Move SDK processing to async queue.

internal/worker/sdk/processor.go

@@ -9,7 +9,6 @@ import (
 	"os/exec"
 	"path/filepath"
 	"strings"
-	"sync"
 	"time"
 
 	json "github.com/goccy/go-json"
@@ -39,7 +38,8 @@ type Processor struct {
 	broadcastFunc       BroadcastFunc
 	syncObservationFunc SyncObservationFunc
 	syncSummaryFunc     SyncSummaryFunc
-	mu                  sync.Mutex
+	// Semaphore to limit concurrent Claude CLI calls (prevents API overload)
+	sem chan struct{}
 }
 
 // SetBroadcastFunc sets the broadcast callback for SSE events.
@@ -64,6 +64,10 @@ func (p *Processor) broadcast(event map[string]interface{}) {
 	}
 }
 
+// MaxConcurrentCLICalls is the maximum number of concurrent Claude CLI calls.
+// This prevents overwhelming the API and manages resource usage.
+const MaxConcurrentCLICalls = 4
+
 // NewProcessor creates a new SDK processor.
 func NewProcessor(observationStore *sqlite.ObservationStore, summaryStore *sqlite.SummaryStore) (*Processor, error) {
 	cfg := config.Get()
@@ -89,6 +93,7 @@ func NewProcessor(observationStore *sqlite.ObservationStore, summaryStore *sqlit
 		model:            cfg.Model,
 		observationStore: observationStore,
 		summaryStore:     summaryStore,
+		sem:              make(chan struct{}, MaxConcurrentCLICalls),
 	}, nil
 }
 
@@ -100,9 +105,6 @@ func (p *Processor) IsAvailable() bool {
 
 // ProcessObservation processes a single tool observation and extracts insights.
 func (p *Processor) ProcessObservation(ctx context.Context, sdkSessionID, project string, toolName string, toolInput, toolResponse interface{}, promptNumber int, cwd string) error {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-
 	// Skip certain tools that aren't worth processing
 	if shouldSkipTool(toolName) {
 		log.Info().Str("tool", toolName).Msg("Skipping tool (not interesting for memory)")
@@ -136,6 +138,14 @@ func (p *Processor) ProcessObservation(ctx context.Context, sdkSessionID, projec
 	}
 	prompt := BuildObservationPrompt(exec)
 
+	// Acquire semaphore slot (limits concurrent CLI calls)
+	select {
+	case p.sem <- struct{}{}:
+		defer func() { <-p.sem }()
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+
 	// Call Claude Code CLI
 	response, err := p.callClaudeCLI(ctx, prompt)
 	if err != nil {
@@ -226,9 +236,6 @@ func (p *Processor) ProcessObservation(ctx context.Context, sdkSessionID, projec
 
 // ProcessSummary processes a session summary request.
 func (p *Processor) ProcessSummary(ctx context.Context, sessionDBID int64, sdkSessionID, project, userPrompt, lastUserMsg, lastAssistantMsg string) error {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-
 	// Skip summary generation if there's no meaningful assistant response
 	// This prevents generic "initial session setup" summaries
 	if !hasMeaningfulContent(lastAssistantMsg) {
@@ -249,6 +256,14 @@ func (p *Processor) ProcessSummary(ctx context.Context, sessionDBID int64, sdkSe
 	}
 	prompt := BuildSummaryPrompt(req)
 
+	// Acquire semaphore slot (limits concurrent CLI calls)
+	select {
+	case p.sem <- struct{}{}:
+		defer func() { <-p.sem }()
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+
 	// Call Claude Code CLI
 	response, err := p.callClaudeCLI(ctx, prompt)
 	if err != nil {

internal/worker/service.go

@@ -736,10 +736,14 @@ func (s *Service) processQueue() {
 }
 
 // processAllSessions processes pending messages for all active sessions.
+// Messages are processed in parallel using goroutines, with concurrency
+// limited by the processor's semaphore.
 func (s *Service) processAllSessions() {
 	// Get all sessions with pending messages
 	sessions := s.sessionManager.GetAllSessions()
 
