diff --git a/src/agents/cli-runner.spawn.test.ts b/src/agents/cli-runner.spawn.test.ts
index df2e4bea10e..04e7ccab1cd 100644
--- a/src/agents/cli-runner.spawn.test.ts
+++ b/src/agents/cli-runner.spawn.test.ts
@@ -92,6 +92,7 @@ function buildPreparedCliRunContext(params: {
   sessionEntry?: PreparedCliRunContext["params"]["sessionEntry"];
   agentId?: string;
   backend?: Partial<PreparedCliRunContext["preparedBackend"]["backend"]>;
+  preparedEnv?: PreparedCliRunContext["preparedBackend"]["env"];
   resolveExecutionArgs?: PreparedCliRunContext["backendResolved"]["resolveExecutionArgs"];
   config?: PreparedCliRunContext["params"]["config"];
   mcpConfigHash?: string;
@@ -162,7 +163,7 @@ function buildPreparedCliRunContext(params: {
     },
     preparedBackend: {
       backend,
-      env: {},
+      env: params.preparedEnv ?? {},
       ...(params.mcpConfigHash ? { mcpConfigHash: params.mcpConfigHash } : {}),
     },
     reusableCliSession: {},
@@ -532,6 +533,35 @@ describe("runCliAgent spawn path", () => {
     expect(requireArgAfter(input.argv, "--effort")).toBe("high");
   });
 
+  it("passes prepared backend env to the spawned CLI process", async () => {
+    mockSuccessfulCliRun();
+
+    await executePreparedCliRun(
+      buildPreparedCliRunContext({
+        provider: "codex-cli",
+        model: "gpt-5.5",
+        runId: "run-prepared-env",
+        backend: {
+          env: {
+            GEMINI_CLI_HOME: "/ignored/static-home",
+            STATIC_BACKEND_FLAG: "set",
+          },
+        },
+        preparedEnv: {
+          GEMINI_CLI_HOME: "/tmp/openclaw-gemini-profile-home",
+          GEMINI_CLI_SYSTEM_SETTINGS_PATH: "/tmp/openclaw-gemini-system-settings.json",
+        },
+      }),
+    );
+
+    const input = mockCallArg(supervisorSpawnMock) as { env?: Record<string, string> };
+    expect(input.env?.STATIC_BACKEND_FLAG).toBe("set");
+    expect(input.env?.GEMINI_CLI_HOME).toBe("/tmp/openclaw-gemini-profile-home");
+    expect(input.env?.GEMINI_CLI_SYSTEM_SETTINGS_PATH).toBe(
+      "/tmp/openclaw-gemini-system-settings.json",
+    );
+  });
+
   it("passes OpenClaw skills to Claude as a session plugin", async () => {
     const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-cli-skills-"));
     const skillDir = path.join(workspaceDir, "skills", "weather");
diff --git a/src/agents/cli-runner/execute.ts b/src/agents/cli-runner/execute.ts
index a9a68f01107..297d37a1378 100644
--- a/src/agents/cli-runner/execute.ts
+++ b/src/agents/cli-runner/execute.ts
@@ -676,12 +676,16 @@ export async function executePreparedCliRun(
             }
             delete next[key];
           }
-          if (backend.env && Object.keys(backend.env).length > 0) {
+          const backendEnv = {
+            ...(backend.env ?? {}),
+            ...(context.preparedBackend.env ?? {}),
+          };
+          if (Object.keys(backendEnv).length > 0) {
             Object.assign(
               next,
               sanitizeHostExecEnv({
                 baseEnv: {},
-                overrides: backend.env,
+                overrides: backendEnv,
                 blockPathOverrides: true,
               }),
             );