Context Window Warning (#152)

* context window warning & compact command

* auto compact

* fix permissions

* update readme

* fix 3.5 context window

* small update

* remove unused interface

* remove unused msg

README.md

@@ -62,12 +62,29 @@ OpenCode looks for configuration in the following locations:
 - `$XDG_CONFIG_HOME/opencode/.opencode.json`
 - `./.opencode.json` (local directory)
 
+### Auto Compact Feature
+
+OpenCode includes an auto compact feature that automatically summarizes your conversation when it approaches the model's context window limit. When enabled (default setting), this feature:
+
+- Monitors token usage during your conversation
+- Automatically triggers summarization when usage reaches 95% of the model's context window
+- Creates a new session with the summary, allowing you to continue your work without losing context
+- Helps prevent "out of context" errors that can occur with long conversations
+
+You can enable or disable this feature in your configuration file:
+
+```json
+{
+  "autoCompact": true // default is true
+}
+```
+
 ### Environment Variables
 
 You can configure OpenCode using environment variables:
 
 | Environment Variable       | Purpose                                                |
-|----------------------------|--------------------------------------------------------|
+| -------------------------- | ------------------------------------------------------ |
 | `ANTHROPIC_API_KEY`        | For Claude models                                      |
 | `OPENAI_API_KEY`           | For OpenAI models                                      |
 | `GEMINI_API_KEY`           | For Google Gemini models                               |
@@ -79,7 +96,6 @@ You can configure OpenCode using environment variables:
 | `AZURE_OPENAI_API_KEY`     | For Azure OpenAI models (optional when using Entra ID) |
 | `AZURE_OPENAI_API_VERSION` | For Azure OpenAI models                                |
 
-
 ### Configuration File Structure
 
 ```json
@@ -134,7 +150,8 @@ You can configure OpenCode using environment variables:
     }
   },
   "debug": false,
-  "debugLSP": false
+  "debugLSP": false,
+  "autoCompact": true
 }
 ```
 
@@ -327,9 +344,11 @@ OpenCode supports custom commands that can be created by users to quickly send p
 Custom commands are predefined prompts stored as Markdown files in one of three locations:
 
