diff --git a/packages/adapters/codex-local/src/server/codex-home.test.ts b/packages/adapters/codex-local/src/server/codex-home.test.ts
index aa51c4d7a53..f2fec642408 100644
--- a/packages/adapters/codex-local/src/server/codex-home.test.ts
+++ b/packages/adapters/codex-local/src/server/codex-home.test.ts
@@ -468,6 +468,17 @@ describe("reconcileManagedCodexHome", () => {
       expect(result.status).toBe("seeded");
       const written = JSON.parse(await fs.readFile(fx.agentAuth, "utf8"));
       expect(written).toEqual({ OPENAI_API_KEY: "sk-reconcile-1" });
+
+      const second = await reconcileManagedCodexHome({
+        companyId: "company-1",
+        configuredCodexHome: fx.agentHome,
+        apiKey: "sk-reconcile-1",
+        env: fx.env,
+      });
+      expect(second.status).toBe("already_seeded");
+      expect(JSON.parse(await fs.readFile(fx.agentAuth, "utf8"))).toEqual({
+        OPENAI_API_KEY: "sk-reconcile-1",
+      });
     } finally {
       await fs.rm(fx.root, { recursive: true, force: true });
     }
diff --git a/packages/adapters/codex-local/src/server/codex-home.ts b/packages/adapters/codex-local/src/server/codex-home.ts
index 66fd67272e5..b3f1b4eceef 100644
--- a/packages/adapters/codex-local/src/server/codex-home.ts
+++ b/packages/adapters/codex-local/src/server/codex-home.ts
@@ -31,6 +31,14 @@ function hasUsableAuthPayload(authPayload: unknown): boolean {
   return false;
 }
 
+function readApiKeyFromAuthPayload(authPayload: unknown): string | null {
+  if (authPayload === null || typeof authPayload !== "object" || Array.isArray(authPayload)) {
+    return null;
+  }
+  const raw = (authPayload as Record<string, unknown>).OPENAI_API_KEY;
+  return typeof raw === "string" && raw.trim().length > 0 ? raw.trim() : null;
+}
+
 export function resolveSharedCodexHomeDir(
   env: NodeJS.ProcessEnv = process.env,
 ): string {
@@ -96,6 +104,19 @@ export async function codexHomeHasUsableAuth(home: string): Promise<boolean> {
   }
 }
 
+async function codexHomeHasMatchingApiKeyAuth(home: string, apiKey: string): Promise<boolean> {
+  const authPath = path.join(home, "auth.json");
+  const existing = await fs.lstat(authPath).catch(() => null);
+  if (!existing || existing.isSymbolicLink()) return false;
+  try {
+    const raw = await fs.readFile(authPath, "utf8");
+    const parsed = JSON.parse(raw);
+    return readApiKeyFromAuthPayload(parsed) === apiKey.trim();
+  } catch {
+    return false;
+  }
+}
+
 async function ensureParentDir(target: string): Promise<void> {
   await fs.mkdir(path.dirname(target), { recursive: true });
 }
@@ -307,11 +328,15 @@ export async function reconcileManagedCodexHome(
     return { status: "already_seeded", home: resolved };
   }
 
+  if (apiKey && await codexHomeHasMatchingApiKeyAuth(resolved, apiKey)) {
+    return { status: "already_seeded", home: resolved };
+  }
+
   await seedManagedCodexHome(resolved, env, input.onLog ?? noopOnLog, { apiKey });
 
-  // Seeding always (re)writes when an API key is supplied; otherwise it only
-  // changes disk state when auth was missing. Report accordingly so callers can
-  // distinguish a real backfill from a verified no-op.
+  // Without an API key, seeding only changes disk state when auth was missing.
+  // With an API key, the matching-file short-circuit above filters out the
+  // already-seeded case before this write path.
   const status: ReconcileManagedCodexHomeStatus =
     !apiKey && hadUsableAuth ? "already_seeded" : "seeded";
   return { status, home: resolved };
diff --git a/packages/adapters/codex-local/src/server/execute.ts b/packages/adapters/codex-local/src/server/execute.ts
index c95f6638b11..e3c38d4963a 100644
--- a/packages/adapters/codex-local/src/server/execute.ts
+++ b/packages/adapters/codex-local/src/server/execute.ts
@@ -381,7 +381,7 @@ export async function execute(ctx: AdapterExecutionContext): Promise<AdapterExec
   ) {
     throw new Error(
       `no Codex credentials provisioned for managed home "${effectiveCodexHome}" ` +
-        `(no usable ${path.basename(effectiveCodexHome)}/auth.json and OPENAI_API_KEY is empty). ` +
+        `(no usable auth.json and OPENAI_API_KEY is empty). ` +
         `Sign in to Codex on the host with a ChatGPT subscription, or configure a per-agent ` +
         `OPENAI_API_KEY.`,
     );
diff --git a/server/src/__tests__/codex-auth-reconciliation.test.ts b/server/src/__tests__/codex-auth-reconciliation.test.ts
index 16f75c8fdce..0a157cd214c 100644
--- a/server/src/__tests__/codex-auth-reconciliation.test.ts
+++ b/server/src/__tests__/codex-auth-reconciliation.test.ts
@@ -179,5 +179,11 @@ describe("reconcileCodexLocalManagedHomesOnStartup", () => {
     expect(summary).toMatchObject({ scanned: 1, seeded: 1, failed: 0 });
     const written = JSON.parse(await fs.readFile(path.join(agentHome, "auth.json"), "utf8"));
     expect(written).toEqual({ OPENAI_API_KEY: "sk-plain-1" });
+
+    const second = await reconcileCodexLocalManagedHomesOnStartup(makeDb(rows));
+    expect(second).toMatchObject({ scanned: 1, seeded: 0, alreadySeeded: 1, failed: 0 });
+    expect(JSON.parse(await fs.readFile(path.join(agentHome, "auth.json"), "utf8"))).toEqual({
+      OPENAI_API_KEY: "sk-plain-1",
+    });
   });
 });
diff --git a/server/src/__tests__/codex-local-execute.test.ts b/server/src/__tests__/codex-local-execute.test.ts
index 0f78f6773a1..c987c93b0b7 100644
--- a/server/src/__tests__/codex-local-execute.test.ts
+++ b/server/src/__tests__/codex-local-execute.test.ts
@@ -58,6 +58,12 @@ type LogEntry = {
   chunk: string;
 };
 
