diff --git a/internal/hook/config.go b/internal/hook/config.go
new file mode 100644
index 0000000..108adfb
--- /dev/null
+++ b/internal/hook/config.go
@@ -0,0 +1,62 @@
+package hook
+
+import (
+	"fmt"
+	"log/slog"
+	"time"
+
+	"somegit.dev/Owlibou/gnoma/internal/config"
+)
+
+// toolScopedEvents are the events where ToolPattern applies.
+var toolScopedEvents = map[EventType]bool{
+	PreToolUse:  true,
+	PostToolUse: true,
+}
+
+// ParseHookDefs converts raw config.HookConfig entries to validated HookDefs.
+func ParseHookDefs(cfgs []config.HookConfig) ([]HookDef, error) {
+	defs := make([]HookDef, 0, len(cfgs))
+	for i, c := range cfgs {
+		event, err := ParseEventType(c.Event)
+		if err != nil {
+			return nil, fmt.Errorf("hook[%d] %q: %w", i, c.Name, err)
+		}
+
+		cmd, err := ParseCommandType(c.Type)
+		if err != nil {
+			return nil, fmt.Errorf("hook[%d] %q: %w", i, c.Name, err)
+		}
+
+		var timeout time.Duration
+		if c.Timeout != "" {
+			timeout, err = time.ParseDuration(c.Timeout)
+			if err != nil {
+				return nil, fmt.Errorf("hook[%d] %q: invalid timeout %q: %w", i, c.Name, c.Timeout, err)
+			}
+		}
+
+		toolPattern := c.ToolPattern
+		if toolPattern != "" && !toolScopedEvents[event] {
+			slog.Warn("hook tool_pattern ignored for non-tool event",
+				"hook", c.Name, "event", c.Event)
+			toolPattern = ""
+		}
+
+		def := HookDef{
+			Name:        c.Name,
+			Event:       event,
+			Command:     cmd,
+			Exec:        c.Exec,
+			Timeout:     timeout,
+			FailOpen:    c.FailOpen,
+			ToolPattern: toolPattern,
+		}
+		if err := def.Validate(); err != nil {
+			return nil, fmt.Errorf("hook[%d]: %w", i, err)
+		}
+
+		defs = append(defs, def)
+	}
+	return defs, nil
+}
diff --git a/internal/hook/config_test.go b/internal/hook/config_test.go
new file mode 100644
index 0000000..e0f35eb
--- /dev/null
+++ b/internal/hook/config_test.go
@@ -0,0 +1,161 @@
+package hook
+
+import (
+	"testing"
+	"time"
+
+	"somegit.dev/Owlibou/gnoma/internal/config"
+)
+
+func TestParseHookDefs_ValidConfig(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{
+			Name:        "log-tools",
+			Event:       "post_tool_use",
+			Type:        "command",
+			Exec:        "tee -a /tmp/log.jsonl",
+			Timeout:     "5s",
+			FailOpen:    true,
+			ToolPattern: "bash*",
+		},
+	}
+	defs, err := ParseHookDefs(cfgs)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(defs) != 1 {
+		t.Fatalf("len(defs) = %d, want 1", len(defs))
+	}
+	d := defs[0]
+	if d.Name != "log-tools" {
+		t.Errorf("Name = %q", d.Name)
+	}
+	if d.Event != PostToolUse {
+		t.Errorf("Event = %v, want PostToolUse", d.Event)
+	}
+	if d.Command != CommandTypeShell {
+		t.Errorf("Command = %v, want CommandTypeShell", d.Command)
+	}
+	if d.Exec != "tee -a /tmp/log.jsonl" {
+		t.Errorf("Exec = %q", d.Exec)
+	}
+	if d.Timeout != 5*time.Second {
+		t.Errorf("Timeout = %v, want 5s", d.Timeout)
+	}
+	if !d.FailOpen {
+		t.Error("FailOpen should be true")
+	}
+	if d.ToolPattern != "bash*" {
+		t.Errorf("ToolPattern = %q", d.ToolPattern)
+	}
+}
+
+func TestParseHookDefs_DefaultTimeout(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{Name: "h", Event: "pre_tool_use", Type: "command", Exec: "echo ok"},
