Fix Issue #12 tests and add OpenBrain repo guidance

README.md

@@ -18,6 +18,7 @@ OpenBrain is a Model Context Protocol (MCP) server that provides AI agents with
 | Tool | Description |
 |------|-------------|
 | `store` | Store a memory with automatic embedding generation and keyword extraction |
+| `batch_store` | Store 1-50 memories atomically in a single call |
 | `query` | Search memories by semantic similarity |
 | `purge` | Delete memories by agent ID or time range |
 
@@ -147,6 +148,32 @@ Health Check: http://localhost:3100/mcp/health
 }
 ```
 
+### Example: Batch Store Memories
+
+```json
+{
+  "jsonrpc": "2.0",
+  "id": 3,
+  "method": "tools/call",
+  "params": {
+    "name": "batch_store",
+    "arguments": {
+      "agent_id": "assistant-1",
+      "entries": [
+        {
+          "content": "The user prefers dark mode",
+          "metadata": {"category": "preference"}
+        },
+        {
+          "content": "The user uses vim keybindings",
+          "metadata": {"category": "preference"}
+        }
+      ]
+    }
+  }
+}
+```
+
 ## Architecture
 
 ```