diff --git a/src/trader/trader-commands.test.ts b/src/trader/trader-commands.test.ts
index 465b842..5a1f832 100644
--- a/src/trader/trader-commands.test.ts
+++ b/src/trader/trader-commands.test.ts
@@ -11,6 +11,7 @@ import {
   resolveTenantAddress,
   createTraderCommand,
   buildCreateIntentParams,
+  buildWithdrawParams,
 } from './trader-commands.js';
 
 describe('parseTimeout (trader)', () => {
@@ -79,7 +80,7 @@ describe('resolveTenantAddress', () => {
 });
 
 describe('createTraderCommand', () => {
-  it('exposes the 6 controller-scoped trader subcommands', () => {
+  it('exposes the 7 controller-scoped trader subcommands', () => {
     const trader = createTraderCommand();
     const names = trader.commands.map((c) => c.name()).sort();
     // No `status` here: STATUS is system-scoped per Unicity
@@ -92,6 +93,7 @@ describe('createTraderCommand', () => {
       'list-intents',
       'portfolio',
       'set-strategy',
+      'withdraw',
     ]);
   });
 
@@ -287,3 +289,73 @@ describe('buildCreateIntentParams (wire shape)', () => {
     expect(result.params['volume_max']).toBe(huge);
   });
 });
+
+describe('buildWithdrawParams (wire shape)', () => {
+  const baseOpts = {
+    asset: 'UCT',
+    amount: '1000',
+    toAddress: '@alice',
+  };
+
+  it('emits asset / amount / to_address (snake_case wire fields)', () => {
+    const result = buildWithdrawParams(baseOpts);
+    if ('error' in result) throw new Error(result.error);
+    expect(result.params['asset']).toBe('UCT');
+    expect(result.params['amount']).toBe('1000');
+    expect(result.params['to_address']).toBe('@alice');
+    expect(result.params).not.toHaveProperty('toAddress');
+  });
+
+  it('preserves bigint-string amount verbatim (no coercion to Number)', () => {
+    const huge = '99999999999999999999999999';
+    const result = buildWithdrawParams({ ...baseOpts, amount: huge });
+    if ('error' in result) throw new Error(result.error);
+    expect(result.params['amount']).toBe(huge);
+  });
+
+  it('rejects empty asset', () => {
+    const result = buildWithdrawParams({ ...baseOpts, asset: '' });
+    expect('error' in result).toBe(true);
+    if (!('error' in result)) return;
+    expect(result.error).toMatch(/asset is required/);
+  });
+
+  it('rejects whitespace-only asset', () => {
+    const result = buildWithdrawParams({ ...baseOpts, asset: '   ' });
+    expect('error' in result).toBe(true);
+  });
+
+  it('rejects empty amount', () => {
+    const result = buildWithdrawParams({ ...baseOpts, amount: '' });
+    expect('error' in result).toBe(true);
+    if (!('error' in result)) return;
+    expect(result.error).toMatch(/amount is required/);
+  });
+
+  it('rejects zero, negative, decimal, scientific notation, leading-zero amounts', () => {
+    for (const bad of ['0', '-100', '1.5', '1e6', '01000', 'abc']) {
+      const r = buildWithdrawParams({ ...baseOpts, amount: bad });
+      expect('error' in r, `expected error for amount="${bad}"`).toBe(true);
+    }
+  });
+
+  it('rejects empty to-address', () => {
+    const result = buildWithdrawParams({ ...baseOpts, toAddress: '' });
+    expect('error' in result).toBe(true);
+    if (!('error' in result)) return;
+    expect(result.error).toMatch(/to-address is required/);
+  });
+
+  it('accepts all three address forms (@nametag, DIRECT://hex, raw hex)', () => {
+    for (const addr of [
+      '@alice',
+      'DIRECT://0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef',
+      '0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef',
+    ]) {
+      const r = buildWithdrawParams({ ...baseOpts, toAddress: addr });
+      expect('error' in r, `expected accept for to-address="${addr}"`).toBe(false);
+      if ('error' in r) continue;
+      expect(r.params['to_address']).toBe(addr);
+    }
+  });
+});
diff --git a/src/trader/trader-commands.ts b/src/trader/trader-commands.ts
index 237c917..a25139c 100644
--- a/src/trader/trader-commands.ts
+++ b/src/trader/trader-commands.ts
@@ -65,6 +65,12 @@ interface SetStrategyOpts {
   trustedEscrows?: string;
 }
 
