diff --git a/brain/config.go b/brain/config.go
old mode 100644
new mode 100755
diff --git a/brain/guard.go b/brain/guard.go
old mode 100644
new mode 100755
diff --git a/brain/llm/metrics.go b/brain/llm/metrics.go
old mode 100644
new mode 100755
diff --git a/brain/visual.go b/brain/visual.go
new file mode 100644
index 00000000..ba60e327
--- /dev/null
+++ b/brain/visual.go
@@ -0,0 +1,99 @@
+package brain
+
+import (
+	"fmt"
+
+	"github.com/hrygo/hotplex/provider"
+)
+
+// Visualizer translates provider events into human-readable messages for UI display.
+type Visualizer struct{}
+
+// NewVisualizer creates a new Visualizer.
+func NewVisualizer() *Visualizer {
+	return &Visualizer{}
+}
+
+// TranslateEvent translates a provider event into a human-readable message.
+// It uses session context to provide more accurate translations.
+func (v *Visualizer) TranslateEvent(evt *provider.ProviderEvent, platform, taskType string) string {
+	switch evt.Type {
+	case provider.EventTypeToolUse:
+		return v.translateToolUse(evt, platform)
+	case provider.EventTypeThinking:
+		return v.translateThinking(evt, platform)
+	case provider.EventTypeResult:
+		return v.translateResult(evt)
+	case provider.EventTypeError:
+		return v.translateError(evt)
+	default:
+		return ""
+	}
+}
+
+// translateToolUse translates a tool use event.
+func (v *Visualizer) translateToolUse(evt *provider.ProviderEvent, platform string) string {
+	toolName := evt.ToolName
+	if toolName == "" {
+		toolName = "unknown tool"
+	}
+
+	switch platform {
+	case "slack":
+		return fmt.Sprintf("🔧 Executing %s...", toolName)
+	case "feishu":
+		return fmt.Sprintf("🔧 正在执行 %s...", toolName)
+	default:
+		return fmt.Sprintf("Executing %s...", toolName)
+	}
+}
+
+// translateThinking translates a thinking event.
+func (v *Visualizer) translateThinking(evt *provider.ProviderEvent, platform string) string {
+	switch platform {
+	case "slack":
+		return "🤔 Thinking..."
+	case "feishu":
+		return "🤔 思考中..."
+	default:
+		return "Thinking..."
+	}
+}
+
+// translateResult translates a result event.
+func (v *Visualizer) translateResult(evt *provider.ProviderEvent) string {
+	if evt.Metadata != nil && evt.Metadata.TotalDurationMs > 0 {
+		return fmt.Sprintf("✓ Completed in %dms", evt.Metadata.TotalDurationMs)
+	}
+	return "✓ Completed"
+}
+
+// translateError translates an error event.
+func (v *Visualizer) translateError(evt *provider.ProviderEvent) string {
+	errMsg := evt.Error
+	if errMsg == "" {
+		return "❌ An error occurred"
+	}
+	if len(errMsg) > 100 {
+		errMsg = errMsg[:100] + "..."
+	}
+	return fmt.Sprintf("❌ Error: %s", errMsg)
+}
+
+// GetTaskTypeSummary returns a brief summary of the task type for display.
+func (v *Visualizer) GetTaskTypeSummary(taskType string) string {
+	switch taskType {
+	case "code":
+		return "💻 Code"
+	case "chat":
+		return "💬 Chat"
+	case "analysis":
+		return "📊 Analysis"
+	case "debug":
+		return "🐛 Debug"
+	case "git":
+		return "🔀 Git"
+	default:
+		return "❓ Unknown"
+	}
+}
diff --git a/chatapps/engine_handler.go b/chatapps/engine_handler.go
index 1b6b61c1..f7dd30ae 100644
--- a/chatapps/engine_handler.go
+++ b/chatapps/engine_handler.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log/slog"
+	"regexp"
 	"strings"
 	"sync"
 	"time"
@@ -15,6 +16,7 @@ import (
 	intengine "github.com/hrygo/hotplex/internal/engine"
 	"github.com/hrygo/hotplex/provider"
 	"github.com/hrygo/hotplex/types"
+	"github.com/hrygo/hotplex/internal/trace"
 )
 
 const (
@@ -1422,6 +1424,26 @@ func (h *EngineMessageHandler) Handle(ctx context.Context, msg *ChatMessage) err
 		TaskInstructions: fullInstructions,
 	}
 