 1. **User Commands** (prefixed with `user:`):
+
    ```
    $XDG_CONFIG_HOME/opencode/commands/
    ```
+
    (typically `~/.config/opencode/commands/` on Linux/macOS)
 
    or
@@ -382,6 +401,15 @@ This creates a command with ID `user:git:commit`.
 
 The content of the command file will be sent as a message to the AI assistant.
 
+### Built-in Commands
+
+OpenCode includes several built-in commands:
+
+| Command            | Description                                                                                         |
+| ------------------ | --------------------------------------------------------------------------------------------------- |
+| Initialize Project | Creates or updates the OpenCode.md memory file with project-specific information                    |
+| Compact Session    | Manually triggers the summarization of the current session, creating a new session with the summary |
+
 ## MCP (Model Context Protocol)
 
 OpenCode implements the Model Context Protocol (MCP) to extend its capabilities through external tools. MCP provides a standardized way for the AI assistant to interact with external services and tools.

cmd/root.go

@@ -218,6 +218,7 @@ func setupSubscriptions(app *app.App, parentCtx context.Context) (chan tea.Msg,
 	setupSubscriber(ctx, &wg, "sessions", app.Sessions.Subscribe, ch)
 	setupSubscriber(ctx, &wg, "messages", app.Messages.Subscribe, ch)
 	setupSubscriber(ctx, &wg, "permissions", app.Permissions.Subscribe, ch)
+	setupSubscriber(ctx, &wg, "coderAgent", app.CoderAgent.Subscribe, ch)
 
 	cleanupFunc := func() {
 		logging.Info("Cancelling all subscriptions")

internal/config/config.go

@@ -36,9 +36,10 @@ type MCPServer struct {
 type AgentName string
 
 const (
-	AgentCoder AgentName = "coder"
+	AgentCoder      AgentName = "coder"
-	AgentTask  AgentName = "task"
+	AgentSummarizer AgentName = "summarizer"
-	AgentTitle AgentName = "title"
+	AgentTask       AgentName = "task"
+	AgentTitle      AgentName = "title"
 )
 
 // Agent defines configuration for different LLM models and their token limits.
@@ -84,6 +85,7 @@ type Config struct {
 	DebugLSP     bool                              `json:"debugLSP,omitempty"`
 	ContextPaths []string                          `json:"contextPaths,omitempty"`
 	TUI          TUIConfig                         `json:"tui"`
+	AutoCompact  bool                              `json:"autoCompact,omitempty"`
 }
 
 // Application constants
@@ -213,6 +215,7 @@ func setDefaults(debug bool) {
 	viper.SetDefault("data.directory", defaultDataDirectory)
 	viper.SetDefault("contextPaths", defaultContextPaths)
 	viper.SetDefault("tui.theme", "opencode")
+	viper.SetDefault("autoCompact", true)
 
 	if debug {
 		viper.SetDefault("debug", true)
@@ -262,6 +265,7 @@ func setProviderDefaults() {
 	// Anthropic configuration
 	if key := viper.GetString("providers.anthropic.apiKey"); strings.TrimSpace(key) != "" {
 		viper.SetDefault("agents.coder.model", models.Claude37Sonnet)
+		viper.SetDefault("agents.summarizer.model", models.Claude37Sonnet)
 		viper.SetDefault("agents.task.model", models.Claude37Sonnet)
 		viper.SetDefault("agents.title.model", models.Claude37Sonnet)
 		return
@@ -270,6 +274,7 @@ func setProviderDefaults() {
 	// OpenAI configuration
 	if key := viper.GetString("providers.openai.apiKey"); strings.TrimSpace(key) != "" {
 		viper.SetDefault("agents.coder.model", models.GPT41)
+		viper.SetDefault("agents.summarizer.model", models.GPT41)
 		viper.SetDefault("agents.task.model", models.GPT41Mini)
 		viper.SetDefault("agents.title.model", models.GPT41Mini)
 		return
@@ -278,6 +283,7 @@ func setProviderDefaults() {
 	// Google Gemini configuration
 	if key := viper.GetString("providers.gemini.apiKey"); strings.TrimSpace(key) != "" {
 		viper.SetDefault("agents.coder.model", models.Gemini25)
+		viper.SetDefault("agents.summarizer.model", models.Gemini25)
 		viper.SetDefault("agents.task.model", models.Gemini25Flash)
 		viper.SetDefault("agents.title.model", models.Gemini25Flash)
 		return
@@ -286,6 +292,7 @@ func setProviderDefaults() {
 	// Groq configuration
 	if key := viper.GetString("providers.groq.apiKey"); strings.TrimSpace(key) != "" {
 		viper.SetDefault("agents.coder.model", models.QWENQwq)
+		viper.SetDefault("agents.summarizer.model", models.QWENQwq)
 		viper.SetDefault("agents.task.model", models.QWENQwq)
 		viper.SetDefault("agents.title.model", models.QWENQwq)
 		return
@@ -294,6 +301,7 @@ func setProviderDefaults() {
 	// OpenRouter configuration
 	if key := viper.GetString("providers.openrouter.apiKey"); strings.TrimSpace(key) != "" {
 		viper.SetDefault("agents.coder.model", models.OpenRouterClaude37Sonnet)
+		viper.SetDefault("agents.summarizer.model", models.OpenRouterClaude37Sonnet)
 		viper.SetDefault("agents.task.model", models.OpenRouterClaude37Sonnet)
 		viper.SetDefault("agents.title.model", models.OpenRouterClaude35Haiku)
 		return
@@ -302,6 +310,7 @@ func setProviderDefaults() {
 	// XAI configuration
 	if key := viper.GetString("providers.xai.apiKey"); strings.TrimSpace(key) != "" {
 		viper.SetDefault("agents.coder.model", models.XAIGrok3Beta)
+		viper.SetDefault("agents.summarizer.model", models.XAIGrok3Beta)
 		viper.SetDefault("agents.task.model", models.XAIGrok3Beta)
 		viper.SetDefault("agents.title.model", models.XAiGrok3MiniFastBeta)
 		return
@@ -310,6 +319,7 @@ func setProviderDefaults() {
 	// AWS Bedrock configuration
 	if hasAWSCredentials() {