+	var wg sync.WaitGroup
+
 	for _, sess := range sessions {
 		// Get pending messages
 		messages := s.sessionManager.DrainMessages(sess.SessionDBID)
@@ -747,52 +751,61 @@ func (s *Service) processAllSessions() {
 			continue
 		}
 
-		// Process each message
+		// Process each message in a goroutine
 		for _, msg := range messages {
-			switch msg.Type {
-			case session.MessageTypeObservation:
-				if msg.Observation != nil {
-					err := s.processor.ProcessObservation(
-						s.ctx,
-						sess.SDKSessionID,
-						sess.Project,
-						msg.Observation.ToolName,
-						msg.Observation.ToolInput,
-						msg.Observation.ToolResponse,
-						msg.Observation.PromptNumber,
-						msg.Observation.CWD,
-					)
-					if err != nil {
-						log.Error().Err(err).
-							Str("tool", msg.Observation.ToolName).
-							Msg("Failed to process observation")
-					}
-				}
+			wg.Add(1)
+			go func(sess *session.ActiveSession, msg session.PendingMessage) {
+				defer wg.Done()
 
-			case session.MessageTypeSummarize:
-				if msg.Summarize != nil {
-					err := s.processor.ProcessSummary(
-						s.ctx,
-						sess.SessionDBID,
-						sess.SDKSessionID,
-						sess.Project,
-						sess.UserPrompt,
-						msg.Summarize.LastUserMessage,
-						msg.Summarize.LastAssistantMessage,
-					)
-					if err != nil {
-						log.Error().Err(err).
-							Int64("sessionId", sess.SessionDBID).
-							Msg("Failed to process summary")
+				switch msg.Type {
+				case session.MessageTypeObservation:
+					if msg.Observation != nil {
+						err := s.processor.ProcessObservation(
+							s.ctx,
+							sess.SDKSessionID,
+							sess.Project,
+							msg.Observation.ToolName,
+							msg.Observation.ToolInput,
+							msg.Observation.ToolResponse,
+							msg.Observation.PromptNumber,
+							msg.Observation.CWD,
+						)
+						if err != nil {
+							log.Error().Err(err).
+								Str("tool", msg.Observation.ToolName).
+								Msg("Failed to process observation")
+						}
+					}
+
+				case session.MessageTypeSummarize:
+					if msg.Summarize != nil {
+						err := s.processor.ProcessSummary(
+							s.ctx,
+							sess.SessionDBID,
+							sess.SDKSessionID,
+							sess.Project,
+							sess.UserPrompt,
+							msg.Summarize.LastUserMessage,
+							msg.Summarize.LastAssistantMessage,
+						)
+						if err != nil {
+							log.Error().Err(err).
+								Int64("sessionId", sess.SessionDBID).
+								Msg("Failed to process summary")
+						}
+						// Delete session after summary
+						s.sessionManager.DeleteSession(sess.SessionDBID)
 					}
-					// Delete session after summary
-					s.sessionManager.DeleteSession(sess.SessionDBID)
 				}
-			}
+			}(sess, msg)
 		}
-
-		s.broadcastProcessingStatus()
 	}
+
+	// Wait for all goroutines to complete
+	wg.Wait()
+
+	// Broadcast status after processing
+	s.broadcastProcessingStatus()
 }
 
 // Shutdown gracefully shuts down the service.

ui/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "claude-mnemonic-dashboard",
-  "version": "v0.6.1-4-g0a0dfc1-dirty",
+  "version": "v0.6.1-5-gcd14ba8-dirty",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "claude-mnemonic-dashboard",
-      "version": "v0.6.1-4-g0a0dfc1-dirty",
+      "version": "v0.6.1-5-gcd14ba8-dirty",
       "dependencies": {
         "vue": "^3.5.13"
       },

ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mnemonic-dashboard",
-  "version": "v0.6.1-4-g0a0dfc1-dirty",
+  "version": "v0.6.1-5-gcd14ba8-dirty",
   "private": true,
   "type": "module",
   "scripts": {