: ${{ inputs.client-version }}
+        sdk_install_url: ${{ inputs.sdk_install_url }}
 
     - name: Install dependencies
       shell: bash
diff --git a/.github/actions/setup-test-environment/action.yml b/.github/actions/setup-test-environment/action.yml
index 1c9d019cc..55d403406 100644
--- a/.github/actions/setup-test-environment/action.yml
+++ b/.github/actions/setup-test-environment/action.yml
@@ -8,6 +8,10 @@ inputs:
   client-version:
     description: 'Client version (latest or published)'
     required: true
+  sdk_install_url:
+    description: 'URL to install Python SDK from (for testing preview builds). If provided, overrides client-version.'
+    required: false
+    default: ''
   setup:
     description: 'Setup to configure (ollama, vllm, gpt, etc.)'
     required: false
@@ -28,6 +32,7 @@ runs:
       with:
         python-version: ${{ inputs.python-version }}
         client-version: ${{ inputs.client-version }}
+        sdk_install_url: ${{ inputs.sdk_install_url }}
 
     - name: Setup ollama
       if: ${{ (inputs.setup == 'ollama' || inputs.setup == 'ollama-vision') && inputs.inference-mode == 'record' }}
@@ -65,6 +70,15 @@ runs:
           sleep 2
         done
 
+    - name: Verify client installation
+      shell: bash
+      run: |
+        echo "Verifying llama-stack-client installation:"
+        uv pip show llama-stack-client || echo "llama-stack-client not found"
+        echo ""
+        echo "All installed llama packages:"
+        uv pip list | grep llama || true
+
     - name: Build Llama Stack
       shell: bash
       run: |
diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index b731dfae7..f3b5b95a9 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -37,6 +37,22 @@ on:
         description: 'Test against a specific setup'
         type: string
         default: 'ollama'
+  workflow_call:
+    inputs:
+      sdk_install_url:
+        required: false
+        type: string
+        description: 'URL to install Python SDK from (for testing preview builds)'
+      matrix_key:
+        required: false
+        type: string
+        default: 'default'
+        description: 'Matrix configuration key from ci_matrix.json (e.g., "default", "stainless")'
+      test-all-client-versions:
+        required: false
+        type: boolean
+        default: false
+        description: 'Test against both the latest and published versions'
 
 concurrency:
   # Skip concurrency for pushes to main - each commit should be tested independently
@@ -55,11 +71,12 @@ jobs:
       - name: Generate test matrix
         id: set-matrix
         run: |
-          # Generate matrix from CI_MATRIX in tests/integration/suites.py
-          # Supports schedule-based and manual input overrides
+          # Generate matrix from CI_MATRIX in tests/integration/ci_matrix.json
+          # Supports schedule-based, manual input, and workflow_call overrides
           MATRIX=$(PYTHONPATH=. python3 scripts/generate_ci_matrix.py \
             --schedule "${{ github.event.schedule }}" \
-            --test-setup "${{ github.event.inputs.test-setup }}")
+            --test-setup "${{ github.event.inputs.test-setup || '' }}" \
+            --matrix-key "${{ inputs.matrix_key || 'default' }}")
           echo "matrix=$MATRIX" >> $GITHUB_OUTPUT
           echo "Generated matrix: $MATRIX"
 
@@ -75,8 +92,8 @@ jobs:
         # Use Python 3.13 only on nightly schedule (daily latest client test), otherwise use 3.12
         python-version: ${{ github.event.schedule == '0 0 * * *' && fromJSON('["3.12", "3.13"]') || fromJSON('["3.12"]') }}
         node-version: [22]
-        client-version: ${{ (github.event.schedule == '0 0 * * *' || github.event.inputs.test-all-client-versions == 'true') && fromJSON('["published", "latest"]') || fromJSON('["latest"]') }}
-        # Test configurations: Generated from CI_MATRIX in tests/integration/suites.py
+        client-version: ${{ (github.event.schedule == '0 0 * * *' || github.event.inputs.test-all-client-versions == 'true' || inputs.test-all-client-versions == true) && fromJSON('["published", "latest"]') || fromJSON('["latest"]') }}
+        # Test configurations: Generated from CI_MATRIX in tests/integration/ci_matrix.json
         # See scripts/generate_ci_matrix.py for generation logic
         config: ${{ fromJSON(needs.generate-matrix.outputs.matrix).include }}
 
