diff --git a/internal/session/attempts.go b/internal/session/attempts.go
new file mode 100644
index 0000000..7a79cf5
--- /dev/null
+++ b/internal/session/attempts.go
@@ -0,0 +1,26 @@
+// internal/session/attempts.go
+package session
+
+import iexec "github.com/mathiasbq/supervisor/internal/exec"
+
+// AttemptsFrom converts exec.AttemptRecord slice to session.Attempt slice
+// for writing into a session JSONL entry.
+func AttemptsFrom(records []iexec.AttemptRecord) []Attempt {
+	if len(records) == 0 {
+		return nil
+	}
+	out := make([]Attempt, len(records))
+	for i, r := range records {
+		out[i] = Attempt{
+			Attempt:    i + 1,
+			Model:      r.Model,
+			Tier:       r.Tier,
+			DurationMs: r.DurationMs,
+			WarmStart:  r.WarmStart,
+			Verdict:    r.Verdict,
+			Feedback:   r.Feedback,
+			Verified:   r.Verdict == "accept",
+		}
+	}
+	return out
+}
diff --git a/internal/session/attempts_test.go b/internal/session/attempts_test.go
new file mode 100644
index 0000000..851a45e
--- /dev/null
+++ b/internal/session/attempts_test.go
@@ -0,0 +1,37 @@
+package session_test
+
+import (
+	"testing"
+
+	"github.com/mathiasbq/supervisor/internal/exec"
+	"github.com/mathiasbq/supervisor/internal/session"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAttemptsFromEmpty(t *testing.T) {
+	result := session.AttemptsFrom(nil)
+	assert.Empty(t, result)
+}
+
+func TestAttemptsFromSetsIndex(t *testing.T) {
+	records := []exec.AttemptRecord{
+		{Model: "ollama/phi4", Tier: "local", DurationMs: 1200, WarmStart: true, Verdict: "escalate", Feedback: "too vague"},
+		{Model: "claude-sonnet-4-6", Tier: "subagent", DurationMs: 3400, WarmStart: false, Verdict: "accept"},
+	}
+	result := session.AttemptsFrom(records)
+	require.Len(t, result, 2)
+
+	assert.Equal(t, 1, result[0].Attempt)
+	assert.Equal(t, "ollama/phi4", result[0].Model)
+	assert.Equal(t, "local", result[0].Tier)
+	assert.Equal(t, int64(1200), result[0].DurationMs)
+	assert.True(t, result[0].WarmStart)
+	assert.Equal(t, "escalate", result[0].Verdict)
+	assert.Equal(t, "too vague", result[0].Feedback)
+	assert.False(t, result[0].Verified)
+
+	assert.Equal(t, 2, result[1].Attempt)
+	assert.Equal(t, "claude-sonnet-4-6", result[1].Model)
+	assert.True(t, result[1].Verified)
+}