diff --git a/src/utils/__tests__/usage-token-buffer.test.ts b/src/utils/__tests__/usage-token-buffer.test.ts
index e4f54615..b6cb7828 100644
--- a/src/utils/__tests__/usage-token-buffer.test.ts
+++ b/src/utils/__tests__/usage-token-buffer.test.ts
@@ -22,14 +22,29 @@ const require = createRequire(import.meta.url);
 const { execFileSync: realExecFileSync } = require('node:child_process') as { execFileSync: typeof childProcess.execFileSync };
 const mockedExecFileSync = childProcess.execFileSync as Mock;
 
+const ORIGINAL_CLAUDE_CONFIG_DIR = process.env.CLAUDE_CONFIG_DIR;
+const ORIGINAL_SECURESTORAGE_CONFIG_DIR = process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR;
+
 describe('getUsageToken dump-keychain behavior', () => {
     beforeEach(() => {
+        // The candidate scan under test only runs for the default profile, so
+        // shed any config-dir variables leaking in from the environment.
+        delete process.env.CLAUDE_CONFIG_DIR;
+        delete process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR;
         mockedExecFileSync.mockReset();
         mockedExecFileSync.mockImplementation(realExecFileSync);
         vi.spyOn(process, 'platform', 'get').mockReturnValue('darwin');
     });
 
     afterEach(() => {
+        delete process.env.CLAUDE_CONFIG_DIR;
+        delete process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR;
+        if (ORIGINAL_CLAUDE_CONFIG_DIR !== undefined) {
+            process.env.CLAUDE_CONFIG_DIR = ORIGINAL_CLAUDE_CONFIG_DIR;
+        }
+        if (ORIGINAL_SECURESTORAGE_CONFIG_DIR !== undefined) {
+            process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR = ORIGINAL_SECURESTORAGE_CONFIG_DIR;
+        }
         vi.restoreAllMocks();
         mockedExecFileSync.mockReset();
         mockedExecFileSync.mockImplementation(realExecFileSync);
diff --git a/src/utils/__tests__/usage-token.test.ts b/src/utils/__tests__/usage-token.test.ts
index eddbc2e2..9421f8d1 100644
--- a/src/utils/__tests__/usage-token.test.ts
+++ b/src/utils/__tests__/usage-token.test.ts
@@ -1,4 +1,5 @@
 import { execFileSync } from 'child_process';
+import { createHash } from 'crypto';
 import * as fs from 'fs';
 import * as path from 'path';
 import type { Mock } from 'vitest';
@@ -13,6 +14,7 @@ import {
 
 import * as claudeSettings from '../claude-settings';
 import {
+    getMacKeychainConfigDirService,
     getUsageToken,
     parseMacKeychainCredentialCandidates
 } from '../usage-fetch';
@@ -25,6 +27,30 @@ vi.mock('child_process', () => ({
 
 const CREDENTIALS_FILE = path.join('/fake/claude', '.credentials.json');
 const mockedExecFileSync = execFileSync as unknown as Mock;
+const ORIGINAL_CLAUDE_CONFIG_DIR = process.env.CLAUDE_CONFIG_DIR;
+const ORIGINAL_SECURESTORAGE_CONFIG_DIR = process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR;
+
+// The config-dir lookup keys off these variables, so every test starts from
+// the default (unset) profile regardless of the environment running the suite.
+beforeEach(() => {
+    delete process.env.CLAUDE_CONFIG_DIR;
+    delete process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR;
+});
+
+afterEach(() => {
+    delete process.env.CLAUDE_CONFIG_DIR;
+    delete process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR;
+    if (ORIGINAL_CLAUDE_CONFIG_DIR !== undefined) {
+        process.env.CLAUDE_CONFIG_DIR = ORIGINAL_CLAUDE_CONFIG_DIR;
+    }
+    if (ORIGINAL_SECURESTORAGE_CONFIG_DIR !== undefined) {
+        process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR = ORIGINAL_SECURESTORAGE_CONFIG_DIR;
+    }
+});
+
+function makeConfigDirService(configDir: string): string {
+    return `Claude Code-credentials-${createHash('sha256').update(configDir).digest('hex').slice(0, 8)}`;
+}
 