 		viper.SetDefault("agents.coder.model", models.BedrockClaude37Sonnet)
+		viper.SetDefault("agents.summarizer.model", models.BedrockClaude37Sonnet)
 		viper.SetDefault("agents.task.model", models.BedrockClaude37Sonnet)
 		viper.SetDefault("agents.title.model", models.BedrockClaude37Sonnet)
 		return
@@ -318,6 +328,7 @@ func setProviderDefaults() {
 	// Azure OpenAI configuration
 	if os.Getenv("AZURE_OPENAI_ENDPOINT") != "" {
 		viper.SetDefault("agents.coder.model", models.AzureGPT41)
+		viper.SetDefault("agents.summarizer.model", models.AzureGPT41)
 		viper.SetDefault("agents.task.model", models.AzureGPT41Mini)
 		viper.SetDefault("agents.title.model", models.AzureGPT41Mini)
 		return

internal/llm/agent/agent-tool.go

@@ -69,11 +69,11 @@ func (b *agentTool) Run(ctx context.Context, call tools.ToolCall) (tools.ToolRes
 		return tools.ToolResponse{}, fmt.Errorf("error generating agent: %s", err)
 	}
 	result := <-done
-	if result.Err() != nil {
+	if result.Error != nil {
-		return tools.ToolResponse{}, fmt.Errorf("error generating agent: %s", result.Err())
+		return tools.ToolResponse{}, fmt.Errorf("error generating agent: %s", result.Error)
 	}
 
-	response := result.Response()
+	response := result.Message
 	if response.Role != message.Assistant {
 		return tools.NewTextErrorResponse("no response"), nil
 	}
@@ -88,8 +88,6 @@ func (b *agentTool) Run(ctx context.Context, call tools.ToolCall) (tools.ToolRes
 	}
 
 	parentSession.Cost += updatedSession.Cost
-	parentSession.PromptTokens += updatedSession.PromptTokens
-	parentSession.CompletionTokens += updatedSession.CompletionTokens
 
 	_, err = b.sessions.Save(ctx, parentSession)
 	if err != nil {

internal/llm/agent/agent.go

@@ -15,6 +15,7 @@ import (
 	"github.com/opencode-ai/opencode/internal/logging"
 	"github.com/opencode-ai/opencode/internal/message"
 	"github.com/opencode-ai/opencode/internal/permission"
+	"github.com/opencode-ai/opencode/internal/pubsub"
 	"github.com/opencode-ai/opencode/internal/session"
 )
 
@@ -24,35 +25,46 @@ var (
 	ErrSessionBusy      = errors.New("session is currently processing another request")
 )
 
+type AgentEventType string
+
+const (
+	AgentEventTypeError     AgentEventType = "error"
+	AgentEventTypeResponse  AgentEventType = "response"
+	AgentEventTypeSummarize AgentEventType = "summarize"
+)
+
 type AgentEvent struct {
-	message message.Message
+	Type    AgentEventType
-	err     error
+	Message message.Message
-}
+	Error   error
 
-func (e *AgentEvent) Err() error {
+	// When summarizing
-	return e.err
+	SessionID string
-}
+	Progress  string
-
+	Done      bool
-func (e *AgentEvent) Response() message.Message {
-	return e.message
 }
 
 type Service interface {
+	pubsub.Suscriber[AgentEvent]
+	Model() models.Model
 	Run(ctx context.Context, sessionID string, content string, attachments ...message.Attachment) (<-chan AgentEvent, error)
 	Cancel(sessionID string)
 	IsSessionBusy(sessionID string) bool
 	IsBusy() bool
 	Update(agentName config.AgentName, modelID models.ModelID) (models.Model, error)
+	Summarize(ctx context.Context, sessionID string) error
 }
 
 type agent struct {
+	*pubsub.Broker[AgentEvent]
 	sessions session.Service
 	messages message.Service
 
 	tools    []tools.BaseTool
 	provider provider.Provider
 
-	titleProvider provider.Provider
+	titleProvider     provider.Provider
+	summarizeProvider provider.Provider
 
 	activeRequests sync.Map
 }
@@ -75,26 +87,48 @@ func NewAgent(
 			return nil, err
 		}
 	}
+	var summarizeProvider provider.Provider
+	if agentName == config.AgentCoder {
+		summarizeProvider, err = createAgentProvider(config.AgentSummarizer)
+		if err != nil {
+			return nil, err
+		}
+	}
 
 	agent := &agent{
-		provider:       agentProvider,
+		Broker:            pubsub.NewBroker[AgentEvent](),
-		messages:       messages,
+		provider:          agentProvider,
-		sessions:       sessions,
+		messages:          messages,
-		tools:          agentTools,
+		sessions:          sessions,
-		titleProvider:  titleProvider,
+		tools:             agentTools,
-		activeRequests: sync.Map{},
+		titleProvider:     titleProvider,
+		summarizeProvider: summarizeProvider,
+		activeRequests:    sync.Map{},
 	}
 
 	return agent, nil
 }
 
+func (a *agent) Model() models.Model {
+	return a.provider.Model()
+}
+
 func (a *agent) Cancel(sessionID string) {
+	// Cancel regular requests
 	if cancelFunc, exists := a.activeRequests.LoadAndDelete(sessionID); exists {
 		if cancel, ok := cancelFunc.(context.CancelFunc); ok {
 			logging.InfoPersist(fmt.Sprintf("Request cancellation initiated for session: %s", sessionID))
 			cancel()
 		}
 	}
+
+	// Also check for summarize requests
+	if cancelFunc, exists := a.activeRequests.LoadAndDelete(sessionID + "-summarize"); exists {
+		if cancel, ok := cancelFunc.(context.CancelFunc); ok {
+			logging.InfoPersist(fmt.Sprintf("Summarize cancellation initiated for session: %s", sessionID))
+			cancel()
+		}
+	}
 }
 
 func (a *agent) IsBusy() bool {
@@ -154,7 +188,8 @@ func (a *agent) generateTitle(ctx context.Context, sessionID string, content str
 
 func (a *agent) err(err error) AgentEvent {
 	return AgentEvent{
-		err: err,
+		Type:  AgentEventTypeError,
+		Error: err,
 	}
 }
 
@@ -180,12 +215,13 @@ func (a *agent) Run(ctx context.Context, sessionID string, content string, attac
 			attachmentParts = append(attachmentParts, message.BinaryContent{Path: attachment.FilePath, MIMEType: attachment.MimeType, Data: attachment.Content})
