diff --git a/src/core/cli-identity.ts b/src/core/cli-identity.ts
index dfc14cce4a..4d58bc2e44 100644
--- a/src/core/cli-identity.ts
+++ b/src/core/cli-identity.ts
@@ -333,6 +333,15 @@ export function clearSessionIdentity(
 ): void {
   try { rmSync(sessionIdentityPath(sessionDataDir, sessionId, tool), { force: true }); }
   catch { /* best-effort: absence is the desired state */ }
+  // Before #1543 identities lived directly under cli-identity/. Upgraded
+  // sessions no longer read or overwrite those files, so remove the exact
+  // legacy path as well instead of leaving a live token behind indefinitely.
+  try {
+    rmSync(
+      join(sessionIdentityDir(sessionDataDir), `${assertSafeSegment(sessionId)}.${tool}.env`),
+      { force: true },
+    );
+  } catch { /* best-effort: absence is the desired state */ }
 }
 
 /** Drop every identity for a session (teardown). */
@@ -340,6 +349,12 @@ export function clearAllSessionIdentities(sessionDataDir: string, sessionId: str
   for (const tool of Object.keys(IDENTITY_ENV_KEYS) as TriggerUserAuthTool[]) {
     clearSessionIdentity(sessionDataDir, sessionId, tool);
   }
+  try {
+    rmSync(
+      join(sessionIdentityDir(sessionDataDir), `${assertSafeSegment(sessionId)}.turn`),
+      { force: true },
+    );
+  } catch { /* best-effort: absence is the desired state */ }
 }
 
 /**
diff --git a/test/cli-identity.test.ts b/test/cli-identity.test.ts
index 589251c955..ff03afaf9a 100644
--- a/test/cli-identity.test.ts
+++ b/test/cli-identity.test.ts
@@ -150,6 +150,23 @@ describe('clearSessionIdentity', () => {
     expect(existsSync(sessionIdentityPath(dir, SESSION, 'bytedcli'))).toBe(true);
   });
 
+  it('removes the matching pre-#1543 identity without disturbing other legacy files', () => {
+    const identityDir = join(dir, 'cli-identity');
+    mkdirSync(identityDir, { recursive: true });
+    const stale = join(identityDir, `${SESSION}.lark-cli.env`);
+    const otherTool = join(identityDir, `${SESSION}.bytedcli.env`);
+    const otherSession = join(identityDir, 'sess-other.lark-cli.env');
+    writeFileSync(stale, 'live-token');
+    writeFileSync(otherTool, 'other-tool-token');
+    writeFileSync(otherSession, 'other-session-token');
+
+    clearSessionIdentity(dir, SESSION, 'lark-cli');
+
+    expect(existsSync(stale)).toBe(false);
+    expect(existsSync(otherTool)).toBe(true);
+    expect(existsSync(otherSession)).toBe(true);
+  });
+
   it('clears every tool on teardown', () => {
     writeSessionIdentity(dir, SESSION, { tool: 'lark-cli', appId: 'a', userAccessToken: 'tok' });
     writeSessionIdentity(dir, SESSION, { tool: 'bytedcli', cloudJwt: 'jwt' });
@@ -157,6 +174,24 @@ describe('clearSessionIdentity', () => {
     expect(existsSync(sessionIdentityPath(dir, SESSION, 'lark-cli'))).toBe(false);
     expect(existsSync(sessionIdentityPath(dir, SESSION, 'bytedcli'))).toBe(false);
   });
+
+  it('clears every pre-#1543 identity and turn marker on teardown', () => {
+    const identityDir = join(dir, 'cli-identity');
+    mkdirSync(identityDir, { recursive: true });
+    const legacyPaths = [
+      join(identityDir, `${SESSION}.lark-cli.env`),
+      join(identityDir, `${SESSION}.bytedcli.env`),
+      join(identityDir, `${SESSION}.turn`),
+    ];
+    for (const path of legacyPaths) writeFileSync(path, 'stale');
+    const unrelated = join(identityDir, `${SESSION}.unknown.env`);
+    writeFileSync(unrelated, 'keep');
+
+    clearAllSessionIdentities(dir, SESSION);
+
+    for (const path of legacyPaths) expect(existsSync(path)).toBe(false);
+    expect(existsSync(unrelated)).toBe(true);
+  });
 });
 
 // The wrapper is what actually runs, on every CLI call. These tests execute it