+async function seedSharedCodexAuth(homeRoot: string): Promise<void> {
+  const sharedCodexHome = path.join(homeRoot, ".codex");
+  await fs.mkdir(sharedCodexHome, { recursive: true });
+  await fs.writeFile(path.join(sharedCodexHome, "auth.json"), '{"token":"shared"}\n', "utf8");
+}
+
 function createLocalSandboxRunner() {
   let counter = 0;
   return {
@@ -201,6 +207,7 @@ describe("codex execute", () => {
 
     const previousHome = process.env.HOME;
     process.env.HOME = root;
+    await seedSharedCodexAuth(root);
 
     let commandNotes: string[] = [];
     try {
@@ -261,6 +268,7 @@ describe("codex execute", () => {
     const previousPath = process.env.PATH;
     process.env.HOME = root;
     process.env.PATH = `${binDir}${path.delimiter}${process.env.PATH ?? ""}`;
+    await seedSharedCodexAuth(root);
 
     let loggedCommand: string | null = null;
     let loggedEnv: Record<string, string> = {};
@@ -328,6 +336,7 @@ describe("codex execute", () => {
 
     process.env.HOME = root;
     process.env.PATH = `${binDir}${path.delimiter}${process.env.PATH ?? ""}`;
+    await seedSharedCodexAuth(root);
 
     try {
       const result = await execute({
@@ -395,6 +404,7 @@ describe("codex execute", () => {
 
     const previousHome = process.env.HOME;
     process.env.HOME = root;
+    await seedSharedCodexAuth(root);
 
     try {
       const result = await execute({
@@ -505,6 +515,7 @@ describe("codex execute", () => {
 
     const previousHome = process.env.HOME;
     process.env.HOME = root;
+    await seedSharedCodexAuth(root);
 
     try {
       const result = await execute({
@@ -555,6 +566,7 @@ describe("codex execute", () => {
 
     const previousHome = process.env.HOME;
     process.env.HOME = root;
+    await seedSharedCodexAuth(root);
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 3, 22, 22, 29, 0));
 
@@ -615,6 +627,7 @@ describe("codex execute", () => {
 
     const previousHome = process.env.HOME;
     process.env.HOME = root;
+    await seedSharedCodexAuth(root);
 
     let commandNotes: string[] = [];
     try {
diff --git a/server/src/__tests__/server-startup-feedback-export.test.ts b/server/src/__tests__/server-startup-feedback-export.test.ts
index 410f550f55d..b8808eb7bfb 100644
--- a/server/src/__tests__/server-startup-feedback-export.test.ts
+++ b/server/src/__tests__/server-startup-feedback-export.test.ts
@@ -168,6 +168,15 @@ vi.mock("../services/index.js", () => ({
     })),
   })),
   reconcileCloudUpstreamRunsOnStartup: vi.fn(async () => ({ reconciled: 0 })),
+  reconcileCodexLocalManagedHomesOnStartup: vi.fn(async () => ({
+    scanned: 0,
+    seeded: 0,
+    alreadySeeded: 0,
+    externalOverride: 0,
+    noManagedHome: 0,
+    failed: 0,
+    seededAgentIds: [],
+  })),
   reconcilePersistedRuntimeServicesOnStartup: vi.fn(async () => ({ reconciled: 0 })),
   routineService: vi.fn(() => ({
     tickScheduledTriggers: vi.fn(async () => ({ triggered: 0 })),
diff --git a/server/src/index.ts b/server/src/index.ts
index 63ab47d07d5..8f3bcd3795c 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -733,7 +733,7 @@ export async function startServer(): Promise<StartedServer> {
   // Backfill auth.json into any already-isolated codex_local managed home that
   // was created by the #8272 isolation guard before the Phase 1 seeding fix.
   // Idempotent; the Phase 1 execute-time seeding covers new strandings.
-  void reconcileCodexLocalManagedHomesOnStartup(db as any)
+  void reconcileCodexLocalManagedHomesOnStartup(db)
     .then((result) => {
       if (result.seeded > 0 || result.failed > 0) {
         logger.warn(