 		}
 		result := a.processGeneration(genCtx, sessionID, content, attachmentParts)
-		if result.Err() != nil && !errors.Is(result.Err(), ErrRequestCancelled) && !errors.Is(result.Err(), context.Canceled) {
+		if result.Error != nil && !errors.Is(result.Error, ErrRequestCancelled) && !errors.Is(result.Error, context.Canceled) {
-			logging.ErrorPersist(result.Err().Error())
+			logging.ErrorPersist(result.Error.Error())
 		}
 		logging.Debug("Request completed", "sessionID", sessionID)
 		a.activeRequests.Delete(sessionID)
 		cancel()
+		a.Publish(pubsub.CreatedEvent, result)
 		events <- result
 		close(events)
 	}()
@@ -241,7 +277,9 @@ func (a *agent) processGeneration(ctx context.Context, sessionID, content string
 			continue
 		}
 		return AgentEvent{
-			message: agentMessage,
+			Type:    AgentEventTypeResponse,
+			Message: agentMessage,
+			Done:    true,
 		}
 	}
 }
@@ -432,8 +470,8 @@ func (a *agent) TrackUsage(ctx context.Context, sessionID string, model models.M
 		model.CostPer1MOut/1e6*float64(usage.OutputTokens)
 
 	sess.Cost += cost
-	sess.CompletionTokens += usage.OutputTokens
+	sess.CompletionTokens = usage.OutputTokens + usage.CacheReadTokens
-	sess.PromptTokens += usage.InputTokens
+	sess.PromptTokens = usage.InputTokens + usage.CacheCreationTokens
 
 	_, err = a.sessions.Save(ctx, sess)
 	if err != nil {
@@ -461,6 +499,162 @@ func (a *agent) Update(agentName config.AgentName, modelID models.ModelID) (mode
 	return a.provider.Model(), nil
 }
 
+func (a *agent) Summarize(ctx context.Context, sessionID string) error {
+	if a.summarizeProvider == nil {
+		return fmt.Errorf("summarize provider not available")
+	}
+
+	// Check if session is busy
+	if a.IsSessionBusy(sessionID) {
+		return ErrSessionBusy
+	}
+
+	// Create a new context with cancellation
+	summarizeCtx, cancel := context.WithCancel(ctx)
+
+	// Store the cancel function in activeRequests to allow cancellation
+	a.activeRequests.Store(sessionID+"-summarize", cancel)
+
+	go func() {
+		defer a.activeRequests.Delete(sessionID + "-summarize")
+		defer cancel()
+		event := AgentEvent{
+			Type:     AgentEventTypeSummarize,
+			Progress: "Starting summarization...",
+		}
+
+		a.Publish(pubsub.CreatedEvent, event)
+		// Get all messages from the session
+		msgs, err := a.messages.List(summarizeCtx, sessionID)
+		if err != nil {
+			event = AgentEvent{
+				Type:  AgentEventTypeError,
+				Error: fmt.Errorf("failed to list messages: %w", err),
+				Done:  true,
+			}
+			a.Publish(pubsub.CreatedEvent, event)
+			return
+		}
+
+		if len(msgs) == 0 {
+			event = AgentEvent{
+				Type:  AgentEventTypeError,
+				Error: fmt.Errorf("no messages to summarize"),
+				Done:  true,
+			}
+			a.Publish(pubsub.CreatedEvent, event)
+			return
+		}
+
+		event = AgentEvent{
+			Type:     AgentEventTypeSummarize,
+			Progress: "Analyzing conversation...",
+		}
+		a.Publish(pubsub.CreatedEvent, event)
+
+		// Add a system message to guide the summarization
+		summarizePrompt := "Provide a detailed but concise summary of our conversation above. Focus on information that would be helpful for continuing the conversation, including what we did, what we're doing, which files we're working on, and what we're going to do next."
+
+		// Create a new message with the summarize prompt
+		promptMsg := message.Message{
+			Role:  message.User,
+			Parts: []message.ContentPart{message.TextContent{Text: summarizePrompt}},
+		}
+
+		// Append the prompt to the messages
+		msgsWithPrompt := append(msgs, promptMsg)
+
+		event = AgentEvent{
+			Type:     AgentEventTypeSummarize,
+			Progress: "Generating summary...",
+		}
+
+		a.Publish(pubsub.CreatedEvent, event)
+
+		// Send the messages to the summarize provider
+		response, err := a.summarizeProvider.SendMessages(
+			summarizeCtx,
+			msgsWithPrompt,
+			make([]tools.BaseTool, 0),
+		)
+		if err != nil {
+			event = AgentEvent{
+				Type:  AgentEventTypeError,
+				Error: fmt.Errorf("failed to summarize: %w", err),
+				Done:  true,
+			}
+			a.Publish(pubsub.CreatedEvent, event)
+			return
+		}
+
+		summary := strings.TrimSpace(response.Content)
+		if summary == "" {
+			event = AgentEvent{
+				Type:  AgentEventTypeError,
+				Error: fmt.Errorf("empty summary returned"),
+				Done:  true,
+			}
+			a.Publish(pubsub.CreatedEvent, event)
+			return
+		}
+		event = AgentEvent{
+			Type:     AgentEventTypeSummarize,
+			Progress: "Creating new session...",
+		}
+
+		a.Publish(pubsub.CreatedEvent, event)
+		oldSession, err := a.sessions.Get(summarizeCtx, sessionID)
+		if err != nil {
+			event = AgentEvent{
+				Type:  AgentEventTypeError,
+				Error: fmt.Errorf("failed to get session: %w", err),
+				Done:  true,
+			}
+
+			a.Publish(pubsub.CreatedEvent, event)
+			return
+		}
+		// Create a new session with the summary
+		newSession, err := a.sessions.Create(summarizeCtx, oldSession.Title+" - Continuation")
+		if err != nil {
+			event = AgentEvent{
+				Type:  AgentEventTypeError,
+				Error: fmt.Errorf("failed to create new session: %w", err),
+				Done:  true,
+			}
+			a.Publish(pubsub.CreatedEvent, event)
+			return
+		}
+
+		// Create a message in the new session with the summary
+		_, err = a.messages.Create(summarizeCtx, newSession.ID, message.CreateMessageParams{
+			Role:  message.Assistant,
+			Parts: []message.ContentPart{message.TextContent{Text: summary}},
+			Model: a.summarizeProvider.Model().ID,
