diff --git a/bin/cli/commands/doctor.mjs b/bin/cli/commands/doctor.mjs
index 0a2b78db7475..087101b50da7 100644
--- a/bin/cli/commands/doctor.mjs
+++ b/bin/cli/commands/doctor.mjs
@@ -380,18 +380,61 @@ function resolveLivenessUrl(options = {}) {
   return `http://${formatHostForUrl(host || "127.0.0.1")}:${dashboardPort}/api/health/degradation`;
 }
 
+async function probeUrl(url) {
+  try {
+    const response = await fetchWithTimeout(url);
+    return { ok: response.ok, status: response.status };
+  } catch {
+    return { ok: false, status: 0 };
+  }
+}
+
 async function checkServerLiveness(options = {}) {
   const url = resolveLivenessUrl(options);
 
+  // First attempt: configured health endpoint (may require auth token).
+  const primary = await probeUrl(url);
+  if (primary.ok) {
+    return ok("Server liveness", "Server health endpoint is reachable", { url, status: primary.status });
+  }
+
+  // #6162: /api/health and /api/health/degradation require a management token.
+  // When unauthenticated, fall back to probing a publicly served static asset
+  // (favicon.ico) to confirm the Next.js server is alive and reachable.
+  // Derive the fallback URL from the primary URL (preserving protocol/host/port)
+  // so custom liveness URL configurations are honored. Fall back to defaults
+  // only if the primary URL can't be parsed.
+  let fallbackUrl;
   try {
-    const response = await fetchWithTimeout(url);
-    if (!response.ok) {
-      return warn("Server liveness", `Server responded with HTTP ${response.status}`, { url });
-    }
-    return ok("Server liveness", "Server health endpoint is reachable", { url });
+    const parsed = new URL(url);
+    parsed.pathname = "/favicon.ico";
+    parsed.search = "";
+    parsed.hash = "";
+    fallbackUrl = parsed.toString();
   } catch {
-    return warn("Server liveness", "Server health endpoint is not reachable", { url });
+    const port = parsePort(process.env.PORT || "20128", 20128);
+    const dashboardPort = parsePort(process.env.DASHBOARD_PORT || String(port), port);
+    const host = String(options.livenessHost || process.env.OMNIROUTE_DOCTOR_HOST || "127.0.0.1")
+      .trim()
+      .replace(/^https?:\/\//, "")
+      .replace(/\/.*$/, "");
+    fallbackUrl = `http://${formatHostForUrl(host || "127.0.0.1")}:${dashboardPort}/favicon.ico`;
   }
+  const fallback = await probeUrl(fallbackUrl);
+
+  if (fallback.ok) {
+    return ok(
+      "Server liveness",
+      `Server reachable (health endpoint returned ${primary.status}, likely requires MANAGEMENT_TOKEN)`,
+      { primaryUrl: url, primaryStatus: primary.status, fallbackUrl, fallbackStatus: fallback.status }
+    );
+  }
+
+  return warn(
+    "Server liveness",
+    `Server health endpoint returned HTTP ${primary.status || "no-response"} and fallback probe failed`,
+    { primaryUrl: url, primaryStatus: primary.status, fallbackUrl, fallbackStatus: fallback.status }
+  );
 }
 
 export async function collectDoctorChecks(context = {}, options = {}) {
diff --git a/src/lib/cli-helper/claudeProfileAutoSync.ts b/src/lib/cli-helper/claudeProfileAutoSync.ts
index 19a515695af7..431f0a1013a0 100644
--- a/src/lib/cli-helper/claudeProfileAutoSync.ts
+++ b/src/lib/cli-helper/claudeProfileAutoSync.ts
@@ -1,7 +1,7 @@
 import path from "node:path";
-import { ensureCliConfigWriteAllowed, getCliConfigPaths } from "@/shared/services/cliRuntime";
-import { getModelSyncInternalBaseUrl } from "@/shared/services/modelSyncScheduler";
-import { isFeatureFlagEnabled } from "@/shared/utils/featureFlags";
+import { ensureCliConfigWriteAllowed, getCliConfigPaths } from "../../shared/services/cliRuntime";
+import { getModelSyncInternalBaseUrl } from "../../shared/services/modelSyncScheduler";
+import { isFeatureFlagEnabled } from "../../shared/utils/featureFlags";
 
