diff --git a/app/ai/agent_memory.py b/app/ai/agent_memory.py
new file mode 100644
index 0000000..dd2227f
--- /dev/null
+++ b/app/ai/agent_memory.py
@@ -0,0 +1,236 @@
+"""Agent memory facade — unified API for persistent agent memory.
+
+Delegates to the ``agent_memory`` plugin (pgvector semantic search) and
+provides the canonical function signatures used by the agent framework
+(``store_agent_memory``, ``retrieve_agent_memory``, ``search_agent_memory``).
+
+Used by:
+- ``app/ai/agent_loop.py`` — memory retrieval during ReAct loops
+- ``app/plugins/builtins/automation`` — agent memory tools
+"""
+
+from __future__ import annotations
+
+import logging
+import uuid
+from typing import Any
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+logger = logging.getLogger(__name__)
+
+# Memory types supported by the agent memory system.
+MEMORY_TYPES = ("observation", "preference", "fact", "context")
+
+
+def _memory_type(value: str | None) -> str:
+    """Normalize a memory type to a supported value."""
+    if value in MEMORY_TYPES:
+        return value
+    return "fact"
+
+
+async def store_agent_memory(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    agent_id: uuid.UUID,
+    memory_type: str,
+    content: str,
+    metadata: dict[str, Any] | None = None,
+) -> uuid.UUID:
+    """Store a new agent memory with semantic embedding.
+
+    Args:
+        db: Database session.
+        tenant_id: Tenant UUID.
+        agent_id: Agent UUID.
+        memory_type: One of ``observation``, ``preference``, ``fact``, ``context``.
+        content: Memory content text.
+        metadata: Optional metadata dict (stored as JSONB on the memory row).
+
+    Returns:
+        The UUID of the created memory.
+    """
+    from app.plugins.builtins.agent_memory.services import store_memory
+
+    result = await store_memory(
+        db=db,
+        tenant_id=tenant_id,
+        agent_id=agent_id,
+        content=content,
+        memory_type=_memory_type(memory_type),
+    )
+    memory_id = uuid.UUID(result["id"])
+
+    # Persist optional metadata on the memory row.
+    if metadata:
+        from sqlalchemy import update
+
+        from app.plugins.builtins.agent_memory.models import AgentMemory
+
+        await db.execute(
+            update(AgentMemory)
+            .where(AgentMemory.id == memory_id)
+            .values(metadata_=metadata)
+        )
+        await db.flush()
+
+    return memory_id
+
+
+async def retrieve_agent_memory(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    agent_id: uuid.UUID,
+    memory_type: str | None = None,
+    limit: int = 10,
+) -> list[dict[str, Any]]:
+    """Retrieve recent memories for an agent, optionally filtered by type.
+
+    Args:
+        db: Database session.
+        tenant_id: Tenant UUID.
+        agent_id: Agent UUID.
+        memory_type: Optional memory type filter.
+        limit: Maximum number of results (default 10).
+
+    Returns:
+        List of memory dicts, newest first.
+    """
+    from sqlalchemy import select
+
+    from app.plugins.builtins.agent_memory.models import AgentMemory
+
+    stmt = (
+        select(AgentMemory)
+        .where(
+            AgentMemory.tenant_id == tenant_id,
+            AgentMemory.agent_id == agent_id,
+            AgentMemory.deleted_at.is_(None),
+        )
+        .order_by(AgentMemory.created_at.desc())
+        .limit(limit)
+    )
+    if memory_type:
+        stmt = stmt.where(AgentMemory.memory_type == _memory_type(memory_type))
+
+    result = await db.execute(stmt)
+    memories = result.scalars().all()
+    return [
+        {
+            "id": str(m.id),
+            "agent_id": str(m.agent_id),
+            "memory_type": m.memory_type,
+            "content": m.content,
+            "metadata": getattr(m, "metadata_", None) or {},
+            "created_at": m.created_at.isoformat() if m.created_at else None,
+        }
+        for m in memories
+    ]
+
+
+async def search_agent_memory(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    agent_id: uuid.UUID,
+    query: str,
+    limit: int = 5,
+) -> list[dict[str, Any]]:
+    """Semantic search over agent memories using pgvector embeddings.
+
+    Falls back to recent-memory retrieval when embedding generation is
+    unavailable (e.g. no embedding model configured).
+
+    Args:
+        db: Database session.
+        tenant_id: Tenant UUID.
+        agent_id: Agent UUID.