+		})
+		if err != nil {
+			event = AgentEvent{
+				Type:  AgentEventTypeError,
+				Error: fmt.Errorf("failed to create summary message: %w", err),
+				Done:  true,
+			}
+
+			a.Publish(pubsub.CreatedEvent, event)
+			return
+		}
+		event = AgentEvent{
+			Type:      AgentEventTypeSummarize,
+			SessionID: newSession.ID,
+			Progress:  "Summary complete",
+			Done:      true,
+		}
+		a.Publish(pubsub.CreatedEvent, event)
+		// Send final success event with the new session ID
+	}()
+
+	return nil
+}
+
 func createAgentProvider(agentName config.AgentName) (provider.Provider, error) {
 	cfg := config.Get()
 	agentConfig, ok := cfg.Agents[agentName]

internal/llm/prompt/prompt.go

@@ -21,6 +21,8 @@ func GetAgentPrompt(agentName config.AgentName, provider models.ModelProvider) s
 		basePrompt = TitlePrompt(provider)
 	case config.AgentTask:
 		basePrompt = TaskPrompt(provider)
+	case config.AgentSummarizer:
+		basePrompt = SummarizerPrompt(provider)
 	default:
 		basePrompt = "You are a helpful assistant"
 	}

internal/llm/prompt/summarizer.go

@@ -0,0 +1,16 @@
+package prompt
+
+import "github.com/opencode-ai/opencode/internal/llm/models"
+
+func SummarizerPrompt(_ models.ModelProvider) string {
+	return `You are a helpful AI assistant tasked with summarizing conversations.
+
+When asked to summarize, provide a detailed but concise summary of the conversation. 
+Focus on information that would be helpful for continuing the conversation, including:
+- What was done
+- What is currently being worked on
+- Which files are being modified
+- What needs to be done next
+
+Your summary should be comprehensive enough to provide context but concise enough to be quickly understood.`
+}

internal/tui/components/core/status.go

@@ -21,7 +21,6 @@ import (
 
 type StatusCmp interface {
 	tea.Model
-	SetHelpWidgetMsg(string)
 }
 
 type statusCmp struct {
@@ -74,11 +73,9 @@ func (m statusCmp) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 var helpWidget = ""
 
 // getHelpWidget returns the help widget with current theme colors
-func getHelpWidget(helpText string) string {
+func getHelpWidget() string {
 	t := theme.CurrentTheme()
-	if helpText == "" {
+	helpText := "ctrl+? help"
-		helpText = "ctrl+? help"
-	}
 
 	return styles.Padded().
 		Background(t.TextMuted()).
@@ -87,7 +84,7 @@ func getHelpWidget(helpText string) string {
 		Render(helpText)
 }
 
-func formatTokensAndCost(tokens int64, cost float64) string {
+func formatTokensAndCost(tokens, contextWindow int64, cost float64) string {
 	// Format tokens in human-readable format (e.g., 110K, 1.2M)
 	var formattedTokens string
 	switch {
@@ -110,32 +107,48 @@ func formatTokensAndCost(tokens int64, cost float64) string {
 	// Format cost with $ symbol and 2 decimal places
 	formattedCost := fmt.Sprintf("$%.2f", cost)
 
-	return fmt.Sprintf("Tokens: %s, Cost: %s", formattedTokens, formattedCost)
+	percentage := (float64(tokens) / float64(contextWindow)) * 100
+	if percentage > 80 {
+		// add the warning icon and percentage
+		formattedTokens = fmt.Sprintf("%s(%d%%)", styles.WarningIcon, int(percentage))
+	}
+
+	return fmt.Sprintf("Context: %s, Cost: %s", formattedTokens, formattedCost)
 }
 
 func (m statusCmp) View() string {
 	t := theme.CurrentTheme()
+	modelID := config.Get().Agents[config.AgentCoder].Model
+	model := models.SupportedModels[modelID]
 
 	// Initialize the help widget
-	status := getHelpWidget("")
+	status := getHelpWidget()
 
+	tokenInfoWidth := 0
 	if m.session.ID != "" {
-		tokens := formatTokensAndCost(m.session.PromptTokens+m.session.CompletionTokens, m.session.Cost)
+		totalTokens := m.session.PromptTokens + m.session.CompletionTokens
+		tokens := formatTokensAndCost(totalTokens, model.ContextWindow, m.session.Cost)
 		tokensStyle := styles.Padded().
 			Background(t.Text()).
-			Foreground(t.BackgroundSecondary()).
+			Foreground(t.BackgroundSecondary())
-			Render(tokens)
+		percentage := (float64(totalTokens) / float64(model.ContextWindow)) * 100
-		status += tokensStyle
+		if percentage > 80 {
+			tokensStyle = tokensStyle.Background(t.Warning())
+		}
+		tokenInfoWidth = lipgloss.Width(tokens) + 2
+		status += tokensStyle.Render(tokens)
 	}
 
 	diagnostics := styles.Padded().
 		Background(t.BackgroundDarker()).
 		Render(m.projectDiagnostics())
 
+	availableWidht := max(0, m.width-lipgloss.Width(helpWidget)-lipgloss.Width(m.model())-lipgloss.Width(diagnostics)-tokenInfoWidth)
+
 	if m.info.Msg != "" {
 		infoStyle := styles.Padded().
 			Foreground(t.Background()).
-			Width(m.availableFooterMsgWidth(diagnostics))
+			Width(availableWidht)
 
 		switch m.info.Type {
 		case util.InfoTypeInfo:
@@ -146,18 +159,18 @@ func (m statusCmp) View() string {
 			infoStyle = infoStyle.Background(t.Error())
 		}
 
+		infoWidth := availableWidht - 10
 		// Truncate message if it's longer than available width
 		msg := m.info.Msg
-		availWidth := m.availableFooterMsgWidth(diagnostics) - 10
+		if len(msg) > infoWidth && infoWidth > 0 {
-		if len(msg) > availWidth && availWidth > 0 {
+			msg = msg[:infoWidth] + "..."
-			msg = msg[:availWidth] + "..."
 		}
 		status += infoStyle.Render(msg)
 	} else {
 		status += styles.Padded().
 			Foreground(t.Text()).
 			Background(t.BackgroundSecondary()).
-			Width(m.availableFooterMsgWidth(diagnostics)).
+			Width(availableWidht).
 			Render("")
 	}
 
@@ -245,12 +258,10 @@ func (m *statusCmp) projectDiagnostics() string {