+interface WithdrawOpts {
+  asset: string;
+  amount: string;
+  toAddress: string;
+}
+
 // =============================================================================
 // Helpers
 // =============================================================================
@@ -334,6 +340,62 @@ async function handlePortfolio(cmd: Command): Promise<void> {
 // rely on `sphere trader portfolio`/`list-intents` succeeding as an
 // implicit liveness signal.
 
+/**
+ * Build the wire payload for WITHDRAW_TOKEN. Pure function for unit-testing.
+ *
+ * Validation here mirrors the trader-side handler in
+ * trader-service/src/trader/trader-command-handler.ts:633: asset must be
+ * non-empty, amount must be a positive bigint string, to_address must
+ * be a valid address. The trader re-validates everything; we catch
+ * the trivial cases at the CLI layer for a faster local error path.
+ */
+export function buildWithdrawParams(
+  opts: WithdrawOpts,
+): { readonly params: Record<string, unknown> } | { readonly error: string } {
+  if (!opts.asset || opts.asset.trim() === '') {
+    return { error: '--asset is required (e.g. UCT, USDU, or hex coin id)' };
+  }
+  if (!opts.amount) {
+    return { error: '--amount is required (positive integer in smallest units)' };
+  }
+  // Strict positive-integer parse — reject `1e6`-style scientific
+  // notation, leading zeros, signs, decimals. The trader uses
+  // safeParseBigint which is similarly strict.
+  if (!/^[1-9]\d*$/.test(opts.amount)) {
+    return {
+      error: `--amount must be a positive integer in smallest units (got "${opts.amount}")`,
+    };
+  }
+  if (!opts.toAddress || opts.toAddress.trim() === '') {
+    return { error: '--to-address is required' };
+  }
+  // Trim before forwarding so a leading/trailing space in the operator's
+  // input doesn't reach the wire (where the trader's address regex
+  // would reject it as INVALID_PARAM with a remote-side error rather
+  // than a local CLI message). The empty-after-trim cases were already
+  // caught above; this pass just normalizes content of valid inputs.
+  return {
+    params: {
+      asset: opts.asset.trim(),
+      amount: opts.amount,
+      to_address: opts.toAddress.trim(),
+    },
+  };
+}
+
+async function handleWithdraw(cmd: Command, opts: WithdrawOpts): Promise<void> {
+  await runWithTransport(cmd, async ({ transport, json }) => {
+    const built = buildWithdrawParams(opts);
+    if ('error' in built) {
+      writeStderr(built.error);
+      process.exitCode = 1;
+      return;
+    }
+    const response = await transport.sendCommand('WITHDRAW_TOKEN', built.params);
+    emitResult(json, response);
+  });
+}
+
 async function handleSetStrategy(cmd: Command, opts: SetStrategyOpts): Promise<void> {
   await runWithTransport(cmd, async ({ transport, json }) => {
     const params: Record<string, unknown> = {};
@@ -439,6 +501,16 @@ export function createTraderCommand(): Command {
       await handleSetStrategy(this, opts);
     });
 
+  trader
+    .command('withdraw')
+    .description('Withdraw a token from the trader to an external address (ACP WITHDRAW_TOKEN)')
+    .requiredOption('--asset <symbol>', 'Asset symbol (e.g. UCT, USDU) or hex coin id')
+    .requiredOption('--amount <bigint>', 'Amount to withdraw in smallest units (string-encoded bigint, must be > 0)')
+    .requiredOption('--to-address <address>', 'Destination address: @nametag (lowercase alphanumeric + _/-, 1-30 chars), DIRECT://<64-80 hex>, or PROXY://<64-80 hex>')
+    .action(async function (this: Command, opts: WithdrawOpts) {
+      await handleWithdraw(this, opts);
+    });
+
   // Attach the shared-options help text to every subcommand.
   for (const sub of trader.commands) {
     sub.addHelpText('after', `\n${inheritedHelp}`);