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sequenceDiagram
    participant UI as ๐Ÿงฉ ChatForm / ChatMessage
    participant chatStore as ๐Ÿ—„๏ธ chatStore
    participant agenticStore as ๐Ÿ—„๏ธ agenticStore
    participant convStore as ๐Ÿ—„๏ธ conversationsStore
    participant settingsStore as ๐Ÿ—„๏ธ settingsStore
    participant mcpStore as ๐Ÿ—„๏ธ mcpStore
    participant ChatSvc as โš™๏ธ ChatService
    participant DbSvc as โš™๏ธ DatabaseService
    participant API as ๐ŸŒ /v1/chat/completions

    Note over chatStore: State:<br/>isLoading, currentResponse<br/>errorDialogState, activeProcessingState<br/>chatLoadingStates (Map)<br/>chatStreamingStates (Map)<br/>abortControllers (Map)<br/>processingStates (Map)

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: ๐Ÿ’ฌ SEND MESSAGE
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    UI->>chatStore: sendMessage(content, extras)
    activate chatStore

    chatStore->>chatStore: setChatLoading(convId, true)
    chatStore->>chatStore: clearChatStreaming(convId)

    alt no active conversation
        chatStore->>convStore: createConversation()
        Note over convStore: โ†’ see conversations-flow.mmd
    end

    chatStore->>mcpStore: consumeResourceAttachmentsAsExtras()
    Note right of mcpStore: Converts pending MCP resource<br/>attachments into message extras

    chatStore->>chatStore: addMessage("user", content, extras)
    chatStore->>DbSvc: createMessageBranch(userMsg, parentId)
    chatStore->>convStore: addMessageToActive(userMsg)
    chatStore->>convStore: updateCurrentNode(userMsg.id)

    chatStore->>chatStore: createAssistantMessage(userMsg.id)
    chatStore->>DbSvc: createMessageBranch(assistantMsg, userMsg.id)
    chatStore->>convStore: addMessageToActive(assistantMsg)

    chatStore->>chatStore: streamChatCompletion(messages, assistantMsg)
    deactivate chatStore

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: ๐ŸŒŠ STREAMING (with agentic flow detection)
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    activate chatStore
    chatStore->>chatStore: startStreaming()
    Note right of chatStore: isStreamingActive = true

    chatStore->>chatStore: setActiveProcessingConversation(convId)
    chatStore->>chatStore: getOrCreateAbortController(convId)
    Note right of chatStore: abortControllers.set(convId, new AbortController())

    chatStore->>chatStore: getApiOptions()
    Note right of chatStore: Merge from settingsStore.config:<br/>temperature, max_tokens, top_p, etc.

    alt agenticConfig.enabled && mcpStore has connected servers
        chatStore->>agenticStore: runAgenticFlow(convId, messages, assistantMsg, options, signal)
        Note over agenticStore: Multi-turn agentic loop:<br/>1. Call ChatService.sendMessage()<br/>2. If response has tool_calls โ†’ execute via mcpStore<br/>3. Append tool results as messages<br/>4. Loop until no more tool_calls or maxTurns<br/>โ†’ see agentic flow details below
        agenticStore-->>chatStore: final response with timings
    else standard (non-agentic) flow
        chatStore->>ChatSvc: sendMessage(messages, options, signal)
    end

    activate ChatSvc

    ChatSvc->>ChatSvc: convertDbMessageToApiChatMessageData(messages)
    Note right of ChatSvc: DatabaseMessage[] โ†’ ApiChatMessageData[]<br/>Process attachments (images, PDFs, audio)

    ChatSvc->>API: POST /v1/chat/completions
    Note right of API: {messages, model?, stream: true, ...params}

    loop SSE chunks
        API-->>ChatSvc: data: {"choices":[{"delta":{...}}]}
        ChatSvc->>ChatSvc: handleStreamResponse(response)

        alt content chunk
            ChatSvc-->>chatStore: onChunk(content)
            chatStore->>chatStore: setChatStreaming(convId, response, msgId)
            Note right of chatStore: currentResponse = $state(accumulated)
            chatStore->>convStore: updateMessageAtIndex(idx, {content})
        end

        alt reasoning chunk
            ChatSvc-->>chatStore: onReasoningChunk(reasoning)
            chatStore->>convStore: updateMessageAtIndex(idx, {thinking})
        end

        alt tool_calls chunk
            ChatSvc-->>chatStore: onToolCallChunk(toolCalls)
            chatStore->>convStore: updateMessageAtIndex(idx, {toolCalls})
        end

        alt model info
            ChatSvc-->>chatStore: onModel(modelName)
            chatStore->>chatStore: recordModel(modelName)
            chatStore->>DbSvc: updateMessage(msgId, {model})
        end

        alt timings (during stream)
            ChatSvc-->>chatStore: onTimings(timings, promptProgress)
            chatStore->>chatStore: updateProcessingStateFromTimings()
        end

        chatStore-->>UI: reactive $state update
    end

    API-->>ChatSvc: data: [DONE]
    ChatSvc-->>chatStore: onComplete(content, reasoning, timings, toolCalls)
    deactivate ChatSvc

    chatStore->>chatStore: stopStreaming()
    chatStore->>DbSvc: updateMessage(msgId, {content, timings, model})
    chatStore->>convStore: updateCurrentNode(msgId)
    chatStore->>chatStore: setChatLoading(convId, false)
    chatStore->>chatStore: clearChatStreaming(convId)
    chatStore->>chatStore: clearProcessingState(convId)
    deactivate chatStore