 	return strings.Join(diagnostics, " ")
 }
 
-func (m statusCmp) availableFooterMsgWidth(diagnostics string) int {
+func (m statusCmp) availableFooterMsgWidth(diagnostics, tokenInfo string) int {
-	tokens := ""
 	tokensWidth := 0
 	if m.session.ID != "" {
-		tokens = formatTokensAndCost(m.session.PromptTokens+m.session.CompletionTokens, m.session.Cost)
+		tokensWidth = lipgloss.Width(tokenInfo) + 2
-		tokensWidth = lipgloss.Width(tokens) + 2
 	}
 	return max(0, m.width-lipgloss.Width(helpWidget)-lipgloss.Width(m.model())-lipgloss.Width(diagnostics)-tokensWidth)
 }
@@ -272,14 +283,8 @@ func (m statusCmp) model() string {
 		Render(model.Name)
 }
 
-func (m statusCmp) SetHelpWidgetMsg(s string) {
-	// Update the help widget text using the getHelpWidget function
-	helpWidget = getHelpWidget(s)
-}
-
 func NewStatusCmp(lspClients map[string]*lsp.Client) StatusCmp {
-	// Initialize the help widget with default text
+	helpWidget = getHelpWidget()
-	helpWidget = getHelpWidget("")
 
 	return &statusCmp{
 		messageTTL: 10 * time.Second,

internal/tui/components/dialog/filepicker.go

@@ -302,11 +302,8 @@ func (f *filepickerCmp) View() string {
 		}
 		if file.IsDir() {
 			filename = filename + "/"
-		} else if isExtSupported(file.Name()) {
-			filename = filename
-		} else {
-			filename = filename
 		}
+		// No need to reassign filename if it's not changing
 
 		files = append(files, itemStyle.Padding(0, 1).Render(filename))
 	}

internal/tui/components/dialog/permission.go

@@ -2,6 +2,8 @@ package dialog
 
 import (
 	"fmt"
+	"strings"
+
 	"github.com/charmbracelet/bubbles/key"
 	"github.com/charmbracelet/bubbles/viewport"
 	tea "github.com/charmbracelet/bubbletea"
@@ -13,7 +15,6 @@ import (
 	"github.com/opencode-ai/opencode/internal/tui/styles"
 	"github.com/opencode-ai/opencode/internal/tui/theme"
 	"github.com/opencode-ai/opencode/internal/tui/util"
-	"strings"
 )
 
 type PermissionAction string
@@ -150,7 +151,7 @@ func (p *permissionDialogCmp) selectCurrentOption() tea.Cmd {
 func (p *permissionDialogCmp) renderButtons() string {
 	t := theme.CurrentTheme()
 	baseStyle := styles.BaseStyle()
-	
+
 	allowStyle := baseStyle
 	allowSessionStyle := baseStyle
 	denyStyle := baseStyle
@@ -196,7 +197,7 @@ func (p *permissionDialogCmp) renderButtons() string {
 func (p *permissionDialogCmp) renderHeader() string {
 	t := theme.CurrentTheme()
 	baseStyle := styles.BaseStyle()
-	
+
 	toolKey := baseStyle.Foreground(t.TextMuted()).Bold(true).Render("Tool")
 	toolValue := baseStyle.
 		Foreground(t.Text()).
@@ -229,9 +230,36 @@ func (p *permissionDialogCmp) renderHeader() string {
 	case tools.BashToolName:
 		headerParts = append(headerParts, baseStyle.Foreground(t.TextMuted()).Width(p.width).Bold(true).Render("Command"))
 	case tools.EditToolName:
-		headerParts = append(headerParts, baseStyle.Foreground(t.TextMuted()).Width(p.width).Bold(true).Render("Diff"))
+		params := p.permission.Params.(tools.EditPermissionsParams)
+		fileKey := baseStyle.Foreground(t.TextMuted()).Bold(true).Render("File")
+		filePath := baseStyle.
+			Foreground(t.Text()).
+			Width(p.width - lipgloss.Width(fileKey)).
+			Render(fmt.Sprintf(": %s", params.FilePath))
+		headerParts = append(headerParts,
+			lipgloss.JoinHorizontal(
+				lipgloss.Left,
+				fileKey,
+				filePath,
+			),
+			baseStyle.Render(strings.Repeat(" ", p.width)),
+		)
+
 	case tools.WriteToolName:
-		headerParts = append(headerParts, baseStyle.Foreground(t.TextMuted()).Width(p.width).Bold(true).Render("Diff"))
+		params := p.permission.Params.(tools.WritePermissionsParams)
+		fileKey := baseStyle.Foreground(t.TextMuted()).Bold(true).Render("File")
+		filePath := baseStyle.
+			Foreground(t.Text()).
+			Width(p.width - lipgloss.Width(fileKey)).
+			Render(fmt.Sprintf(": %s", params.FilePath))
+		headerParts = append(headerParts,
+			lipgloss.JoinHorizontal(
+				lipgloss.Left,
+				fileKey,
+				filePath,
+			),
+			baseStyle.Render(strings.Repeat(" ", p.width)),
+		)
 	case tools.FetchToolName:
 		headerParts = append(headerParts, baseStyle.Foreground(t.TextMuted()).Width(p.width).Bold(true).Render("URL"))
 	}
@@ -242,13 +270,13 @@ func (p *permissionDialogCmp) renderHeader() string {
 func (p *permissionDialogCmp) renderBashContent() string {
 	t := theme.CurrentTheme()
 	baseStyle := styles.BaseStyle()
-	
+
 	if pr, ok := p.permission.Params.(tools.BashPermissionsParams); ok {
 		content := fmt.Sprintf("```bash\n%s\n```", pr.Command)
 
 		// Use the cache for markdown rendering
 		renderedContent := p.GetOrSetMarkdown(p.permission.ID, func() (string, error) {
-			r := styles.GetMarkdownRenderer(p.width-10)
+			r := styles.GetMarkdownRenderer(p.width - 10)
 			s, err := r.Render(content)
 			return styles.ForceReplaceBackgroundWithLipgloss(s, t.Background()), err
 		})
@@ -302,13 +330,13 @@ func (p *permissionDialogCmp) renderWriteContent() string {
 func (p *permissionDialogCmp) renderFetchContent() string {
 	t := theme.CurrentTheme()
 	baseStyle := styles.BaseStyle()
-	
+
 	if pr, ok := p.permission.Params.(tools.FetchPermissionsParams); ok {
 		content := fmt.Sprintf("```bash\n%s\n```", pr.URL)
 
 		// Use the cache for markdown rendering
 		renderedContent := p.GetOrSetMarkdown(p.permission.ID, func() (string, error) {
-			r := styles.GetMarkdownRenderer(p.width-10)
+			r := styles.GetMarkdownRenderer(p.width - 10)
 			s, err := r.Render(content)
 			return styles.ForceReplaceBackgroundWithLipgloss(s, t.Background()), err
