diff --git a/autocomplete/fish_autocomplete b/autocomplete/fish_autocomplete
index 1161da58..44fb2e84 100644
--- a/autocomplete/fish_autocomplete
+++ b/autocomplete/fish_autocomplete
@@ -87,6 +87,7 @@ complete -c lk -n '__fish_seen_subcommand_from agent a; and __fish_seen_subcomma
 complete -c lk -n '__fish_seen_subcommand_from agent a; and __fish_seen_subcommand_from deploy' -f -l ignore-empty-secrets -d 'If set, will skip environment variables with empty values from secrets files instead of failing'
 complete -c lk -n '__fish_seen_subcommand_from agent a; and __fish_seen_subcommand_from deploy' -f -l image -r -d 'Pre-built image from the local Docker daemon (e.g. myimage:latest). Requires Docker.'
 complete -c lk -n '__fish_seen_subcommand_from agent a; and __fish_seen_subcommand_from deploy' -f -l image-tar -r -d 'Pre-built image from an OCI tar file (e.g. ./image.tar). No Docker daemon required.'
+complete -c lk -n '__fish_seen_subcommand_from agent a; and __fish_seen_subcommand_from deploy' -f -l id -r -d '`ID` of the agent. If unset, and the livekit.toml file is present, will use the id found there.'
 complete -c lk -n '__fish_seen_subcommand_from agent a; and __fish_seen_subcommand_from deploy' -f -l help -s h -d 'show help'
 complete -x -c lk -n '__fish_seen_subcommand_from agent a; and __fish_seen_subcommand_from deploy; and not __fish_seen_subcommand_from help h' -a 'help' -d 'Shows a list of commands or help for one command'
 complete -x -c lk -n '__fish_seen_subcommand_from agent a; and not __fish_seen_subcommand_from init create dockerfile config deploy status update restart rollback logs tail delete destroy versions list secrets update-secrets private-link start dev console daemon simulate help h' -a 'status' -d 'Get the status of an agent'
diff --git a/cmd/lk/agent.go b/cmd/lk/agent.go
index a61f6cb5..14f9ca74 100644
--- a/cmd/lk/agent.go
+++ b/cmd/lk/agent.go
@@ -229,6 +229,7 @@ var (
 						skipSDKCheckFlag,
 						agentPrebuiltImageFlag,
 						agentPrebuiltImageTarFlag,
+						idFlag(false),
 					},
 					// NOTE: since secrets may contain commas, or indeed any special character we might want to treat as a flag separator,
 					// we disable it entirely here and require multiple --secrets flags to be used.
diff --git a/cmd/lk/agent_test.go b/cmd/lk/agent_test.go
index 1d2551f6..4c21c577 100644
--- a/cmd/lk/agent_test.go
+++ b/cmd/lk/agent_test.go
@@ -398,6 +398,29 @@ func TestQuietFlagAlias(t *testing.T) {
 // "Skipped N empty secret(s)" breadcrumb) is suppressed when the Printer is quiet, and
 // that the --silent alias drives the same suppression as --quiet — end to end through the
 // real global flag and the Printer, with no code in requireSecrets checking the flag.
+func TestAgentDeployRegistersIDFlag(t *testing.T) {
+	var deploy *cli.Command
+	for _, cmd := range AgentCommands {
+		if cmd.Name != "agent" {
+			continue
+		}
+		for _, sub := range cmd.Commands {
+			if sub.Name == "deploy" {
+				deploy = sub
+				break
+			}
+		}
+	}
+	require.NotNil(t, deploy, "deploy command should be registered")
+
+	for _, flag := range deploy.Flags {
+		if flag.Names()[0] == "id" {
+			return
+		}
+	}
+	t.Fatalf("deploy command should register --id flag")
+}
+
 func TestRequireSecrets_QuietSuppressesStatus(t *testing.T) {
 	tests := []struct {
 		name           string