diff --git a/pkg/agentic/commands.go b/pkg/agentic/commands.go
index 14907f1..c5f535c 100644
--- a/pkg/agentic/commands.go
+++ b/pkg/agentic/commands.go
@@ -31,6 +31,7 @@ func (s *PrepSubsystem) registerCommands(ctx context.Context) {
 	c.Command("brain/ingest", core.Command{Description: "Bulk ingest memories into OpenBrain", Action: s.cmdBrainIngest})
 	c.Command("brain/seed-memory", core.Command{Description: "Import markdown memories into OpenBrain from a project memory directory", Action: s.cmdBrainSeedMemory})
 	c.Command("brain/list", core.Command{Description: "List memories in OpenBrain", Action: s.cmdBrainList})
+	c.Command("brain/forget", core.Command{Description: "Forget a memory in OpenBrain", Action: s.cmdBrainForget})
 	c.Command("lang/detect", core.Command{Description: "Detect the primary language for a repository or workspace", Action: s.cmdLangDetect})
 	c.Command("lang/list", core.Command{Description: "List supported language identifiers", Action: s.cmdLangList})
 	c.Command("plan-cleanup", core.Command{Description: "Permanently delete archived plans past the retention period", Action: s.cmdPlanCleanup})
@@ -368,6 +369,31 @@ func (s *PrepSubsystem) cmdBrainList(options core.Options) core.Result {
 	return core.Result{Value: output, OK: true}
 }
 
+// result := c.Command("brain/forget").Run(ctx, core.NewOptions(core.Option{Key: "_arg", Value: "mem-1"}))
+func (s *PrepSubsystem) cmdBrainForget(options core.Options) core.Result {
+	id := optionStringValue(options, "id", "_arg")
+	if id == "" {
+		core.Print(nil, "usage: core-agent brain forget <memory-id> [--reason=\"superseded\"]")
+		return core.Result{Value: core.E("agentic.cmdBrainForget", "memory id is required", nil), OK: false}
+	}
+
+	result := s.Core().Action("brain.forget").Run(s.commandContext(), core.NewOptions(
+		core.Option{Key: "id", Value: id},
+		core.Option{Key: "reason", Value: optionStringValue(options, "reason")},
+	))
+	if !result.OK {
+		err := commandResultError("agentic.cmdBrainForget", result)
+		core.Print(nil, "error: %v", err)
+		return core.Result{Value: err, OK: false}
+	}
+
+	core.Print(nil, "forgotten: %s", id)
+	if reason := optionStringValue(options, "reason"); reason != "" {
+		core.Print(nil, "reason:    %s", reason)
+	}
+	return core.Result{Value: result.Value, OK: true}
+}
+
 func (s *PrepSubsystem) cmdStatus(options core.Options) core.Result {
 	workspaceRoot := WorkspaceRoot()
 	filesystem := s.Core().Fs()
diff --git a/pkg/agentic/commands_test.go b/pkg/agentic/commands_test.go
index bd0e245..43cabd2 100644
--- a/pkg/agentic/commands_test.go
+++ b/pkg/agentic/commands_test.go
@@ -287,6 +287,54 @@ func TestCommands_CmdBrainList_Ugly_InvalidOutput(t *testing.T) {
 	assert.Contains(t, err.Error(), "invalid brain list output")
 }
 
+func TestCommands_CmdBrainForget_Good(t *testing.T) {
+	s, c := testPrepWithCore(t, nil)
+	c.Action("brain.forget", func(_ context.Context, options core.Options) core.Result {
+		assert.Equal(t, "mem-1", options.String("id"))
+		assert.Equal(t, "superseded", options.String("reason"))
+		return core.Result{Value: map[string]any{
+			"success":   true,
+			"forgotten": "mem-1",
+		}, OK: true}
+	})
+
+	output := captureStdout(t, func() {
+		result := s.cmdBrainForget(core.NewOptions(
+			core.Option{Key: "_arg", Value: "mem-1"},
+			core.Option{Key: "reason", Value: "superseded"},
+		))
+		require.True(t, result.OK)
+	})
+
+	assert.Contains(t, output, "forgotten: mem-1")
+	assert.Contains(t, output, "reason:    superseded")
+}
+
+func TestCommands_CmdBrainForget_Bad_MissingID(t *testing.T) {
+	s, _ := testPrepWithCore(t, nil)
+
+	result := s.cmdBrainForget(core.NewOptions())
+
+	require.False(t, result.OK)
+	err, ok := result.Value.(error)
+	require.True(t, ok)
+	assert.Contains(t, err.Error(), "memory id is required")
+}
+
+func TestCommands_CmdBrainForget_Ugly_ActionFailure(t *testing.T) {
+	s, c := testPrepWithCore(t, nil)
+	c.Action("brain.forget", func(_ context.Context, _ core.Options) core.Result {
+		return core.Result{Value: core.E("brain.forget", "failed to forget memory", nil), OK: false}
+	})
+
+	result := s.cmdBrainForget(core.NewOptions(core.Option{Key: "_arg", Value: "mem-1"}))
+
+	require.False(t, result.OK)
+	err, ok := result.Value.(error)
+	require.True(t, ok)
+	assert.Contains(t, err.Error(), "failed to forget memory")
+}
+
 func TestCommandsforge_CmdIssueCreate_Bad_APIError(t *testing.T) {
 	callCount := 0
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
diff --git a/pkg/agentic/prep_test.go b/pkg/agentic/prep_test.go
index 652864a..1987be1 100644
--- a/pkg/agentic/prep_test.go
+++ b/pkg/agentic/prep_test.go
@@ -624,6 +624,7 @@ func TestPrep_OnStartup_Good_RegistersGenerateCommand(t *testing.T) {
 	assert.Contains(t, c.Commands(), "brain/ingest")
 	assert.Contains(t, c.Commands(), "brain/seed-memory")
 	assert.Contains(t, c.Commands(), "brain/list")
+	assert.Contains(t, c.Commands(), "brain/forget")
 	assert.Contains(t, c.Commands(), "lang/detect")
 	assert.Contains(t, c.Commands(), "lang/list")
 	assert.Contains(t, c.Commands(), "plan-cleanup")