 		})
@@ -325,12 +353,12 @@ func (p *permissionDialogCmp) renderFetchContent() string {
 func (p *permissionDialogCmp) renderDefaultContent() string {
 	t := theme.CurrentTheme()
 	baseStyle := styles.BaseStyle()
-	
+
 	content := p.permission.Description
 
 	// Use the cache for markdown rendering
 	renderedContent := p.GetOrSetMarkdown(p.permission.ID, func() (string, error) {
-		r := styles.GetMarkdownRenderer(p.width-10)
+		r := styles.GetMarkdownRenderer(p.width - 10)
 		s, err := r.Render(content)
 		return styles.ForceReplaceBackgroundWithLipgloss(s, t.Background()), err
 	})
@@ -358,7 +386,7 @@ func (p *permissionDialogCmp) styleViewport() string {
 func (p *permissionDialogCmp) render() string {
 	t := theme.CurrentTheme()
 	baseStyle := styles.BaseStyle()
-	
+
 	title := baseStyle.
 		Bold(true).
 		Width(p.width - 4).

internal/tui/tui.go

@@ -10,14 +10,17 @@ import (
 	"github.com/charmbracelet/lipgloss"
 	"github.com/opencode-ai/opencode/internal/app"
 	"github.com/opencode-ai/opencode/internal/config"
+	"github.com/opencode-ai/opencode/internal/llm/agent"
 	"github.com/opencode-ai/opencode/internal/logging"
 	"github.com/opencode-ai/opencode/internal/permission"
 	"github.com/opencode-ai/opencode/internal/pubsub"
+	"github.com/opencode-ai/opencode/internal/session"
 	"github.com/opencode-ai/opencode/internal/tui/components/chat"
 	"github.com/opencode-ai/opencode/internal/tui/components/core"
 	"github.com/opencode-ai/opencode/internal/tui/components/dialog"
 	"github.com/opencode-ai/opencode/internal/tui/layout"
 	"github.com/opencode-ai/opencode/internal/tui/page"
+	"github.com/opencode-ai/opencode/internal/tui/theme"
 	"github.com/opencode-ai/opencode/internal/tui/util"
 )
 
@@ -32,6 +35,8 @@ type keyMap struct {
 	SwitchTheme   key.Binding
 }
 
+type startCompactSessionMsg struct{}
+
 const (
 	quitKey = "q"
 )
@@ -91,13 +96,14 @@ var logsKeyReturnKey = key.NewBinding(
 )
 
 type appModel struct {
-	width, height int
+	width, height   int
-	currentPage   page.PageID
+	currentPage     page.PageID
-	previousPage  page.PageID
+	previousPage    page.PageID
-	pages         map[page.PageID]tea.Model
+	pages           map[page.PageID]tea.Model
-	loadedPages   map[page.PageID]bool
+	loadedPages     map[page.PageID]bool
-	status        core.StatusCmp
+	status          core.StatusCmp
-	app           *app.App
+	app             *app.App
+	selectedSession session.Session
 
 	showPermissions bool
 	permissions     dialog.PermissionDialogCmp
@@ -126,9 +132,12 @@ type appModel struct {
 
 	showThemeDialog bool
 	themeDialog     dialog.ThemeDialog
-	
+
 	showArgumentsDialog bool
 	argumentsDialog     dialog.ArgumentsDialogCmp
+
+	isCompacting      bool
+	compactingMessage string
 }
 
 func (a appModel) Init() tea.Cmd {
@@ -151,6 +160,7 @@ func (a appModel) Init() tea.Cmd {
 	cmd = a.initDialog.Init()
 	cmds = append(cmds, cmd)
 	cmd = a.filepicker.Init()
+	cmds = append(cmds, cmd)
 	cmd = a.themeDialog.Init()
 	cmds = append(cmds, cmd)
 
@@ -203,7 +213,7 @@ func (a appModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		cmds = append(cmds, filepickerCmd)
 
 		a.initDialog.SetSize(msg.Width, msg.Height)
-		
+
 		if a.showArgumentsDialog {
 			a.argumentsDialog.SetSize(msg.Width, msg.Height)
 			args, argsCmd := a.argumentsDialog.Update(msg)
@@ -293,6 +303,70 @@ func (a appModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		a.showCommandDialog = false
 		return a, nil
 
+	case startCompactSessionMsg:
+		// Start compacting the current session
+		a.isCompacting = true
+		a.compactingMessage = "Starting summarization..."
+
+		if a.selectedSession.ID == "" {
+			a.isCompacting = false
+			return a, util.ReportWarn("No active session to summarize")
+		}
+
+		// Start the summarization process
+		return a, func() tea.Msg {
+			ctx := context.Background()
+			a.app.CoderAgent.Summarize(ctx, a.selectedSession.ID)
+			return nil
+		}
+
+	case pubsub.Event[agent.AgentEvent]:
+		payload := msg.Payload
+		if payload.Error != nil {
+			a.isCompacting = false
+			return a, util.ReportError(payload.Error)
+		}
+
+		a.compactingMessage = payload.Progress
+
+		if payload.Done && payload.Type == agent.AgentEventTypeSummarize {
+			a.isCompacting = false
+
+			if payload.SessionID != "" {
+				// Switch to the new session
+				return a, func() tea.Msg {
+					sessions, err := a.app.Sessions.List(context.Background())
+					if err != nil {
+						return util.InfoMsg{
+							Type: util.InfoTypeError,
+							Msg:  "Failed to list sessions: " + err.Error(),
+						}
+					}
+
+					for _, s := range sessions {
+						if s.ID == payload.SessionID {
+							return dialog.SessionSelectedMsg{Session: s}
+						}
+					}
+
+					return util.InfoMsg{
+						Type: util.InfoTypeError,
+						Msg:  "Failed to find new session",
+					}
+				}
+			}
+			return a, util.ReportInfo("Session summarization complete")
+		} else if payload.Done && payload.Type == agent.AgentEventTypeResponse && a.selectedSession.ID != "" {
+			model := a.app.CoderAgent.Model()
+			contextWindow := model.ContextWindow
+			tokens := a.selectedSession.CompletionTokens + a.selectedSession.PromptTokens
+			if (tokens >= int64(float64(contextWindow)*0.95)) && config.Get().AutoCompact {
+				return a, util.CmdHandler(startCompactSessionMsg{})
+			}
+		}
+		// Continue listening for events
+		return a, nil
+
 	case dialog.CloseThemeDialogMsg:
