diff --git a/src/cli-client-commands.ts b/src/cli-client-commands.ts
index f462196e..74f9d78e 100644
--- a/src/cli-client-commands.ts
+++ b/src/cli-client-commands.ts
@@ -2,6 +2,7 @@ import fs from 'node:fs';
 import os from 'node:os';
 import path from 'node:path';
 import type { CliFlags } from './utils/command-schema.ts';
+import type { CommandName } from './core/command-names.ts';
 import { formatScreenshotDiffText, formatSnapshotText, printJson } from './utils/output.ts';
 import { AppError } from './utils/errors.ts';
 import {
@@ -247,7 +248,7 @@ const clientCommandHandlers: Partial<Record<string, ClientCommandHandler>> = {
     }
     return true;
   },
-};
+} satisfies Partial<Record<CommandName, ClientCommandHandler>>;
 
 async function runDeployCommand(
   command: 'install' | 'reinstall',
diff --git a/src/client.ts b/src/client.ts
index 3f6d145c..58fa1b59 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -1,6 +1,7 @@
 import { sendToDaemon } from './daemon-client.ts';
 import { prepareMetroRuntime } from './client-metro.ts';
 import { AppError } from './utils/errors.ts';
+import type { CommandName } from './core/command-names.ts';
 import {
   buildFlags,
   buildMeta,
@@ -44,7 +45,7 @@ export function createAgentDeviceClient(
   const transport = deps.transport ?? sendToDaemon;
 
   const execute = async (
-    command: string,
+    command: CommandName,
     positionals: string[] = [],
     options: InternalRequestOptions = {},
   ): Promise<Record<string, unknown>> => {
diff --git a/src/core/batch.ts b/src/core/batch.ts
index 830bcac8..8b3f5c7b 100644
--- a/src/core/batch.ts
+++ b/src/core/batch.ts
@@ -1,11 +1,12 @@
 import { AppError } from '../utils/errors.ts';
 import type { BatchStep, CommandFlags } from './dispatch.ts';
+import type { CommandName } from './command-names.ts';
 
 export const DEFAULT_BATCH_MAX_STEPS = 100;
 const BATCH_BLOCKED_COMMANDS = new Set(['batch', 'replay']);
 
 export type NormalizedBatchStep = {
-  command: string;
+  command: CommandName;
   positionals: string[];
   flags: Partial<CommandFlags>;
   runtime?: unknown;
@@ -13,7 +14,7 @@ export type NormalizedBatchStep = {
 
 export type BatchStepResult = {
   step: number;
-  command: string;
+  command: CommandName;
   ok: true;
   data: Record<string, unknown>;
   durationMs: number;
@@ -82,7 +83,7 @@ export function validateAndNormalizeBatchSteps(
       throw new AppError('INVALID_ARGS', `Batch step ${index + 1} runtime must be an object.`);
     }
     normalized.push({
-      command,
+      command: command as CommandName,
       positionals: positionals as string[],
       flags: (step.flags ?? {}) as Partial<CommandFlags>,
       runtime: step.runtime,
diff --git a/src/core/capabilities.ts b/src/core/capabilities.ts
index 1c436bd2..d5742c84 100644
--- a/src/core/capabilities.ts
+++ b/src/core/capabilities.ts
@@ -1,4 +1,5 @@
 import type { DeviceInfo } from '../utils/device.ts';
+import type { CommandName } from './command-names.ts';
 
 type KindMatrix = {
   simulator?: boolean;
@@ -144,7 +145,7 @@ const COMMAND_CAPABILITY_MATRIX: Record<string, CommandCapability> = {
     ios: { simulator: true, device: true },
     android: { emulator: true, device: true, unknown: true },
   },
-};
+} satisfies Partial<Record<CommandName, CommandCapability>>;
 