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: โน๏ธ STOP GENERATION
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    UI->>chatStore: stopGeneration()
    activate chatStore
    chatStore->>chatStore: savePartialResponseIfNeeded(convId)
    Note right of chatStore: Save currentResponse to DB if non-empty
    chatStore->>chatStore: abortControllers.get(convId).abort()
    Note right of chatStore: fetch throws AbortError โ†’ caught by isAbortError()
    chatStore->>chatStore: stopStreaming()
    chatStore->>chatStore: setChatLoading(convId, false)
    chatStore->>chatStore: clearChatStreaming(convId)
    chatStore->>chatStore: clearProcessingState(convId)
    deactivate chatStore

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: ๐Ÿ” REGENERATE
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    UI->>chatStore: regenerateMessageWithBranching(msgId, model?)
    activate chatStore
    chatStore->>convStore: findMessageIndex(msgId)
    chatStore->>chatStore: Get parent of target message
    chatStore->>chatStore: createAssistantMessage(parentId)
    chatStore->>DbSvc: createMessageBranch(newAssistantMsg, parentId)
    chatStore->>convStore: refreshActiveMessages()
    Note right of chatStore: Same streaming flow
    chatStore->>chatStore: streamChatCompletion(...)
    deactivate chatStore

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: โžก๏ธ CONTINUE
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    UI->>chatStore: continueAssistantMessage(msgId)
    activate chatStore
    chatStore->>chatStore: Get existing content from message
    chatStore->>chatStore: streamChatCompletion(..., existingContent)
    Note right of chatStore: Appends to existing message content
    deactivate chatStore

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: โœ๏ธ EDIT USER MESSAGE
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    UI->>chatStore: editMessageWithBranching(msgId, newContent, extras)
    activate chatStore
    chatStore->>chatStore: Get parent of target message
    chatStore->>DbSvc: createMessageBranch(editedMsg, parentId)
    chatStore->>convStore: refreshActiveMessages()
    Note right of chatStore: Creates new branch, original preserved
    chatStore->>chatStore: createAssistantMessage(editedMsg.id)
    chatStore->>chatStore: streamChatCompletion(...)
    Note right of chatStore: Automatically regenerates response
    deactivate chatStore

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: โŒ ERROR HANDLING
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    Note over chatStore: On stream error (non-abort):
    chatStore->>chatStore: showErrorDialog(type, message)
    Note right of chatStore: errorDialogState = {type: 'timeout'|'server', message}
    chatStore->>convStore: removeMessageAtIndex(failedMsgIdx)
    chatStore->>DbSvc: deleteMessage(failedMsgId)

    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
    Note over UI,API: ๐Ÿค– AGENTIC LOOP (when agenticConfig.enabled)
    %% โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•

    Note over agenticStore: agenticStore.runAgenticFlow(convId, messages, assistantMsg, options, signal)
    activate agenticStore
    agenticStore->>agenticStore: getSession(convId) or create new
    agenticStore->>agenticStore: updateSession(turn: 0, running: true)

    loop executeAgenticLoop (until no tool_calls or maxTurns)
        agenticStore->>agenticStore: turn++
        agenticStore->>ChatSvc: sendMessage(messages, options, signal)
        ChatSvc->>API: POST /v1/chat/completions
        API-->>ChatSvc: response with potential tool_calls
        ChatSvc-->>agenticStore: onComplete(content, reasoning, timings, toolCalls)

        alt response has tool_calls
            agenticStore->>agenticStore: normalizeToolCalls(toolCalls)
            loop for each tool_call
                agenticStore->>agenticStore: updateSession(streamingToolCall)
                agenticStore->>mcpStore: executeTool(mcpCall, signal)
                mcpStore-->>agenticStore: tool result
                agenticStore->>agenticStore: extractBase64Attachments(result)
                agenticStore->>agenticStore: emitToolCallResult(convId, ...)
                agenticStore->>convStore: addMessageToActive(toolResultMsg)
                agenticStore->>DbSvc: createMessageBranch(toolResultMsg)
            end
            agenticStore->>agenticStore: Create new assistantMsg for next turn
            Note right of agenticStore: Continue loop with updated messages
        else no tool_calls (final response)
            agenticStore->>agenticStore: buildFinalTimings(allTurns)
            Note right of agenticStore: Break loop, return final response
        end
    end

    agenticStore->>agenticStore: updateSession(running: false)
    agenticStore-->>chatStore: final content, timings, model
    deactivate agenticStore

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