+	// Fill observability fields from message context
+	cfg.Platform = msg.Platform
+	cfg.UserID = msg.UserID
+	if channelID, ok := msg.Metadata["channel_id"].(string); ok {
+		cfg.ChannelID = channelID
+	}
+	if teamID, ok := msg.Metadata["team_id"].(string); ok {
+		cfg.TeamID = teamID
+	}
+	// Task type detection based on prompt content
+	cfg.TaskType = detectTaskType(msg.Content)
+	// Generate trace ID for distributed tracing
+	cfg.TraceID = trace.GenerateSimple()
+	// Summarize first prompt for debugging
+	if len(msg.Content) > 100 {
+		cfg.PromptSummary = msg.Content[:100] + "..."
+	} else {
+		cfg.PromptSummary = msg.Content
+	}
+
 	// Get platform-specific operations from AdapterManager
 	messageOps := h.adapters.GetMessageOperations(msg.Platform)
 	sessionOps := h.adapters.GetSessionOperations(msg.Platform)
@@ -1737,3 +1759,39 @@ func formatDataLength(bytes int64) string {
 	}
 	return fmt.Sprintf("%d bytes", bytes)
 }
+
+// Task type detection patterns
+var (
+	codePatterns = regexp.MustCompile(`(?i)(write|create|fix|debug|implement|refactor|add|remove|update|code|function|class|method|script|api|endpoint|query|sql|test|spec|deploy|build|compile|run|execute)`)
+	gitPatterns  = regexp.MustCompile(`(?i)(git|commit|push|pull|merge|branch|checkout|rebase|clone|fetch|status|log|diff|reset|cherry|tag|stash|init)`)
+	debugPatterns = regexp.MustCompile(`(?i)(debug|error|bug|exception|stack|trace|issue|problem|fail|crash|broken|fix|repair)`)
+	analysisPatterns = regexp.MustCompile(`(?i)(analyze|analyse|review|explain|describe|what|how|why|compare|summary|extract|parse|crawl|fetch|fetch|get|list|search|find|look)`)
+)
+
+// detectTaskType detects the task type based on prompt content
+func detectTaskType(prompt string) string {
+	lowerPrompt := strings.ToLower(prompt)
+
+	// Check for code-related tasks
+	if codePatterns.MatchString(lowerPrompt) && !gitPatterns.MatchString(lowerPrompt) {
+		return "code"
+	}
+
+	// Check for git tasks
+	if gitPatterns.MatchString(lowerPrompt) {
+		return "git"
+	}
+
+	// Check for debug tasks
+	if debugPatterns.MatchString(lowerPrompt) {
+		return "debug"
+	}
+
+	// Check for analysis/review tasks
+	if analysisPatterns.MatchString(lowerPrompt) {
+		return "analysis"
+	}
+
+	// Default to chat
+	return "chat"
+}
diff --git a/chatapps/slack/builder.go b/chatapps/slack/builder.go
old mode 100644
new mode 100755
diff --git a/chatapps/slack/streaming_writer.go b/chatapps/slack/streaming_writer.go
old mode 100644
new mode 100755
diff --git a/engine/runner.go b/engine/runner.go
index 86e9af73..ea008f50 100644
--- a/engine/runner.go
+++ b/engine/runner.go
@@ -155,7 +155,12 @@ func (r *Engine) Execute(ctx context.Context, cfg *types.Config, prompt string,
 
 	r.logger.Info("Engine: starting execution pipeline",
 		"namespace", r.opts.Namespace,
-		"session_id", cfg.SessionID)
+		"session_id", cfg.SessionID,
+		"platform", cfg.Platform,
+		"user_id", cfg.UserID,
+		"channel_id", cfg.ChannelID,
+		"task_type", cfg.TaskType,
+		"trace_id", cfg.TraceID)
 