 export function isCommandSupportedOnDevice(command: string, device: DeviceInfo): boolean {
   const capability = COMMAND_CAPABILITY_MATRIX[command];
diff --git a/src/core/command-names.ts b/src/core/command-names.ts
new file mode 100644
index 00000000..e3b3a282
--- /dev/null
+++ b/src/core/command-names.ts
@@ -0,0 +1,31 @@
+/**
+ * Canonical command name type used throughout agent-device.
+ *
+ * CLI command names are derived from `COMMAND_SCHEMAS` keys.
+ * Daemon-internal names are listed as a small separate union.
+ *
+ * `DaemonRequest.command` intentionally stays `string` because it represents
+ * untrusted input from wire boundaries.  The value of `CommandName` comes from
+ * typed lookup-table keys and internal function parameters.
+ */
+
+import type { CliCommandName } from '../utils/command-schema.ts';
+
+const DAEMON_INTERNAL_COMMANDS = [
+  'install_source',
+  'lease_allocate',
+  'lease_heartbeat',
+  'lease_release',
+  'release_materialized_paths',
+  'session_list',
+] as const;
+
+type DaemonInternalCommandName = (typeof DAEMON_INTERNAL_COMMANDS)[number];
+
+export type CommandName = CliCommandName | DaemonInternalCommandName;
+
+/** CLI aliases that are normalized before reaching command dispatch. */
+export const COMMAND_ALIASES: Partial<Record<string, CommandName>> = {
+  'long-press': 'longpress',
+  metrics: 'perf',
+};
diff --git a/src/core/dispatch.ts b/src/core/dispatch.ts
index 0453fedc..1a25d4bd 100644
--- a/src/core/dispatch.ts
+++ b/src/core/dispatch.ts
@@ -2,6 +2,7 @@ import { promises as fs } from 'node:fs';
 import pathModule from 'node:path';
 import { AppError } from '../utils/errors.ts';
 import type { DeviceInfo } from '../utils/device.ts';
+import type { CommandName } from './command-names.ts';
 import {
   dismissAndroidKeyboard,
   getAndroidKeyboardState,
@@ -30,7 +31,7 @@ export { resolveTargetDevice } from './dispatch-resolve.ts';
 export { shouldUseIosTapSeries, shouldUseIosDragSeries };
 
 export type BatchStep = {
-  command: string;
+  command: CommandName;
   positionals?: string[];
   flags?: Partial<CommandFlags>;
   runtime?: unknown;
@@ -42,7 +43,7 @@ export type CommandFlags = Omit<CliFlags, 'json' | 'help' | 'version' | 'batchSt
 
 export async function dispatchCommand(
   device: DeviceInfo,
-  command: string,
+  command: CommandName,
   positionals: string[],
   outPath?: string,
   context?: {
diff --git a/src/daemon/handlers/session-close.ts b/src/daemon/handlers/session-close.ts
index f7ec12b6..ea0690cf 100644
--- a/src/daemon/handlers/session-close.ts
+++ b/src/daemon/handlers/session-close.ts
@@ -1,6 +1,7 @@
 import { normalizeError } from '../../utils/errors.ts';
 import { runCmd } from '../../utils/exec.ts';
 import type { DeviceInfo } from '../../utils/device.ts';
+import type { CommandName } from '../../core/command-names.ts';
 import { contextFromFlags } from '../context.ts';
 import type { DaemonRequest, DaemonResponse, SessionState } from '../types.ts';
 import { SessionStore } from '../session-store.ts';
@@ -77,7 +78,7 @@ export async function handleCloseCommand(params: {
   sessionStore: SessionStore;
   dispatch: (
     device: DeviceInfo,
-    command: string,
+    command: CommandName,
     positionals: string[],
     out?: string,
     context?: Record<string, unknown>,
diff --git a/src/daemon/handlers/session.ts b/src/daemon/handlers/session.ts
index 7820f4db..d735f97d 100644
--- a/src/daemon/handlers/session.ts
+++ b/src/daemon/handlers/session.ts
@@ -5,6 +5,7 @@ import {
   type BatchStep,
   type CommandFlags,
 } from '../../core/dispatch.ts';
+import type { CommandName } from '../../core/command-names.ts';
 import { isCommandSupportedOnDevice } from '../../core/capabilities.ts';
 import { AppError, asAppError, normalizeError } from '../../utils/errors.ts';
 import { normalizePlatformSelector, type DeviceInfo } from '../../utils/device.ts';
@@ -117,7 +118,7 @@ async function runSessionOrSelectorDispatch(params: {
   ensureReady: typeof ensureDeviceReady;
   resolveDevice: typeof resolveTargetDevice;
   dispatch: typeof dispatchCommand;
-  command: string;
+  command: CommandName;
   positionals: string[];
   recordPositionals?: string[];
   deriveNextSession?: (
diff --git a/src/daemon/http-server.ts b/src/daemon/http-server.ts
index cff8d59c..ce4a6e08 100644
--- a/src/daemon/http-server.ts
+++ b/src/daemon/http-server.ts
@@ -2,6 +2,7 @@ import http, { type IncomingHttpHeaders } from 'node:http';
 import fs from 'node:fs';
 import { AppError, normalizeError } from '../utils/errors.ts';
 import type { DaemonInstallSource, DaemonRequest, DaemonResponse } from './types.ts';
+import type { CommandName } from '../core/command-names.ts';
 import { normalizeTenantId } from './config.ts';
 import {
   clearRequestCanceled,
@@ -78,7 +79,7 @@ const LEASE_RPC_METHOD_TO_COMMAND: Record<
   'agent-device.lease.heartbeat': 'lease_heartbeat',
   'agent_device.lease.release': 'lease_release',
   'agent-device.lease.release': 'lease_release',
-};
+} satisfies Record<string, CommandName>;
 const SUPPORTED_RPC_METHODS = new Set([
   ...COMMAND_RPC_METHODS,
   ...INSTALL_FROM_SOURCE_RPC_METHODS,
diff --git a/src/daemon/request-router.ts b/src/daemon/request-router.ts
index 2faf453e..27754bc3 100644
--- a/src/daemon/request-router.ts
+++ b/src/daemon/request-router.ts
@@ -27,14 +27,15 @@ import {
 } from '../utils/diagnostics.ts';
 import { resolveLeaseScope } from './lease-context.ts';
 import type { LeaseRegistry } from './lease-registry.ts';
+import type { CommandName } from '../core/command-names.ts';
 
