fix: try and patch the PATCH/update issue with MCP server URL [LET-3933]

* fix: patch update path

* autogenerate

* update

* update

---------

Co-authored-by: Jin Peng <jinjpeng@Jins-MacBook-Pro.local>
Co-authored-by: Letta Bot <noreply@letta.com>
Co-authored-by: jnjpng <jin@letta.com>

letta/schemas/mcp.py

@@ -84,7 +84,6 @@ class MCPServer(BaseMCPServer):
 class UpdateSSEMCPServer(LettaBase):
     """Update an SSE MCP server"""
 
-    server_name: Optional[str] = Field(None, description="The name of the server")
     server_url: Optional[str] = Field(None, description="The URL of the server (MCP SSE client will connect to this URL)")
     token: Optional[str] = Field(None, description="The access token or API key for the MCP server (used for SSE authentication)")
     custom_headers: Optional[Dict[str, str]] = Field(None, description="Custom authentication headers as key-value pairs")
@@ -93,7 +92,6 @@ class UpdateSSEMCPServer(LettaBase):
 class UpdateStdioMCPServer(LettaBase):
     """Update a Stdio MCP server"""
 
-    server_name: Optional[str] = Field(None, description="The name of the server")
     stdio_config: Optional[StdioServerConfig] = Field(
         None, description="The configuration for the server (MCP 'local' client will run this command)"
     )
@@ -102,7 +100,6 @@ class UpdateStdioMCPServer(LettaBase):
 class UpdateStreamableHTTPMCPServer(LettaBase):
     """Update a Streamable HTTP MCP server"""
 
-    server_name: Optional[str] = Field(None, description="The name of the server")
     server_url: Optional[str] = Field(None, description="The URL path for the streamable HTTP server (e.g., 'example/mcp')")
     auth_header: Optional[str] = Field(None, description="The name of the authentication header (e.g., 'Authorization')")
     auth_token: Optional[str] = Field(None, description="The authentication token or API key value")

project.json

@@ -26,10 +26,7 @@
     "dev": {
       "executor": "@nxlv/python:run-commands",
       "options": {
-        "commands": [
-          "./otel/start-otel-collector.sh",
-          "uv run letta server"
-        ],
+        "commands": ["./otel/start-otel-collector.sh", "uv run letta server"],
         "parallel": true,
         "cwd": "apps/core"
       }

tests/mcp_tests/test_mcp.py

@@ -375,3 +375,68 @@ async def test_streamable_http_mcp_server_update_schema_no_docstring_required(cl
     finally:
         client.tools.delete_mcp_server(mcp_server_name=mcp_server_name)
         assert mcp_server_name not in client.tools.list_mcp_servers()
+
+
+@pytest.mark.asyncio
+async def test_mcp_server_patch_updates_url(client, server_url):
+    """
+    Test that PATCHing an MCP server actually updates the server URL.
+    """
+    # Create a unique server name
+    mcp_server_name = f"test_patch_{uuid.uuid4().hex[:6]}"
+    original_url = "https://mcp.deepwiki.com/sse"
+    updated_url = "https://mcp2.deepwiki.com/sse"  # Intentionally invalid URL
+
+    # Create the initial SSE MCP server
+    sse_config = SSEServerConfig(server_name=mcp_server_name, server_url=original_url)
+
+    try:
+        # Add the MCP server
+        client.tools.add_mcp_server(request=sse_config)
+
+        # Verify the server was created with correct URL
+        servers = client.tools.list_mcp_servers()
+        assert mcp_server_name in servers
+        assert servers[mcp_server_name].server_url == original_url
+        print(f"✓ Server created with URL: {original_url}")
+
+        # Import the update schema
+        from letta.schemas.mcp import UpdateSSEMCPServer
+
+        # Now PATCH the server to update ONLY the URL (partial update)
+        update_request = UpdateSSEMCPServer(server_url=updated_url)
+        # Note: We're only setting server_url, not server_name
+        print(f"Updating server with request: {update_request.model_dump(exclude_unset=True)}")
+
+        updated_server = client.tools.update_mcp_server(mcp_server_name=mcp_server_name, request=update_request)
+
+        # Verify the server URL was actually updated
+        print(f"Server after update: URL={updated_server.server_url}")
+        assert updated_server.server_url == updated_url, f"Server URL not updated. Expected {updated_url}, got {updated_server.server_url}"
+
+        # Also verify through the list endpoint
+        servers = client.tools.list_mcp_servers()
+        assert mcp_server_name in servers
+        assert servers[mcp_server_name].server_url == updated_url, (
+            f"Server URL not updated in list. Got: {servers[mcp_server_name].server_url}"
+        )
+        print(f"✓ Server URL successfully updated to: {updated_url}")
+
+        # Now try to list tools with the updated (invalid) URL
+        # This should fail or return empty list if the patch actually worked
+        try:
+            tools = client.tools.list_mcp_tools_by_server(mcp_server_name=mcp_server_name)
+            # If we get here, either the tools listing succeeded (shouldn't with invalid URL)
+            # or it returned an empty list
+            assert len(tools) == 0, f"Expected no tools from invalid URL {updated_url}, but got {len(tools)} tools"
+            print("✓ Invalid URL correctly returns no tools")
+        except Exception:
+            # This is expected - the invalid URL should cause an error
+            # which confirms the PATCH actually updated the URL
+            print("✓ Invalid URL correctly causes error when listing tools")
+
+    finally:
+        try:
+            client.tools.delete_mcp_server(mcp_server_name=mcp_server_name)
+        except Exception:
+            pass