feat(prompts): adding better prompts & restoring tool_stop

Mistral's models seem to do something really strange if you allow for
`tool_choice` to be anything but `any`. They start putting the tool call
inside the `content` instead of an actual tool call. This means that I
need this `stop` mechanism using a tool call instead because I cannot
trust the model to do it by itself.

I quite like this model though, it's cheap, it's fast and it's open
source. And all the answers are pretty good!

backend/agents/client/chat.go

@@ -194,7 +194,7 @@ func (chat *Chat) AddImage(imageName string, image []byte, query *string) error
 
 	contentLength := 1
 	if query != nil {
-		contentLength = 2
+		contentLength += 1
 	}
 
 	messageContent := ArrayMessage{

backend/agents/client/client.go

@@ -160,7 +160,8 @@ func (client AgentClient) Request(req *AgentRequestBody) (AgentResponse, error)
 		return AgentResponse{}, errors.New("Unsupported. We currently only accept 1 choice from AI.")
 	}
 
-	req.Chat.AddAiResponse(agentResponse.Choices[0].Message)
+	msg := agentResponse.Choices[0].Message
+	req.Chat.AddAiResponse(msg)
 
 	return agentResponse, nil
 }
@@ -178,7 +179,13 @@ func (client *AgentClient) ToolLoop(info ToolHandlerInfo, req *AgentRequestBody)
 		}
 
 		err = client.Process(info, req)
+
 		if err != nil {
+
+			if err == FinishedCall {
+				client.Log.Debug("Agent is finished")
+			}
+
 			return err
 		}
 	}
@@ -230,7 +237,7 @@ func (client *AgentClient) RunAgent(userId uuid.UUID, imageId uuid.UUID, imageNa
 		panic(err)
 	}
 
-	toolChoice := "auto"
+	toolChoice := "any"
 
 	request := AgentRequestBody{
 		Tools:       &tools,