diff --git a/src/openjarvis/connectors/__init__.py b/src/openjarvis/connectors/__init__.py
index a48d0d71..9e935c8e 100644
--- a/src/openjarvis/connectors/__init__.py
+++ b/src/openjarvis/connectors/__init__.py
@@ -9,3 +9,11 @@ from openjarvis.connectors._stubs import (
 from openjarvis.connectors.store import KnowledgeStore
 
 __all__ = ["Attachment", "BaseConnector", "Document", "KnowledgeStore", "SyncStatus"]
+
+# Auto-register built-in connectors
+import openjarvis.connectors.obsidian  # noqa: F401
+
+try:
+    import openjarvis.connectors.gmail  # noqa: F401
+except ImportError:
+    pass  # httpx may not be installed
diff --git a/tests/connectors/test_integration.py b/tests/connectors/test_integration.py
new file mode 100644
index 00000000..d7489a8e
--- /dev/null
+++ b/tests/connectors/test_integration.py
@@ -0,0 +1,75 @@
+"""Integration test: Obsidian vault → SyncEngine → KnowledgeStore → knowledge_search."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from openjarvis.connectors.obsidian import ObsidianConnector
+from openjarvis.connectors.pipeline import IngestionPipeline
+from openjarvis.connectors.store import KnowledgeStore
+from openjarvis.connectors.sync_engine import SyncEngine
+from openjarvis.tools.knowledge_search import KnowledgeSearchTool
+
+# ---------------------------------------------------------------------------
+# Fixtures
+# ---------------------------------------------------------------------------
+
+
+@pytest.fixture
+def vault(tmp_path: Path) -> Path:
+    vault_dir = tmp_path / "test-vault"
+    vault_dir.mkdir()
+    (vault_dir / "project-notes.md").write_text(
+        "# Project Alpha\n\nWe decided to migrate to Kubernetes in March.\n\n"
+        "## Cost Analysis\n\n"
+        "Estimated 40% increase in cloud spend during transition.\n\n"
+        "## Timeline\n\nSix-week migration window starting April 1st."
+    )
+    (vault_dir / "meeting.md").write_text(
+        "# Sprint Review\n\nDiscussed budget concerns with Mike and Sarah.\n"
+        "Action item: Sarah to prepare cost comparison document."
+    )
+    return vault_dir
+
+
+# ---------------------------------------------------------------------------
+# Tests
+# ---------------------------------------------------------------------------
+
+
+def test_full_pipeline_obsidian_to_search(vault: Path, tmp_path: Path) -> None:
+    """End-to-end: Obsidian vault → SyncEngine → KnowledgeStore → knowledge_search."""
+    # 1. Setup
+    store = KnowledgeStore(db_path=str(tmp_path / "integration.db"))
+    pipeline = IngestionPipeline(store=store)
+    engine = SyncEngine(pipeline=pipeline, state_db=str(tmp_path / "state.db"))
+    connector = ObsidianConnector(vault_path=str(vault))
+
+    # 2. Sync
+    engine.sync(connector)
+
+    # 3. Verify checkpoint
+    cp = engine.get_checkpoint("obsidian")
+    assert cp is not None
+    # SyncEngine checkpoint records total chunks ingested (not document count).
+    # The two vault files produce 6 chunks via SemanticChunker (note strategy).
+    assert cp["items_synced"] == 6  # 6 chunks from 2 md files
+
+    # 4. Search via knowledge_search tool
+    tool = KnowledgeSearchTool(store=store)
+
+    result = tool.execute(query="Kubernetes migration")
+    assert result.success
+    assert "Kubernetes" in result.content
+
+    result = tool.execute(query="budget concerns")
+    assert result.success
+    assert "budget" in result.content.lower()
+
+    result = tool.execute(query="migration", source="obsidian")
+    assert result.success
+
+    result = tool.execute(query="migration", source="gmail")
+    assert "No relevant results" in result.content