fix: send messages in chat format in MCP add_memory tool (#1275)

brentkearney · claude · CaralHsi · web-flow · commit f354acfbbf20 · 2026-03-26T12:03:51.000+08:00
The /product/add endpoint expects messages as a list of chat message
objects, not a plain string. When passed a string, the SimpleStruct
MemReader silently skips it and no memory is stored.

Co-authored-by: Claude Opus 4.6 &lt;noreply@anthropic.com&gt;
Co-authored-by: CaralHsi &lt;caralhsi@gmail.com&gt;
diff --git a/examples/mem_mcp/simple_fastmcp_serve.py b/examples/mem_mcp/simple_fastmcp_serve.py
@@ -23,7 +23,7 @@ def add_memory(memory_content: str, user_id: str, cube_id: str | None = None):
     """Add memory using the Server API."""
     payload = {
         "user_id": user_id,
-        "messages": memory_content,
+        "messages": [{"role": "user", "content": memory_content}],
         "writable_cube_ids": [cube_id] if cube_id else None,
     }
     try:

Original file line number	Diff line number	Diff line change
`@@ -23,7 +23,7 @@ def add_memory(memory_content: str, user_id: str, cube_id: str \| None = None):`
`23`	`23`	`"""Add memory using the Server API."""`
`24`	`24`	`payload = {`
`25`	`25`	`"user_id": user_id,`
`26`		`- "messages": memory_content,`
	`26`	`+ "messages": [{"role": "user", "content": memory_content}],`
`27`	`27`	`"writable_cube_ids": [cube_id] if cube_id else None,`
`28`	`28`	`}`
`29`	`29`	`try:`