 	// Execute via multiplexed persistent session
 	if err := r.executeWithMultiplex(ctx, cfg, prompt, callback); err != nil {
@@ -168,7 +173,10 @@ func (r *Engine) Execute(ctx context.Context, cfg *types.Config, prompt string,
 
 	r.logger.Info("Engine: Session completed",
 		"namespace", r.opts.Namespace,
-		"session_id", cfg.SessionID)
+		"session_id", cfg.SessionID,
+		"platform", cfg.Platform,
+		"task_type", cfg.TaskType,
+		"trace_id", cfg.TraceID)
 
 	return nil
 }
diff --git a/internal/secrets/provider.go b/internal/secrets/provider.go
old mode 100644
new mode 100755
diff --git a/internal/telemetry/metrics.go b/internal/telemetry/metrics.go
old mode 100644
new mode 100755
index ba37e770..49d9e2e7
--- a/internal/telemetry/metrics.go
+++ b/internal/telemetry/metrics.go
@@ -15,6 +15,13 @@ type Metrics struct {
 	dangersBlocked  int64
 	requestDuration time.Duration
 
+	// Dimensioned metrics (platform, task_type)
+	sessionDurationBuckets map[sessionKey]durationBucket
+	sessionTurns           map[sessionKey]int64
+	sessionErrors          map[sessionKey]int64
+	toolsInvokedByType     map[sessionKey]int64
+	sessionTokens          map[sessionKey]int64
+
 	// Slack permission metrics
 	slackPermissionAllowed        int64
 	slackPermissionBlockedUser    int64
@@ -23,6 +30,17 @@ type Metrics struct {
 	mu                            sync.RWMutex
 }
 
+type sessionKey struct {
+	platform  string
+	taskType  string
+	direction string // input/output for tokens
+}
+
+type durationBucket struct {
+	sum   time.Duration
+	count int64
+}
+
 var (
 	globalMetrics   *Metrics
 	globalMetricsMu sync.Once
@@ -32,7 +50,14 @@ func NewMetrics(logger *slog.Logger) *Metrics {
 	if logger == nil {
 		logger = slog.Default()
 	}
-	return &Metrics{logger: logger}
+	return &Metrics{
+		logger:                 logger,
+		sessionDurationBuckets: make(map[sessionKey]durationBucket),
+		sessionTurns:           make(map[sessionKey]int64),
+		sessionErrors:          make(map[sessionKey]int64),
+		toolsInvokedByType:     make(map[sessionKey]int64),
+		sessionTokens:          make(map[sessionKey]int64),
+	}
 }
 
 func (m *Metrics) IncSessionsActive() {
@@ -134,6 +159,52 @@ func (m *Metrics) IncSlackPermissionBlockedMention() {
 	m.mu.Unlock()
 }
 