-const selectorValidationExemptCommands = new Set([
+const selectorValidationExemptCommands = new Set<string>([
   'session_list',
   'devices',
   'ensure-simulator',
   'release_materialized_paths',
-]);
-const leaseAdmissionExemptCommands = new Set([
+] as const satisfies readonly CommandName[]);
+const leaseAdmissionExemptCommands = new Set<string>([
   'session_list',
   'devices',
   'ensure-simulator',
@@ -42,7 +43,7 @@ const leaseAdmissionExemptCommands = new Set([
   'lease_allocate',
   'lease_heartbeat',
   'lease_release',
-]);
+] as const satisfies readonly CommandName[]);
 
 function contextFromFlags(
   logPath: string,
@@ -344,7 +345,7 @@ export function createRequestHandler(
             command === 'screenshot' && resolvedOut
               ? { ...(lockedReq.flags ?? {}), out: resolvedOut }
               : (lockedReq.flags ?? {});
-          const data = await dispatch(session.device, command, resolvedPositionals, resolvedOut, {
+          const data = await dispatch(session.device, command as CommandName, resolvedPositionals, resolvedOut, {
             ...contextFromFlags(
               logPath,
               lockedReq.flags,
diff --git a/src/utils/args.ts b/src/utils/args.ts
index 5eafb090..ff30c856 100644
--- a/src/utils/args.ts
+++ b/src/utils/args.ts
@@ -10,6 +10,7 @@ import {
   type FlagKey,
 } from './command-schema.ts';
 import { isFlagSupportedForCommand } from './cli-option-schema.ts';
+import { COMMAND_ALIASES } from '../core/command-names.ts';
 
 type ParsedArgs = {
   command: string | null;
@@ -304,9 +305,7 @@ export function usageForCommand(command: string): string | null {
 }
 
 function normalizeCommandAlias(command: string): string {
-  if (command === 'long-press') return 'longpress';
-  if (command === 'metrics') return 'perf';
-  return command;
+  return COMMAND_ALIASES[command] ?? command;
 }
 
 function mergeDefinedFlags<T extends Record<string, unknown>>(target: T, source: Partial<T>): T {
diff --git a/src/utils/command-schema.ts b/src/utils/command-schema.ts
index 3cf64188..e3b885f9 100644
--- a/src/utils/command-schema.ts
+++ b/src/utils/command-schema.ts
@@ -743,7 +743,7 @@ export const GLOBAL_FLAG_KEYS = new Set<FlagKey>([
   'noRecord',
 ]);
 
-const COMMAND_SCHEMAS: Record<string, CommandSchema> = {
+const commandSchemaEntries = {
   boot: {
     description: 'Ensure target device/simulator is booted and ready',
     positionalArgs: [],
@@ -1049,7 +1049,11 @@ const COMMAND_SCHEMAS: Record<string, CommandSchema> = {
     allowedFlags: [],
     skipCapabilityCheck: true,
   },
-};
+} satisfies Record<string, CommandSchema>;
+
+export type CliCommandName = keyof typeof commandSchemaEntries;
+
+const COMMAND_SCHEMAS: Record<string, CommandSchema> = commandSchemaEntries;
 
 const flagDefinitionByName = new Map<string, FlagDefinition>();
 const flagDefinitionsByKey = new Map<FlagKey, FlagDefinition[]>();