Using string for CreatedAt instead of Time

Signed-off-by: Trung Nguyen <trungutt@users.noreply.github.com>

Author: trungutt

cmd/root/run.go

@@ -578,7 +578,7 @@ func createUserMessageWithAttachment(agentFilename, userContent, attachmentPath
 		Message: chat.Message{
 			Role:         chat.MessageRoleUser,
 			MultiContent: multiContent,
-			CreatedAt:    time.Now(),
+			CreatedAt:    time.Now().Format(time.RFC3339),
 		},
 	}
 }

pkg/chat/chat.go

@@ -1,8 +1,6 @@
 package chat
 
 import (
-	"time"
-
 	"github.com/docker/cagent/pkg/tools"
 )
 
@@ -61,7 +59,8 @@ type Message struct {
 	// For Role=tool prompts this should be set to the ID given in the assistant's prior request to call a tool.
 	ToolCallID string `json:"tool_call_id,omitempty"`
 
-	CreatedAt time.Time `json:"created_at"`
+	// CreatedAt is the time the message was created
+	CreatedAt string `json:"created_at,omitempty"`
 }
 
 type MessagePart struct {

pkg/runtime/runtime.go

@@ -224,7 +224,7 @@ func (r *Runtime) RunStream(ctx context.Context, sess *session.Session) <-chan E
 				Role:      chat.MessageRoleAssistant,
 				Content:   content,
 				ToolCalls: calls,
-				CreatedAt: time.Now(),
+				CreatedAt: time.Now().Format(time.RFC3339),
 			}
 
 			sess.AddMessage(session.NewAgentMessage(a, &assistantMessage))
@@ -546,7 +546,7 @@ func (r *Runtime) runTool(ctx context.Context, tool tools.Tool, toolCall tools.T
 		Role:       chat.MessageRoleTool,
 		Content:    res.Output,
 		ToolCallID: toolCall.ID,
-		CreatedAt:  time.Now(),
+		CreatedAt:  time.Now().Format(time.RFC3339),
 	}
 	sess.AddMessage(session.NewAgentMessage(a, &toolResponseMsg))
 }
@@ -587,7 +587,7 @@ func (r *Runtime) runAgentTool(ctx context.Context, handler ToolHandler, sess *s
 		Role:       chat.MessageRoleTool,
 		Content:    output,
 		ToolCallID: toolCall.ID,
-		CreatedAt:  time.Now(),
+		CreatedAt:  time.Now().Format(time.RFC3339),
 	}
 	sess.AddMessage(session.NewAgentMessage(a, &toolResponseMsg))
 }
@@ -618,7 +618,7 @@ func (r *Runtime) addToolCancelledResponse(sess *session.Session, toolCall tools
 		Role:       chat.MessageRoleTool,
 		Content:    result,
 		ToolCallID: toolCall.ID,
-		CreatedAt:  time.Now(),
+		CreatedAt:  time.Now().Format(time.RFC3339),
 	}
 	sess.AddMessage(session.NewAgentMessage(a, &toolResponseMsg))
 }

pkg/session/session.go

@@ -76,7 +76,7 @@ func UserMessage(agentFilename, content string) *Message {
 		Message: chat.Message{
 			Role:      chat.MessageRoleUser,
 			Content:   content,
-			CreatedAt: time.Now(),
+			CreatedAt: time.Now().Format(time.RFC3339),
 		},
 	}
 }
@@ -96,7 +96,7 @@ func SystemMessage(content string) *Message {
 		Message: chat.Message{
 			Role:      chat.MessageRoleSystem,
 			Content:   content,
-			CreatedAt: time.Now(),
+			CreatedAt: time.Now().Format(time.RFC3339),
 		},
 	}
 }
@@ -203,7 +203,7 @@ func (s *Session) GetMessages(a *agent.Agent) []chat.Message {
 		messages = append(messages, chat.Message{
 			Role:      "system",
 			Content:   "You are a multi-agent system, make sure to answer the user query in the most helpful way possible. You have access to these sub-agents:\n" + subAgentsStr + "\nIMPORTANT: You can ONLY transfer tasks to the agents listed above using their ID. The valid agent IDs are: " + strings.Join(validAgentIDs, ", ") + ". You MUST NOT attempt to transfer to any other agent IDs - doing so will cause system errors.\n\nIf you are the best to answer the question according to your description, you can answer it.\n\nIf another agent is better for answering the question according to its description, call `transfer_task` function to transfer the question to that agent using the agent's ID. When transferring, do not generate any text other than the function call.\n\n",
-			CreatedAt: time.Now(),
+			CreatedAt: time.Now().Format(time.RFC3339),
 		})
 	}
 
@@ -215,15 +215,15 @@ func (s *Session) GetMessages(a *agent.Agent) []chat.Message {
 	messages = append(messages, chat.Message{
 		Role:      chat.MessageRoleSystem,
 		Content:   a.Instruction() + "\n\n" + date,
-		CreatedAt: time.Now(),
+		CreatedAt: time.Now().Format(time.RFC3339),
 	})
 
 	for _, tool := range a.ToolSets() {
 		if tool.Instructions() != "" {
 			messages = append(messages, chat.Message{
 				Role:      chat.MessageRoleSystem,
 				Content:   tool.Instructions(),
-				CreatedAt: time.Now(),
+				CreatedAt: time.Now().Format(time.RFC3339),
 			})
 		}
 	}
@@ -240,7 +240,7 @@ func (s *Session) GetMessages(a *agent.Agent) []chat.Message {
 		messages = append(messages, chat.Message{
 			Role:      chat.MessageRoleSystem,
 			Content:   "Session Summary: " + s.Messages[lastSummaryIndex].Summary,
-			CreatedAt: time.Now(),
+			CreatedAt: time.Now().Format(time.RFC3339),
 		})
 	}