@@ -90,6 +107,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           client-version: ${{ matrix.client-version }}
+          sdk_install_url: ${{ inputs.sdk_install_url || '' }}
           setup: ${{ matrix.config.setup }}
           suite: ${{ matrix.config.suite }}
           inference-mode: 'replay'
diff --git a/.github/workflows/stainless-builds.yml b/.github/workflows/stainless-builds.yml
index 5ab0cb4e0..880324756 100644
--- a/.github/workflows/stainless-builds.yml
+++ b/.github/workflows/stainless-builds.yml
@@ -22,6 +22,10 @@ on:
         description: 'PR number to run Stainless build for'
         required: true
         type: number
+      sdk_install_url:
+        description: 'Python SDK install URL (optional, for testing specific builds)'
+        required: false
+        type: string
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || inputs.pr_number || github.run_id }}
@@ -61,6 +65,7 @@ jobs:
       pr_head_sha: ${{ steps.compute.outputs.pr_head_sha }}
       pr_base_sha: ${{ steps.compute.outputs.pr_base_sha }}
       pr_base_ref: ${{ steps.compute.outputs.pr_base_ref }}
+      pr_title: ${{ steps.compute.outputs.pr_title }}
     steps:
       - name: Fetch PR details for workflow_dispatch
         if: github.event_name == 'workflow_dispatch'
@@ -68,7 +73,7 @@ jobs:
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
-          PR_DATA=$(gh pr view ${{ inputs.pr_number }} --repo ${{ github.repository }} --json headRefName,headRepository,headRefOid,baseRefName,baseRefOid,headRepositoryOwner)
+          PR_DATA=$(gh pr view ${{ inputs.pr_number }} --repo ${{ github.repository }} --json headRefName,headRepository,headRefOid,baseRefName,baseRefOid,headRepositoryOwner,title)
           echo "pr_data=$PR_DATA" >> $GITHUB_OUTPUT
 
       - name: Compute branch names
@@ -84,6 +89,7 @@ jobs:
             HEAD_SHA=$(echo "$PR_DATA" | jq -r '.headRefOid')
             BASE_SHA=$(echo "$PR_DATA" | jq -r '.baseRefOid')
             BASE_REF=$(echo "$PR_DATA" | jq -r '.baseRefName')
+            PR_TITLE=$(echo "$PR_DATA" | jq -r '.title')
           else
             # Use pull_request_target event data
             HEAD_REPO="${{ github.event.pull_request.head.repo.full_name }}"
@@ -92,6 +98,7 @@ jobs:
             HEAD_SHA="${{ github.event.pull_request.head.sha }}"
             BASE_SHA="${{ github.event.pull_request.base.sha }}"
             BASE_REF="${{ github.event.pull_request.base.ref }}"
+            PR_TITLE="${{ github.event.pull_request.title }}"
           fi
 
           BASE_REPO="${{ github.repository }}"
@@ -118,14 +125,20 @@ jobs:
           echo "pr_head_sha=${HEAD_SHA}" >> $GITHUB_OUTPUT
           echo "pr_base_sha=${BASE_SHA}" >> $GITHUB_OUTPUT
           echo "pr_base_ref=${BASE_REF}" >> $GITHUB_OUTPUT
+          echo "pr_title=${PR_TITLE}" >> $GITHUB_OUTPUT
 
   preview:
     needs: compute-branch
-    if: github.event_name == 'workflow_dispatch' || github.event.action != 'closed'
+    # Skip preview if workflow_dispatch provides sdk_install_url, or if PR is being closed
+    if: |
+      (github.event_name == 'workflow_dispatch' && inputs.sdk_install_url == '') ||
+      (github.event_name == 'pull_request_target' && github.event.action != 'closed')
     runs-on: ubuntu-latest
     permissions:
       contents: read
       pull-requests: write
+    outputs:
+      sdk_install_url: ${{ fromJSON(steps.run-preview.outputs.outcomes || '{}').python.install_url || '' }}
     steps:
       # Checkout the PR's code to access the OpenAPI spec and config files.
       # This is necessary to read the spec/config from the PR (including from forks).
@@ -137,7 +150,10 @@ jobs:
           fetch-depth: 2
 
