diff --git a/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts b/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts
index fe9ec4c4fc81..2ee436f3dcbf 100644
--- a/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts
+++ b/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts
@@ -1,3 +1,5 @@
+import * as NodeOS from "node:os";
+
 import { historyResponseItems } from "../ContextHandoffBudget.ts";
 import type { ProviderAdapterV2HistoricalContext } from "../ProviderAdapter.ts";
 import {
@@ -38,6 +40,7 @@ import * as Predicate from "effect/Predicate";
 import * as FileSystem from "effect/FileSystem";
 import * as Fiber from "effect/Fiber";
 import * as Layer from "effect/Layer";
+import * as Path from "effect/Path";
 import * as PlatformError from "effect/PlatformError";
 import * as Ref from "effect/Ref";
 import * as Schema from "effect/Schema";
@@ -45,6 +48,7 @@ import * as Stream from "effect/Stream";
 import { TestClock } from "effect/testing";
 import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process";
 
+import { ServerConfig } from "../../config.ts";
 import * as McpProviderSession from "../../mcp/McpProviderSession.ts";
 import type { EventNdjsonLogger } from "../../provider/Layers/EventNdjsonLogger.ts";
 import {
@@ -77,6 +81,7 @@ import {
   CodexAppServerClientFactory,
   codexAppServerClientFactoryFromSettingsLayer,
   type CodexAppServerClientFactoryShape,
+  createCodexAdapterV2,
   makeCodexAdapterV2,
   makeCodexAppServerProtocolLogger,
   makeCodexAppServerSpawnCommand,
@@ -746,6 +751,49 @@ describe("CodexAdapterV2 process spawning", () => {
       ]);
     }).pipe(Effect.provideService(HostProcessPlatform, "linux")),
   );
+
+  it.effect("expands ~ in the configured binary path before spawning", () =>
+    Effect.gen(function* () {
+      const spawnedCommands: Array<string> = [];
+      const spawner = ChildProcessSpawner.make((command) => {
+        if (ChildProcess.isStandardCommand(command)) spawnedCommands.push(command.command);
+        return Effect.fail(
+          PlatformError.systemError({ _tag: "NotFound", module: "ChildProcess", method: "spawn" }),
+        );
+      });
+      const path = yield* Path.Path;
+      const adapter = yield* createCodexAdapterV2({
+        instanceId: CODEX_DEFAULT_INSTANCE_ID,
+        displayName: undefined,
+        environment: [],
+        enabled: true,
+        config: { ...DEFAULT_CODEX_SETTINGS, binaryPath: "~/bin/codex" },
+      }).pipe(
+        Effect.provide(
+          Layer.mergeAll(
+            codexAppServerClientFactoryFromSettingsLayer,
+            ServerConfig.layerTest(process.cwd(), { prefix: "t3-codex-binary-home-" }),
+          ),
+        ),
+        Effect.provideService(ChildProcessSpawner.ChildProcessSpawner, spawner),
+        Effect.provideService(ProviderEventLoggers, NoOpProviderEventLoggers),
+      );
+
+      yield* adapter
+        .openSession({
+          threadId: ThreadId.make("thread-binary-home"),
+          providerSessionId: ProviderSessionId.make("provider-session-binary-home"),
+          modelSelection: CODEX_TEST_MODEL_SELECTION,
+          runtimePolicy: CODEX_TEST_RUNTIME_POLICY,
+        })
+        .pipe(Effect.scoped, Effect.exit);
+
+      assert.deepEqual(spawnedCommands, [path.join(NodeOS.homedir(), "bin", "codex")]);
+    }).pipe(
+      Effect.provide(Layer.merge(idAllocatorLayer, NodeServices.layer)),
+      Effect.provideService(HostProcessPlatform, "linux"),
+    ),
+  );
 });
 
 describe("CodexAdapterV2 dynamic tool projection", () => {
diff --git a/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts b/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts
index 5af8a14fbf65..46cb637eb932 100644
--- a/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts
+++ b/apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts
@@ -79,6 +79,7 @@ import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process";
 import { resolveAttachmentPath } from "../../attachmentStore.ts";
 import { getCodexServiceTierOptionValue } from "../../codexModelOptions.ts";
 import { ServerConfig } from "../../config.ts";
+import { expandHomePath } from "../../pathExpansion.ts";
 import { buildCodexDeveloperInstructions } from "../../provider/CodexDeveloperInstructions.ts";
 import {
   describeMcpElicitation,
@@ -1411,6 +1412,7 @@ export const createCodexAdapterV2 = (
     const settings = {
       ...config,
       enabled,
+      binaryPath: expandHomePath(config.binaryPath),
       homePath: homeLayout.effectiveHomePath ?? "",
     } satisfies CodexSettings;