diff --git a/static/i18n.js b/static/i18n.js
index ec0df00f..3c9af6f1 100644
--- a/static/i18n.js
+++ b/static/i18n.js
@@ -1318,6 +1318,7 @@ const LOCALES = {
     cron_job_updated: 'Job updated',
     cron_model_label: 'Model Override',
     cron_model_hint: 'Override the default model for this job.',
+    cron_model_no_agent_hint: 'No-agent jobs run the configured script directly; model is unused.',
     cron_model_use_default: 'Default (use profile/system default)',
     cron_delete_confirm_title: 'Delete cron job',
     cron_delete_confirm_message: 'This cannot be undone.',
@@ -7104,6 +7105,7 @@ const LOCALES = {
     cron_job_updated: 'Job updated',
     cron_model_label: 'Model Override',
     cron_model_hint: 'Override the default model for this job.',
+    cron_model_no_agent_hint: 'No-agent jobs run the configured script directly; model is unused.',
     cron_model_use_default: 'Default (use profile/system default)',
     cron_delete_confirm_title: 'Delete cron job',
     cron_delete_confirm_message: 'This cannot be undone.',
@@ -14630,6 +14632,7 @@ const LOCALES = {
     cron_job_updated: 'Job updated',
     cron_model_label: 'Model Override',
     cron_model_hint: 'Override the default model for this job.',
+    cron_model_no_agent_hint: 'No-agent jobs run the configured script directly; model is unused.',
     cron_model_use_default: 'Default (use profile/system default)',
     cron_delete_confirm_title: 'Delete cron job',
     cron_delete_confirm_message: 'This cannot be undone.',
diff --git a/tests/test_cron_model_provider_picker.py b/tests/test_cron_model_provider_picker.py
index 91f6ae75..1edbcd93 100644
--- a/tests/test_cron_model_provider_picker.py
+++ b/tests/test_cron_model_provider_picker.py
@@ -193,3 +193,9 @@ def test_cron_model_picker_i18n_keys_exist():
     assert "cron_model_label" in I18N_JS
     assert "cron_model_use_default" in I18N_JS
     assert "cron_model_hint" in I18N_JS
+    # #4031: the no-agent hint key must be DEFINED in the locale table (with its
+    # value), not merely referenced in panels.js — t() returns the key name itself
+    # for a missing translation, so a missing key would render the literal
+    # "cron_model_no_agent_hint" to the user instead of the hint text.
+    assert "cron_model_no_agent_hint:" in I18N_JS
+    assert "No-agent jobs run the configured script directly" in I18N_JS