diff --git a/internal/skills/spec/handlers.go b/internal/skills/spec/handlers.go
index 2c3dc2d..5e4378e 100644
--- a/internal/skills/spec/handlers.go
+++ b/internal/skills/spec/handlers.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"time"
 
 	iexec "github.com/mathiasbq/supervisor/internal/exec"
 	"github.com/mathiasbq/supervisor/internal/session"
@@ -48,11 +49,12 @@ func (s *Skill) Handle(ctx context.Context, tool string, args json.RawMessage) (
 		"phase: spec\nproject_root: %s\nrequirements: %s\noutput_path: %s\ncontext: %s\nmodel: %s",
 		a.ProjectRoot, a.Requirements, outputPath, a.Context, model,
 	)
-	task = s.prependHistory(a.SessionID, "spec", task)
+	task = session.PrependHistory(s.cfg.SessionsDir, a.SessionID, "spec", task)
 
 	if s.cfg.ExecutorFn == nil {
 		return nil, fmt.Errorf("no executor configured")
 	}
+	t0 := time.Now()
 	result, err := s.cfg.ExecutorFn(ctx, iexec.Request{
 		SkillPrompt: s.cfg.SkillPrompt,
 		TaskPrompt:  task,
@@ -62,24 +64,26 @@ func (s *Skill) Handle(ctx context.Context, tool string, args json.RawMessage) (
 	if err != nil {
 		return nil, err
 	}
+
+	if a.SessionID != "" && s.cfg.SessionsDir != "" {
+		_ = session.Append(s.cfg.SessionsDir, a.SessionID, session.Entry{
+			SessionID:   a.SessionID,
+			Timestamp:   time.Now(),
+			Skill:       "spec",
+			Phase:       "spec",
+			ProjectRoot: a.ProjectRoot,
+			Attempts:    session.AttemptsFrom(result.Attempts),
+			FinalStatus: result.Status,
+			FilePath:    result.FilePath,
+			ModelUsed:   result.ModelUsed,
+			DurationMs:  time.Since(t0).Milliseconds(),
+			Message:     result.Message,
+		})
+	}
+
 	b, err := json.Marshal(result)
 	if err != nil {
 		return nil, fmt.Errorf("marshal result: %w", err)
 	}
 	return b, nil
 }
-
-func (s *Skill) prependHistory(sessionID, currentPhase, task string) string {
-	if sessionID == "" || s.cfg.SessionsDir == "" {
-		return task
-	}
-	entries, err := session.Read(s.cfg.SessionsDir, sessionID)
-	if err != nil || len(entries) == 0 {
-		return task
-	}
-	history := session.FormatHistory(entries, currentPhase)
-	if history == "" {
-		return task
-	}
-	return history + "\n---\n\n" + task
-}