+        query: Natural language query.
+        limit: Maximum number of results (default 5).
+
+    Returns:
+        List of memory dicts with similarity scores, sorted by relevance.
+    """
+    from app.plugins.builtins.agent_memory.services import retrieve_relevant_memories
+
+    return await retrieve_relevant_memories(
+        db=db,
+        tenant_id=tenant_id,
+        agent_id=agent_id,
+        query=query,
+        limit=limit,
+        min_score=0.0,
+    )
+
+
+def register_agent_memory_tools(registry) -> None:
+    """Register agent memory tools in the global ToolRegistry.
+
+    Registers ``search_agent_memory`` so AI agents can query their own
+    persistent memory during ReAct loops.
+    """
+    import json
+
+    async def search_agent_memory_handler(
+        arguments: dict[str, Any], context: dict[str, Any]
+    ) -> str:
+        """Handle search_agent_memory tool call from an AI agent."""
+        from app.core.db import get_session_factory
+
+        query = arguments.get("query", "")
+        limit = arguments.get("limit", 5)
+        agent_id_str = context.get("agent_id", "")
+        tenant_id_str = context.get("tenant_id", "")
+
+        if not query:
+            return json.dumps({"error": "Missing query"})
+        try:
+            tenant_id = uuid.UUID(tenant_id_str) if tenant_id_str else uuid.uuid4()
+            agent_id = uuid.UUID(agent_id_str) if agent_id_str else uuid.uuid4()
+        except (ValueError, TypeError):
+            return json.dumps({"error": "Invalid tenant_id or agent_id"})
+
+        factory = get_session_factory()
+        async with factory() as db:
+            results = await search_agent_memory(
+                db=db,
+                tenant_id=tenant_id,
+                agent_id=agent_id,
+                query=query,
+                limit=limit,
+            )
+        return json.dumps({"memories": results, "count": len(results)}, default=str)
+
+    registry.register(
+        name="search_agent_memory",
+        description=(
+            "Semantische Suche über das persistente Gedächtnis eines Agents. "
+            "Findet relevante frühere Beobachtungen, Fakten und Präferenzen."
+        ),
+        parameters={
+            "type": "object",
+            "properties": {
+                "query": {
+                    "type": "string",
+                    "description": "Natürlichsprachliche Suchanfrage",
+                },
+                "limit": {
+                    "type": "integer",
+                    "default": 5,
+                    "description": "Maximale Anzahl Ergebnisse",
+                },
+            },
+            "required": ["query"],
+        },
+        handler=search_agent_memory_handler,
+        plugin_name="agent_memory",
+        required_permission="agent_memory:read",
+        category="memory",
+    )
+    logger.info("Agent memory tool 'search_agent_memory' registered")
+
+
+def unregister_agent_memory_tools(registry) -> None:
+    """Unregister agent memory tools from the global ToolRegistry."""
+    registry.unregister("search_agent_memory")
+    logger.info("Agent memory tool 'search_agent_memory' unregistered")
diff --git a/app/plugins/builtins/agent_memory/migrations/0002_metadata.sql b/app/plugins/builtins/agent_memory/migrations/0002_metadata.sql
new file mode 100644
index 0000000..e76a72d
--- /dev/null
+++ b/app/plugins/builtins/agent_memory/migrations/0002_metadata.sql
@@ -0,0 +1,3 @@
+-- Agent Memory: add metadata JSONB column for structured memory metadata
+
+ALTER TABLE agent_memories ADD COLUMN IF NOT EXISTS metadata JSONB;
diff --git a/app/plugins/builtins/agent_memory/models.py b/app/plugins/builtins/agent_memory/models.py
index 33ca6d4..7864f12 100644
--- a/app/plugins/builtins/agent_memory/models.py
+++ b/app/plugins/builtins/agent_memory/models.py
@@ -3,8 +3,10 @@
 from __future__ import annotations
 
 import uuid
+from typing import Any
 
 from sqlalchemy import Index, String, Text
+from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -35,5 +37,8 @@ class AgentMemory(Base, TenantMixin, OwnedMixin):
         String(50), nullable=False, default="fact"
     )
     content: Mapped[str] = mapped_column(Text, nullable=False)
+    metadata_: Mapped[dict[str, Any] | None] = mapped_column(
+        "metadata", JSONB, nullable=True
+    )
     # embedding column is managed via raw SQL (pgvector extension)
     # embedding vector(768) — see migration 0001_initial.sql