+		// Timeout empty → default 30s
+	}
+	defs, err := ParseHookDefs(cfgs)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	// timeout() method returns 30s when Timeout field is zero
+	if defs[0].timeout() != 30*time.Second {
+		t.Errorf("default timeout = %v, want 30s", defs[0].timeout())
+	}
+}
+
+func TestParseHookDefs_InvalidEvent(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{Name: "h", Event: "bogus_event", Type: "command", Exec: "echo ok"},
+	}
+	_, err := ParseHookDefs(cfgs)
+	if err == nil {
+		t.Error("expected error for invalid event")
+	}
+}
+
+func TestParseHookDefs_InvalidType(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{Name: "h", Event: "pre_tool_use", Type: "webhook", Exec: "echo ok"},
+	}
+	_, err := ParseHookDefs(cfgs)
+	if err == nil {
+		t.Error("expected error for invalid type")
+	}
+}
+
+func TestParseHookDefs_InvalidTimeout(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{Name: "h", Event: "pre_tool_use", Type: "command", Exec: "echo ok", Timeout: "notaduration"},
+	}
+	_, err := ParseHookDefs(cfgs)
+	if err == nil {
+		t.Error("expected error for invalid timeout")
+	}
+}
+
+func TestParseHookDefs_EmptyName(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{Name: "", Event: "pre_tool_use", Type: "command", Exec: "echo ok"},
+	}
+	_, err := ParseHookDefs(cfgs)
+	if err == nil {
+		t.Error("expected error for empty name")
+	}
+}
+
+func TestParseHookDefs_EmptyExec(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{Name: "h", Event: "pre_tool_use", Type: "command", Exec: ""},
+	}
+	_, err := ParseHookDefs(cfgs)
+	if err == nil {
+		t.Error("expected error for empty exec")
+	}
+}
+
+func TestParseHookDefs_ToolPatternOnNonToolEvent_Ignored(t *testing.T) {
+	// ToolPattern on SessionStart is silently ignored (cleared).
+	cfgs := []config.HookConfig{
+		{Name: "h", Event: "session_start", Type: "command", Exec: "echo ok", ToolPattern: "bash*"},
+	}
+	defs, err := ParseHookDefs(cfgs)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if defs[0].ToolPattern != "" {
+		t.Errorf("ToolPattern should be cleared for non-tool events, got %q", defs[0].ToolPattern)
+	}
+}
+
+func TestParseHookDefs_Empty(t *testing.T) {
+	defs, err := ParseHookDefs(nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(defs) != 0 {
+		t.Errorf("expected empty slice, got %d", len(defs))
+	}
+}
+
+func TestParseHookDefs_MultipleTypes(t *testing.T) {
+	cfgs := []config.HookConfig{
+		{Name: "cmd-hook", Event: "pre_tool_use", Type: "command", Exec: "echo ok"},
+		{Name: "prompt-hook", Event: "pre_tool_use", Type: "prompt", Exec: "Is this safe? ALLOW or DENY."},
+		{Name: "agent-hook", Event: "pre_tool_use", Type: "agent", Exec: "Review this tool call."},
+	}
+	defs, err := ParseHookDefs(cfgs)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if defs[0].Command != CommandTypeShell {
+		t.Errorf("defs[0].Command = %v, want CommandTypeShell", defs[0].Command)
+	}
+	if defs[1].Command != CommandTypePrompt {
+		t.Errorf("defs[1].Command = %v, want CommandTypePrompt", defs[1].Command)
+	}
+	if defs[2].Command != CommandTypeAgent {
+		t.Errorf("defs[2].Command = %v, want CommandTypeAgent", defs[2].Command)
+	}
+}