diff --git a/src/runner/k8s-job.ts b/src/runner/k8s-job.ts
index 67996e0..f3cad5e 100644
--- a/src/runner/k8s-job.ts
+++ b/src/runner/k8s-job.ts
@@ -158,7 +158,6 @@ function runnerEnv(options: RunnerJobRenderOptions, context: { namespace: string
     { name: "AGENTRUN_K8S_JOB_NAME", value: context.jobName },
     { name: "AGENTRUN_LOG_PATH", value: "/tmp/agentrun-runner.jsonl" },
     { name: "AGENTRUN_RUNNER_IDLE_TIMEOUT_MS", value: "600000" },
-    { name: "AGENTRUN_RUNNER_ONE_SHOT", value: "true" },
     { name: "HOME", value: "/home/agentrun" },
     { name: "CODEX_HOME", value: codexHome },
     ...(selectedSecret ? [{ name: "AGENTRUN_CODEX_SECRET_HOME", value: selectedSecret.projectionMountPath }] : []),
diff --git a/src/selftest/cases/20-runner-k8s-job.ts b/src/selftest/cases/20-runner-k8s-job.ts
index e63eab0..937e043 100644
--- a/src/selftest/cases/20-runner-k8s-job.ts
+++ b/src/selftest/cases/20-runner-k8s-job.ts
@@ -126,7 +126,8 @@ function assertRunnerJobUsesWritableCodexHome(manifest: JsonRecord, expectedCode
   assert.equal(value("HOME"), "/home/agentrun");
   assert.equal(value("CODEX_HOME"), expectedCodexHome);
   assert.equal(value("AGENTRUN_CODEX_SECRET_HOME"), projectionPath);
-  assert.equal(value("AGENTRUN_RUNNER_ONE_SHOT"), "true");
+  assert.equal(value("AGENTRUN_RUNNER_IDLE_TIMEOUT_MS"), "600000");
+  assert.equal(value("AGENTRUN_RUNNER_ONE_SHOT"), undefined);
   assert.notEqual(value("CODEX_HOME"), value("AGENTRUN_CODEX_SECRET_HOME"));
 }