 type SyncResult =
   | {
diff --git a/src/lib/cli-helper/codexProfileAutoSync.ts b/src/lib/cli-helper/codexProfileAutoSync.ts
index c3040ed09dd3..023da5d89903 100644
--- a/src/lib/cli-helper/codexProfileAutoSync.ts
+++ b/src/lib/cli-helper/codexProfileAutoSync.ts
@@ -1,7 +1,7 @@
 import path from "node:path";
-import { ensureCliConfigWriteAllowed, getCliConfigPaths } from "@/shared/services/cliRuntime";
-import { getModelSyncInternalBaseUrl } from "@/shared/services/modelSyncScheduler";
-import { isFeatureFlagEnabled } from "@/shared/utils/featureFlags";
+import { ensureCliConfigWriteAllowed, getCliConfigPaths } from "../../shared/services/cliRuntime";
+import { getModelSyncInternalBaseUrl } from "../../shared/services/modelSyncScheduler";
+import { isFeatureFlagEnabled } from "../../shared/utils/featureFlags";
 
 type SyncResult =
   | {
diff --git a/src/lib/cli-helper/config-generator/opencode.ts b/src/lib/cli-helper/config-generator/opencode.ts
index 265246e6d5de..4081cc32a2a9 100644
--- a/src/lib/cli-helper/config-generator/opencode.ts
+++ b/src/lib/cli-helper/config-generator/opencode.ts
@@ -5,7 +5,7 @@ import {
   parseOutboundUrl,
   isCloudMetadataHost,
   OutboundUrlGuardError,
-} from "@/shared/network/outboundUrlGuard";
+} from "../../../shared/network/outboundUrlGuard";
 
 const CONFIG_PATH = path.join(os.homedir(), ".config", "opencode", "opencode.json");
 
diff --git a/src/lib/cli-helper/tool-detector.ts b/src/lib/cli-helper/tool-detector.ts
index 3dbfdb0ac703..b6463132ca82 100644
--- a/src/lib/cli-helper/tool-detector.ts
+++ b/src/lib/cli-helper/tool-detector.ts
@@ -3,7 +3,7 @@ import path from "node:path";
 import { execFile } from "node:child_process";
 import { promisify } from "node:util";
 import { getCurrentHermesAgentRoles } from "./config-generator/hermes-agent";
-import { getCachedLoginShellPath, mergeShellPath } from "@/shared/services/loginShellPath";
+import { getCachedLoginShellPath, mergeShellPath } from "../../shared/services/loginShellPath";
 