 function makeTokenPayload(token: string): string {
     return JSON.stringify({ claudeAiOauth: { accessToken: token } });
@@ -223,4 +249,78 @@ describe('getUsageToken', () => {
         expect(getUsageToken()).toBe('linux-file-token');
         expect(mockedExecFileSync).not.toHaveBeenCalled();
     });
+
+    it('reads the CLAUDE_CONFIG_DIR keychain service first and skips the plain service on a hit', () => {
+        const configDirService = makeConfigDirService('/fake/claude');
+
+        process.env.CLAUDE_CONFIG_DIR = '/fake/claude';
+        vi.spyOn(process, 'platform', 'get').mockReturnValue('darwin');
+        mockCredentialsFile();
+        mockedExecFileSync.mockImplementation((command: string, args?: string[]) => {
+            if (command === 'security' && args?.[0] === 'find-generic-password' && args[2] === configDirService) {
+                return makeTokenPayload('profile-token');
+            }
+
+            throw new Error(`Unexpected security args: ${args?.join(' ')}`);
+        });
+
+        expect(getUsageToken()).toBe('profile-token');
+        expect(getSecurityCallLog()).toEqual([
+            `find-generic-password -s ${configDirService} -w`
+        ]);
+    });
+
+    it('skips other profiles\' keychain items and uses the profile\'s credentials file when its entry is missing', () => {
+        const configDirService = makeConfigDirService('/fake/claude');
+
+        process.env.CLAUDE_CONFIG_DIR = '/fake/claude';
+        vi.spyOn(process, 'platform', 'get').mockReturnValue('darwin');
+        mockCredentialsFile(makeTokenPayload('file-token'));
+        mockedExecFileSync.mockImplementation((command: string, args?: string[]) => {
+            if (command === 'security' && args?.[0] === 'find-generic-password' && args[2] === configDirService) {
+                throw new Error('missing profile credential');
+            }
+
+            throw new Error(`Unexpected security args: ${args?.join(' ')}`);
+        });
+
+        expect(getUsageToken()).toBe('file-token');
+        expect(getSecurityCallLog()).toEqual([
+            `find-generic-password -s ${configDirService} -w`
+        ]);
+    });
+});
+
+describe('getMacKeychainConfigDirService', () => {
+    it('returns null for the default profile', () => {
+        expect(getMacKeychainConfigDirService()).toBeNull();
+    });
+
+    it('suffixes the service with the first 8 hex chars of sha256(config dir) when CLAUDE_CONFIG_DIR is set', () => {
+        process.env.CLAUDE_CONFIG_DIR = '/fake/claude';
+
+        expect(getMacKeychainConfigDirService()).toBe(makeConfigDirService('/fake/claude'));
+    });
+
+    it('hashes the raw environment value without resolving it, matching Claude Code', () => {
+        process.env.CLAUDE_CONFIG_DIR = '/fake/claude-work/';
+
+        expect(getMacKeychainConfigDirService()).toBe(makeConfigDirService('/fake/claude-work/'));
+    });
+
+    it('NFC-normalizes the directory before hashing, matching Claude Code', () => {
+        process.env.CLAUDE_CONFIG_DIR = '/fake/cafe\u0301';
+
+        expect(getMacKeychainConfigDirService()).toBe(makeConfigDirService('/fake/caf\u00e9'));
+    });
+
+    it('lets CLAUDE_SECURESTORAGE_CONFIG_DIR override the hash input, and an empty override forces the plain service', () => {
+        process.env.CLAUDE_CONFIG_DIR = '/fake/claude';
+
+        process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR = '/fake/secure';
+        expect(getMacKeychainConfigDirService()).toBe(makeConfigDirService('/fake/secure'));
+
+        process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR = '';
+        expect(getMacKeychainConfigDirService()).toBeNull();
+    });
 });
diff --git a/src/utils/usage-fetch.ts b/src/utils/usage-fetch.ts
index e2f48285..db468e65 100644
--- a/src/utils/usage-fetch.ts
+++ b/src/utils/usage-fetch.ts
@@ -515,11 +515,41 @@ function readUsageTokenFromCredentialsFile(): string | null {
     }
 }
 
+// Claude Code stores each non-default profile's credential under its own
+// keychain service: the plain name plus `-<sha256(configDir)[:8]>`, added
+// whenever CLAUDE_CONFIG_DIR is set. CLAUDE_SECURESTORAGE_CONFIG_DIR, when
+// present, replaces the hash input (an empty value forces the plain name).
+// The hash input is the raw environment value, NFC-normalized but not
+// resolved — the goal is to reproduce the exact string Claude Code's own
+// service-name builder hashes, not to locate a directory (#521). Returns
+// null for the default profile.
+export function getMacKeychainConfigDirService(): string | null {
+    const rawConfigDir = process.env.CLAUDE_SECURESTORAGE_CONFIG_DIR ?? process.env.CLAUDE_CONFIG_DIR ?? '';
+    if (rawConfigDir === '') {
+        return null;
+    }
+
+    const configDir = rawConfigDir.normalize('NFC');
+    const suffix = createHash('sha256').update(configDir).digest('hex').slice(0, 8);
+    return `${MACOS_USAGE_CREDENTIALS_SERVICE}-${suffix}`;
+}
+
 export function getUsageToken(): string | null {
     if (process.platform !== 'darwin') {
         return readUsageTokenFromCredentialsFile();
     }
 
+    const configDirService = getMacKeychainConfigDirService();
+    if (configDirService !== null) {
+        // A non-default profile owns exactly one keychain service name. On a
+        // miss, the plain service and the other suffixed items all belong to
+        // other profiles (or MCP servers), so fall through only to the
+        // profile's own .credentials.json rather than surface another
+        // account's usage.
+        return readUsageTokenFromMacKeychainService(configDirService)
+            ?? readUsageTokenFromCredentialsFile();
+    }
+
     return readUsageTokenFromMacKeychainService(MACOS_USAGE_CREDENTIALS_SERVICE)
         ?? readUsageTokenFromMacKeychainCandidates()
         ?? readUsageTokenFromCredentialsFile();