 		a.showThemeDialog = false
 		return a, nil
@@ -342,7 +416,13 @@ func (a appModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		return a, nil
 
 	case chat.SessionSelectedMsg:
+		a.selectedSession = msg
 		a.sessionDialog.SetSelectedSession(msg.ID)
+
+	case pubsub.Event[session.Session]:
+		if msg.Type == pubsub.UpdatedEvent && msg.Payload.ID == a.selectedSession.ID {
+			a.selectedSession = msg.Payload
+		}
 	case dialog.SessionSelectedMsg:
 		a.showSessionDialog = false
 		if a.currentPage == page.ChatPage {
@@ -357,22 +437,22 @@ func (a appModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			return a, msg.Command.Handler(msg.Command)
 		}
 		return a, util.ReportInfo("Command selected: " + msg.Command.Title)
-		
+
 	case dialog.ShowArgumentsDialogMsg:
 		// Show arguments dialog
 		a.argumentsDialog = dialog.NewArgumentsDialogCmp(msg.CommandID, msg.Content)
 		a.showArgumentsDialog = true
 		return a, a.argumentsDialog.Init()
-		
+
 	case dialog.CloseArgumentsDialogMsg:
 		// Close arguments dialog
 		a.showArgumentsDialog = false
-		
+
 		// If submitted, replace $ARGUMENTS and run the command
 		if msg.Submit {
 			// Replace $ARGUMENTS with the provided arguments
 			content := strings.ReplaceAll(msg.Content, "$ARGUMENTS", msg.Arguments)
-			
+
 			// Execute the command with arguments
 			return a, util.CmdHandler(dialog.CommandRunCustomMsg{
 				Content: content,
@@ -387,7 +467,7 @@ func (a appModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			a.argumentsDialog = args.(dialog.ArgumentsDialogCmp)
 			return a, cmd
 		}
-		
+
 		switch {
 
 		case key.Matches(msg, keys.Quit):
@@ -606,6 +686,15 @@ func (a *appModel) RegisterCommand(cmd dialog.Command) {
 	a.commands = append(a.commands, cmd)
 }
 
+func (a *appModel) findCommand(id string) (dialog.Command, bool) {
+	for _, cmd := range a.commands {
+		if cmd.ID == id {
+			return cmd, true
+		}
+	}
+	return dialog.Command{}, false
+}
+
 func (a *appModel) moveToPage(pageID page.PageID) tea.Cmd {
 	if a.app.CoderAgent.IsBusy() {
 		// For now we don't move to any page if the agent is busy
@@ -668,10 +757,29 @@ func (a appModel) View() string {
 
 	}
 
-	if !a.app.CoderAgent.IsBusy() {
+	// Show compacting status overlay
-		a.status.SetHelpWidgetMsg("ctrl+? help")
+	if a.isCompacting {
-	} else {
+		t := theme.CurrentTheme()
-		a.status.SetHelpWidgetMsg("? help")
+		style := lipgloss.NewStyle().
+			Border(lipgloss.RoundedBorder()).
+			BorderForeground(t.BorderFocused()).
+			BorderBackground(t.Background()).
+			Padding(1, 2).
+			Background(t.Background()).
+			Foreground(t.Text())
+
+		overlay := style.Render("Summarizing\n" + a.compactingMessage)
+		row := lipgloss.Height(appView) / 2
+		row -= lipgloss.Height(overlay) / 2
+		col := lipgloss.Width(appView) / 2
+		col -= lipgloss.Width(overlay) / 2
+		appView = layout.PlaceOverlay(
+			col,
+			row,
+			overlay,
+			appView,
+			true,
+		)
 	}
 
 	if a.showHelp {
@@ -789,7 +897,7 @@ func (a appModel) View() string {
 			true,
 		)
 	}
-	
+
 	if a.showArgumentsDialog {
 		overlay := a.argumentsDialog.View()
 		row := lipgloss.Height(appView) / 2
@@ -850,7 +958,17 @@ If there are Cursor rules (in .cursor/rules/ or .cursorrules) or Copilot rules (
 			)
 		},
 	})
-	
+
+	model.RegisterCommand(dialog.Command{
+		ID:          "compact",
+		Title:       "Compact Session",
+		Description: "Summarize the current session and create a new one with the summary",
+		Handler: func(cmd dialog.Command) tea.Cmd {
+			return func() tea.Msg {
+				return startCompactSessionMsg{}
+			}
+		},
+	})
 	// Load custom commands
 	customCommands, err := dialog.LoadCustomCommands()
 	if err != nil {
@@ -860,6 +978,6 @@ If there are Cursor rules (in .cursor/rules/ or .cursorrules) or Copilot rules (
 			model.RegisterCommand(cmd)
 		}
 	}
-	
+
 	return model
 }

scripts/check_hidden_chars.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Script to check for hidden/invisible characters in Go files
+# This helps detect potential prompt injection attempts
+
+echo "Checking Go files for hidden characters..."
+
+# Find all Go files in the repository
+go_files=$(find . -name "*.go" -type f)
+
+# Counter for files with hidden characters
+files_with_hidden=0
+
+for file in $go_files; do
+  # Check for specific Unicode hidden characters that could be used for prompt injection
+  # This excludes normal whitespace like tabs and newlines
+  # Looking for:
+  # - Zero-width spaces (U+200B)
+  # - Zero-width non-joiners (U+200C)
+  # - Zero-width joiners (U+200D)
+  # - Left-to-right/right-to-left marks (U+200E, U+200F)
+  # - Bidirectional overrides (U+202A-U+202E)
+  # - Byte order mark (U+FEFF)
+  if hexdump -C "$file" | grep -E 'e2 80 8b|e2 80 8c|e2 80 8d|e2 80 8e|e2 80 8f|e2 80 aa|e2 80 ab|e2 80 ac|e2 80 ad|e2 80 ae|ef bb bf' > /dev/null 2>&1; then
+    echo "Hidden characters found in: $file"
+    
+    # Show the file with potential issues
+    echo "  Hexdump showing suspicious characters:"
+    hexdump -C "$file" | grep -E 'e2 80 8b|e2 80 8c|e2 80 8d|e2 80 8e|e2 80 8f|e2 80 aa|e2 80 ab|e2 80 ac|e2 80 ad|e2 80 ae|ef bb bf' | head -10
+    
+    files_with_hidden=$((files_with_hidden + 1))
+  fi
+done
+
+if [ $files_with_hidden -eq 0 ]; then
+  echo "No hidden characters found in any Go files."
+else
+  echo "Found hidden characters in $files_with_hidden Go file(s)."
+fi
+
+exit $files_with_hidden  # Exit with number of affected files as status code