+// Dimensioned Metrics Methods
+
+// RecordSessionDuration records session duration with platform and task_type dimensions.
+func (m *Metrics) RecordSessionDuration(platform, taskType string, duration time.Duration) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	key := sessionKey{platform: platform, taskType: taskType}
+	bucket := m.sessionDurationBuckets[key]
+	bucket.sum += duration
+	bucket.count++
+	m.sessionDurationBuckets[key] = bucket
+}
+
+// IncSessionTurns increments turn count with platform and task_type dimensions.
+func (m *Metrics) IncSessionTurns(platform, taskType string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	key := sessionKey{platform: platform, taskType: taskType}
+	m.sessionTurns[key]++
+}
+
+// IncSessionErrorsByType increments error count with platform and task_type dimensions.
+func (m *Metrics) IncSessionErrorsByType(platform, taskType string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	key := sessionKey{platform: platform, taskType: taskType}
+	m.sessionErrors[key]++
+}
+
+// IncToolsInvokedByType increments tools invoked with platform and task_type dimensions.
+func (m *Metrics) IncToolsInvokedByType(platform, taskType string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	key := sessionKey{platform: platform, taskType: taskType}
+	m.toolsInvokedByType[key]++
+}
+
+// RecordTokens records token consumption with platform and task_type dimensions.
+// direction should be "input" or "output".
+func (m *Metrics) RecordTokens(platform, taskType, direction string, tokens int64) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	key := sessionKey{platform: platform, taskType: taskType, direction: direction}
+	m.sessionTokens[key] += tokens
+}
+
 func InitMetrics(logger *slog.Logger) {
 	globalMetrics = NewMetrics(logger)
 }
diff --git a/internal/trace/traceid.go b/internal/trace/traceid.go
new file mode 100644
index 00000000..56a30ed1
--- /dev/null
+++ b/internal/trace/traceid.go
@@ -0,0 +1,44 @@
+package trace
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"strings"
+	"time"
+)
+
+// Generator generates trace IDs for distributed tracing.
+type Generator struct {
+	prefix string
+}
+
+// New creates a new trace ID generator with optional prefix.
+func New(prefix string) *Generator {
+	if prefix == "" {
+		prefix = "hotplex"
+	}
+	return &Generator{prefix: prefix}
+}
+
+// Generate generates a new trace ID.
+// Format: {prefix}-{timestamp}-{random}
+// Example: hotplex-6076b8cb-8a2f4d3e
+func (g *Generator) Generate() string {
+	// Get current timestamp in hex (8 chars)
+	timestamp := time.Now().UnixNano() >> 20 // Shift to get ~8 hex chars
+
+	// Generate 8 random bytes (16 hex chars)
+	randomBytes := make([]byte, 8)
+	rand.Read(randomBytes)
+	randomHex := hex.EncodeToString(randomBytes)[:8]
+
+	ts := strings.TrimLeft(hex.EncodeToString([]byte{byte(timestamp >> 24), byte(timestamp >> 16), byte(timestamp >> 8), byte(timestamp)}), "0")
+	return strings.Join([]string{g.prefix, ts, randomHex}, "-")
+}
+
+// GenerateSimple generates a simple 16-character hex trace ID.
+func GenerateSimple() string {
+	bytes := make([]byte, 8)
+	rand.Read(bytes)
+	return hex.EncodeToString(bytes)[:16]
+}
diff --git a/plugins/storage/config.go b/plugins/storage/config.go
old mode 100644
new mode 100755
index cc713aeb..506566bb
--- a/plugins/storage/config.go
+++ b/plugins/storage/config.go
@@ -70,7 +70,10 @@ func ExportToJSON(store ChatAppMessageStore, outputPath string, query *MessageQu
 		return fmt.Errorf("failed to marshal messages: %w", err)
 	}
 
-	return os.WriteFile(outputPath, data, 0644)
+	if err := os.WriteFile(outputPath, data, 0644); err != nil {
+		return fmt.Errorf("failed to write export file: %w", err)
+	}
+	return nil
 }
 
 // ImportFromJSON 从 JSON 导入消息
@@ -129,5 +132,8 @@ func BackupStorage(store ChatAppMessageStore, backupPath string) error {
 		return fmt.Errorf("failed to marshal backup: %w", err)
 	}
 
-	return os.WriteFile(backupPath, data, 0644)
+	if err := os.WriteFile(backupPath, data, 0644); err != nil {
+		return fmt.Errorf("failed to write backup file: %w", err)
+	}
+	return nil
 }
diff --git a/plugins/storage/interface.go b/plugins/storage/interface.go
old mode 100644
new mode 100755
diff --git a/provider/claude_provider.go b/provider/claude_provider.go
old mode 100644
new mode 100755
diff --git a/provider/pi_provider.go b/provider/pi_provider.go
old mode 100644
new mode 100755
diff --git a/provider/pi_provider_test.go b/provider/pi_provider_test.go
old mode 100644
new mode 100755
diff --git a/provider/provider.go b/provider/provider.go
old mode 100644
new mode 100755
diff --git a/types/types.go b/types/types.go
index c3702eeb..aee78d5b 100644
--- a/types/types.go
+++ b/types/types.go
@@ -109,4 +109,13 @@ type Config struct {
 	SessionID        string // Unique identifier used to route the request to a persistent process in the pool
 	TaskInstructions string // Per-task instructions or objective prepended to the user prompt
 	WAFApproved      bool   // When true, Engine skips WAF check (already approved by chatapps layer)
+
+	// SessionContext for observability
+	Platform      string // slack/feishu/discord/telegram
+	UserID        string // User identifier
+	ChannelID     string // Source channel/group
+	TeamID        string // Team/workspace identifier
+	TaskType      string // code/chat/analysis/debug/git
+	TraceID       string // OpenTelemetry TraceID
+	PromptSummary string // First prompt summary
 }