       - name: Run preview builds
+        id: run-preview
         uses: stainless-api/upload-openapi-spec-action/preview@979824f1ea5f44334940f0768d04642b6cdaa0d1 # 1.8.1
+        env:
+          PR_NUMBER: ${{ inputs.pr_number || github.event.pull_request.number }}
         with:
           stainless_api_key: ${{ secrets.STAINLESS_API_KEY }}
           org: ${{ env.STAINLESS_ORG }}
@@ -150,6 +166,21 @@ jobs:
           head_sha: ${{ needs.compute-branch.outputs.pr_head_sha }}
           branch: ${{ needs.compute-branch.outputs.preview_branch }}
           base_branch: ${{ needs.compute-branch.outputs.base_branch }}
+          commit_message: ${{ needs.compute-branch.outputs.pr_title }}
+          make_comment: true
+
+  run-integration-tests:
+    needs: [compute-branch, preview]
+    if: |
+      always() &&
+      (needs.preview.result == 'success' || needs.preview.result == 'skipped') &&
+      (github.event_name == 'workflow_dispatch' || github.event.action != 'closed')
+    uses: ./.github/workflows/integration-tests.yml
+    with:
+      # Use provided sdk_install_url from workflow_dispatch, or from preview build
+      sdk_install_url: ${{ inputs.sdk_install_url || needs.preview.outputs.sdk_install_url }}
+      matrix_key: 'stainless'
+      test-all-client-versions: false
 
   merge:
     needs: compute-branch
diff --git a/scripts/generate_ci_matrix.py b/scripts/generate_ci_matrix.py
index 0d4e924b3..f6e68ba8a 100755
--- a/scripts/generate_ci_matrix.py
+++ b/scripts/generate_ci_matrix.py
@@ -24,24 +24,30 @@ DEFAULT_MATRIX = matrix_config["default"]
 SCHEDULE_MATRICES: dict[str, list[dict[str, str]]] = matrix_config.get("schedules", {})
 
 
-def generate_matrix(schedule="", test_setup=""):
+def generate_matrix(schedule="", test_setup="", matrix_key="default"):
     """
-    Generate test matrix based on schedule or manual input.
+    Generate test matrix based on schedule, manual input, or matrix key.
 
     Args:
         schedule: GitHub cron schedule string (e.g., "1 0 * * 0" for weekly)
         test_setup: Manual test setup input (e.g., "ollama-vision")
+        matrix_key: Matrix configuration key from ci_matrix.json (e.g., "default", "stainless")
 
     Returns:
         Matrix configuration as JSON string
     """
-    # Weekly scheduled test matrices
+    # Weekly scheduled test matrices (highest priority)
     if schedule and schedule in SCHEDULE_MATRICES:
         matrix = SCHEDULE_MATRICES[schedule]
     # Manual input for specific setup
     elif test_setup == "ollama-vision":
         matrix = [{"suite": "vision", "setup": "ollama-vision"}]
-    # Default: use JSON-defined matrix
+    # Use specified matrix key from ci_matrix.json
+    elif matrix_key:
+        if matrix_key not in matrix_config:
+            raise ValueError(f"Invalid matrix_key '{matrix_key}'. Available keys: {list(matrix_config.keys())}")
+        matrix = matrix_config[matrix_key]
+    # Default: use JSON-defined default matrix
     else:
         matrix = DEFAULT_MATRIX
 
@@ -55,7 +61,8 @@ if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="Generate CI test matrix")
     parser.add_argument("--schedule", default="", help="GitHub schedule cron string")
     parser.add_argument("--test-setup", default="", help="Manual test setup input")
+    parser.add_argument("--matrix-key", default="default", help="Matrix configuration key from ci_matrix.json")
 
     args = parser.parse_args()
 
-    print(generate_matrix(args.schedule, args.test_setup))
+    print(generate_matrix(args.schedule, args.test_setup, args.matrix_key))
diff --git a/tests/integration/ci_matrix.json b/tests/integration/ci_matrix.json
index 43678e5c7..fcadf95df 100644
--- a/tests/integration/ci_matrix.json
+++ b/tests/integration/ci_matrix.json
@@ -6,6 +6,9 @@
     {"suite": "responses", "setup": "gpt"},
     {"suite": "base-vllm-subset", "setup": "vllm"}
   ],
+  "stainless": [
+    {"suite": "base", "setup": "ollama", "allowed_clients": ["library"]}
+  ],
   "schedules": {
     "1 0 * * 0": [
       {"suite": "base", "setup": "vllm"}