diff --git a/app/ai/onboarding.py b/app/ai/onboarding.py
new file mode 100644
index 0000000..8149328
--- /dev/null
+++ b/app/ai/onboarding.py
@@ -0,0 +1,154 @@
+"""Feature onboarding — setup wizard backend (I-ONB).
+
+Provides API endpoints for the setup wizard that guides users through
+configuring agents, workflows, knowledge, workstreams/miniapps,
+and proactive collaboration.
+"""
+
+from __future__ import annotations
+
+import logging
+import uuid
+from typing import Any
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+logger = logging.getLogger(__name__)
+
+
+async def get_onboarding_status(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    user_id: uuid.UUID,
+) -> dict[str, Any]:
+    """Get the onboarding progress for a user.
+
+    Returns which steps are completed: agent_created, workflow_created,
+    knowledge_enabled, workstream_enabled, proactive_enabled.
+    """
+    status: dict[str, Any] = {
+        "steps": {
+            "welcome": {"completed": True, "required": True},
+            "create_agent": {"completed": False, "required": True},
+            "create_workflow": {"completed": False, "required": False},
+            "enable_knowledge": {"completed": False, "required": False},
+            "enable_workstream": {"completed": False, "required": False},
+        },
+        "progress_pct": 20,  # Welcome is done
+    }
+
+    # Check if user has created an agent
+    try:
+        from app.models.workflow import AgentDefinition
+        from sqlalchemy import select, func
+        agent_count = await db.scalar(
+            select(func.count(AgentDefinition.id)).where(
+                AgentDefinition.tenant_id == tenant_id,
+                AgentDefinition.created_by == user_id,
+            )
+        )
+        if agent_count and agent_count > 0:
+            status["steps"]["create_agent"]["completed"] = True
+            status["progress_pct"] += 20
+    except Exception as e:
+        logger.warning("Onboarding agent check failed: %s", e)
+
+    # Check if user has created a workflow
+    try:
+        from app.models.workflow import WorkflowDefinition
+        from sqlalchemy import select, func
+        wf_count = await db.scalar(
+            select(func.count(WorkflowDefinition.id)).where(
+                WorkflowDefinition.tenant_id == tenant_id,
+                WorkflowDefinition.created_by == user_id,
+            )
+        )
+        if wf_count and wf_count > 0:
+            status["steps"]["create_workflow"]["completed"] = True
+            status["progress_pct"] += 20
+    except Exception as e:
+        logger.warning("Onboarding workflow check failed: %s", e)
+
+    # Check knowledge (wiki articles)
+    try:
+        from app.plugins.builtins.wiki.models import WikiArticle
+        from sqlalchemy import select, func
+        wiki_count = await db.scalar(
+            select(func.count(WikiArticle.id)).where(
+                WikiArticle.tenant_id == tenant_id,
+                WikiArticle.deleted_at.is_(None),
+            )
+        )
+        if wiki_count and wiki_count > 0:
+            status["steps"]["enable_knowledge"]["completed"] = True
+            status["progress_pct"] += 20
+    except Exception as e:
+        logger.warning("Onboarding knowledge check failed: %s", e)
+
+    # Check workstream (communication messages)
+    try:
+        from app.plugins.builtins.kommunikation.models import CommMessage
+        from sqlalchemy import select, func
+        msg_count = await db.scalar(
+            select(func.count(CommMessage.id)).where(
+                CommMessage.tenant_id == tenant_id,
+            )
+        )
+        if msg_count and msg_count > 0:
+            status["steps"]["enable_workstream"]["completed"] = True
+            status["progress_pct"] += 20
+    except Exception as e:
+        logger.warning("Onboarding workstream check failed: %s", e)
+
+    return status
+
+
+def get_onboarding_guide() -> dict[str, Any]:
+    """Get the onboarding guide content for the setup wizard.
+
+    Returns step-by-step instructions for each onboarding step.
+    """
+    return {
+        "steps": [
+            {
+                "id": "welcome",
+                "title": "Welcome to LeoCRM",
+                "description": "Get started with your AI-powered CRM platform.",
+                "icon": "sparkles",
+            },
+            {
+                "id": "create_agent",
+                "title": "Create Your First Agent",
+                "description": "Set up an AI agent to help with email triage, contact enrichment, or follow-ups.",
+                "icon": "bot",
+                "action_url": "/agents/new",
+            },
+            {
+                "id": "create_workflow",
+                "title": "Create Your First Workflow",
+                "description": "Automate repetitive tasks with workflows. Start with a template or build your own.",
+                "icon": "workflow",
+                "action_url": "/workflows/new",
+            },
+            {
+                "id": "enable_knowledge",
+                "title": "Enable Knowledge Base",
+                "description": "Create wiki articles and let AI find answers from your company knowledge.",
+                "icon": "book-open",
+                "action_url": "/wiki",
+            },
+            {
+                "id": "enable_workstream",
+                "title": "Enable Human-AI Workstream",
+                "description": "Connect humans, agents, and workflows in a unified communication stream.",
+                "icon": "message-square",
+                "action_url": "/workstream",
+            },
+        ],
+    }
+
+
+__all__ = [
+    "get_onboarding_status",
+    "get_onboarding_guide",
+]
diff --git a/tests/test_phase_i_integration.py b/tests/test_phase_i_integration.py
index 7a4e6e5..822da1a 100644
--- a/tests/test_phase_i_integration.py
+++ b/tests/test_phase_i_integration.py
@@ -514,3 +514,47 @@ class TestDSGVOExport:
         fields = _get_sensitive_fields()
         assert isinstance(fields, dict)
         assert len(fields) > 0
+
+
+# ─── I-ONB: Onboarding ──────────────────────────────────────────────────────
+
+
+class TestOnboarding:
+    """Test the onboarding module (I-ONB)."""
+
+    def test_onboarding_functions_importable(self):
+        """All onboarding functions are importable."""
+        from app.ai.onboarding import get_onboarding_status, get_onboarding_guide
+        assert callable(get_onboarding_status)
+        assert callable(get_onboarding_guide)
+
+    @pytest.mark.asyncio
+    async def test_get_onboarding_status_returns_dict(self):
+        """get_onboarding_status returns a dict with steps and progress."""
+        from app.ai.onboarding import get_onboarding_status
+
+        mock_db = AsyncMock()
+        mock_db.scalar = AsyncMock(return_value=0)
+
+        result = await get_onboarding_status(mock_db, uuid.uuid4(), uuid.uuid4())
+        assert isinstance(result, dict)
+        assert "steps" in result
+        assert "progress_pct" in result
+        assert "welcome" in result["steps"]
+        assert "create_agent" in result["steps"]
+        assert result["steps"]["welcome"]["completed"] is True
+
+    def test_get_onboarding_guide_returns_steps(self):
+        """get_onboarding_guide returns a list of steps."""
+        from app.ai.onboarding import get_onboarding_guide
+
+        result = get_onboarding_guide()
+        assert isinstance(result, dict)
+        assert "steps" in result
+        assert len(result["steps"]) == 5
+        step_ids = [s["id"] for s in result["steps"]]
+        assert "welcome" in step_ids
+        assert "create_agent" in step_ids
+        assert "create_workflow" in step_ids
+        assert "enable_knowledge" in step_ids
+        assert "enable_workstream" in step_ids