 const execFileAsync = promisify(execFile);
 let execFileImpl = execFileAsync;
diff --git a/tests/unit/cli-doctor-liveness-fallback-6162.test.ts b/tests/unit/cli-doctor-liveness-fallback-6162.test.ts
new file mode 100644
index 000000000000..a77ec143e8c8
--- /dev/null
+++ b/tests/unit/cli-doctor-liveness-fallback-6162.test.ts
@@ -0,0 +1,66 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync, existsSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+// Regression test for #6162 (liveness portion): `omniroute doctor` reported
+// "Server liveness: Server responded with HTTP 401" on healthy installs
+// because /api/health and /api/health/degradation both require the management
+// token. The doctor called them without auth → 401 → WARN, even when the
+// Next.js server was clearly alive and listening.
+//
+// Fix: probe the configured health endpoint first; on 401/403, fall back to
+// a publicly served static asset (/favicon.ico) to confirm the server is
+// alive. WARN now only fires when both probes fail.
+//
+// This regression test asserts:
+//   1. The current doctor.mjs source contains the fallback logic.
+//   2. The fallback derives its URL from the primary URL via `new URL()`
+//      so custom host/port/protocol are preserved (Gemini code-assist review).
+
+const ROOT = join(dirname(fileURLToPath(import.meta.url)), "..", "..");
+const DOCTOR_SRC = join(ROOT, "bin/cli/commands/doctor.mjs");
+
+test("doctor.mjs must exist", () => {
+  assert.ok(existsSync(DOCTOR_SRC), "bin/cli/commands/doctor.mjs should exist");
+});
+
+test("doctor.mjs implements a /favicon.ico fallback for unauthenticated liveness (#6162)", () => {
+  const content = readFileSync(DOCTOR_SRC, "utf8");
+
+  assert.ok(
+    content.includes("/favicon.ico"),
+    "doctor.mjs must include /favicon.ico as a fallback probe (fix for #6162)"
+  );
+
+  // The probe order matters: try the configured health endpoint first, then
+  // fall back. Locking the order prevents future refactors from regressing
+  // back to "always report WARN on 401".
+  assert.ok(
+    /\bprimary\.ok\b/.test(content),
+    "doctor.mjs must branch on `primary.ok` to decide whether to fall back to /favicon.ico"
+  );
+});
+
+test("doctor.mjs derives fallback URL from primary URL via new URL() (Gemini review)", () => {
+  const content = readFileSync(DOCTOR_SRC, "utf8");
+
+  assert.ok(
+    content.includes("new URL("),
+    "doctor.mjs must derive the fallback URL from the primary URL via `new URL()` to preserve protocol/host/port (Gemini review feedback on PR #6163)"
+  );
+});
+
+test("doctor.mjs no longer reports WARN on HTTP 401/403 alone", () => {
+  const content = readFileSync(DOCTOR_SRC, "utf8");
+
+  // Old (buggy) line was:
+  //   return warn("Server liveness", `Server responded with HTTP ${response.status}`, { url });
+  // This asserted immediately on !response.ok without considering auth.
+  // The fix should NOT contain that exact phrase anymore.
+  assert.ok(
+    !content.includes("`Server responded with HTTP ${response.status}`"),
+    "doctor.mjs must not contain the buggy 'Server responded with HTTP ${response.status}' warn message (would be hit on auth-required 401)"
+  );
+});
\ No newline at end of file
diff --git a/tests/unit/cli-helper-tool-detector-paths-6162.test.ts b/tests/unit/cli-helper-tool-detector-paths-6162.test.ts
new file mode 100644
index 000000000000..e8810d8db7a8
--- /dev/null
+++ b/tests/unit/cli-helper-tool-detector-paths-6162.test.ts
@@ -0,0 +1,61 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync, existsSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+// Regression test for #6162: published `omniroute doctor` failed with
+// "Could not run CLI tool checks: Cannot find package '@/shared'" because
+// src/lib/cli-helper/*.ts files imported `@/shared/...` aliases that the
+// CLI runtime (tsx + ESM `import()`) cannot resolve. Fix: replace
+// `@/shared/...` with relative imports in the cli-helper files so they work
+// in the published package without a compile step.
+//
+// Lock the fix by asserting that no cli-helper source file uses the
+// `@/shared` alias any more, and that the runtime module load succeeds.
+
+const ROOT = join(dirname(fileURLToPath(import.meta.url)), "..", "..");
+
+const CLI_HELPER_FILES = [
+  "src/lib/cli-helper/tool-detector.ts",
+  "src/lib/cli-helper/claudeProfileAutoSync.ts",
+  "src/lib/cli-helper/codexProfileAutoSync.ts",
+  "src/lib/cli-helper/config-generator/opencode.ts",
+];
+
+for (const file of CLI_HELPER_FILES) {
+  test(`${file} must not use @/shared path alias (fix for #6162)`, () => {
+    const abs = join(ROOT, file);
+    assert.ok(existsSync(abs), `${file} should exist`);
+    const content = readFileSync(abs, "utf8");
+    assert.ok(
+      !/@\/shared/.test(content),
+      `${file} must not import via "@/shared/..." alias — the published CLI runtime (tsx + ESM import) cannot resolve tsconfig path aliases. Use relative paths instead. See #6162.`
+    );
+  });
+}
+
+test("tool-detector.ts is importable at runtime (regression for #6162)", async () => {
+  // This would have failed before the fix with
+  // "Cannot find package '@/shared' imported from .../tool-detector.ts".
+  const mod = await import("../../src/lib/cli-helper/tool-detector.ts");
+  assert.equal(typeof mod.detectAllTools, "function");
+  assert.equal(typeof mod.detectTool, "function");
+});
+
+test("claudeProfileAutoSync.ts is importable at runtime (regression for #6162)", async () => {
+  const mod = await import("../../src/lib/cli-helper/claudeProfileAutoSync.ts");
+  // The module exports at least the sync function; we don't care about its
+  // specific name, only that the import resolves without throwing.
+  assert.equal(typeof mod, "object");
+});
+
+test("codexProfileAutoSync.ts is importable at runtime (regression for #6162)", async () => {
+  const mod = await import("../../src/lib/cli-helper/codexProfileAutoSync.ts");
+  assert.equal(typeof mod, "object");
+});
+
+test("config-generator/opencode.ts is importable at runtime (regression for #6162)", async () => {
+  const mod = await import("../../src/lib/cli-helper/config-generator/opencode.ts");
+  assert.equal(typeof mod, "object");
+});
\ No newline at end of file