Seed a versioned system prompt the demo agent uses

infra/seed.py

@@ -428,14 +428,38 @@ def seed_demo_agent(project, user, log=logger.info) -> dict[str, str]:
         tool.external_id = tool_external_id
         tool.save(update_fields=["external_id", "updated_at"])
 
+    # Seed a predefined system prompt (v1) at /prompts/ using the demo agent's
+    # instructions as its v1 content, then point the agent at that same text.
+    # Because the agent's text matches the version exactly, the agent editor's
+    # picker auto-preselects it. Idempotent: reuses an existing same-named prompt.
+    from prompts.models import SystemPrompt
+    from prompts.services import create_prompt
+
     meta = DEMO_AGENT
+    # Seed a predefined system prompt (v1) at /prompts/ using the demo agent's
+    # instructions as its v1 content, then point the agent at that same text.
+    # Because the agent's text matches the version exactly, the agent editor's
+    # picker auto-preselects it. Idempotent: reuses an existing same-named prompt.
+    prompt_name = "Acme Retail Support Refund Assistant"
+    prompt = SystemPrompt.objects.filter(project=project, name=prompt_name).first()
+    if prompt is None or not prompt.latest:
+        prompt = create_prompt(
+            project=project,
+            name=prompt_name,
+            description="Instructions for the demo Support Refund Assistant agent.",
+            content=meta["system_prompt"],
+            note="Seeded",
+            user=user,
+        )
+        log(f"Seeded system prompt '{prompt.name}' (v1).")
+
     agent, created = Agent.objects.get_or_create(
         project=project,
         name=meta["name"],
         defaults={
             "description": meta["description"],
             "base_model": base_model,
-            "system_prompt": meta["system_prompt"],
+            "system_prompt": prompt.latest.content,
             "retrieval_settings": {
                 "search_mode": "hybrid",
                 "top_k": 5,

infra/tests/test_seed_demo_agent.py

@@ -69,6 +69,25 @@ def test_is_idempotent(self):
         self.assertEqual(Tool.objects.filter(project=self.project).count(), 1)
         self.assertEqual(Agent.objects.get(project=self.project).retrieval_settings["top_k"], 5)
 
+    def test_seeds_a_versioned_prompt_the_agent_uses(self):
+        from prompts.models import SystemPrompt
+
+        seed_demo_agent(self.project, self.user)
+
+        # A predefined prompt (v1) exists at /prompts/.
+        prompt = SystemPrompt.objects.get(
+            project=self.project, name="Acme Retail Support Refund Assistant"
+        )
+        self.assertEqual(prompt.latest.version, 1)
+        # The agent's instructions match that version exactly, so the picker
+        # auto-preselects it and deletion of the prompt is blocked while in use.
+        agent = Agent.objects.get(project=self.project, name=DEMO_AGENT["name"])
+        self.assertEqual(agent.system_prompt, prompt.latest.content)
+        # Idempotent: re-running does not create a second prompt or bump v2.
+        seed_demo_agent(self.project, self.user)
+        self.assertEqual(SystemPrompt.objects.filter(project=self.project).count(), 1)
+        self.assertEqual(prompt.versions.count(), 1)
+
     def test_skips_when_no_model_exists(self):
         self.model.delete()
         status = seed_demo_agent(self.project, self.user)

templates/agents/agent_detail.html

@@ -471,15 +471,20 @@ <h2 class="text-base font-semibold text-gray-100">Expose <span id="expose-model-
     if (!fieldset || !ta) return;
     const allRadios = () => [...fieldset.querySelectorAll('input[name="system_prompt_version"]')];
     function syncAll() {
-      const checked = allRadios().find(r => r.checked);
       fieldset.querySelectorAll('[data-prompt-row]').forEach(row => {
         const rs = [...row.querySelectorAll('input[name="system_prompt_version"]')];
         const rowChecked = rs.find(r => r.checked);
+        const nameRadio = row.querySelector('[data-row-radio]');
         const summary = row.querySelector('[data-prompt-summary]');
+        if (!rs.length) return;
+        // The name radio means "latest": keep it checked whenever the row's pick
+        // is the latest version, regardless of which element the browser marked.
+        if (nameRadio) nameRadio.checked = !!rowChecked && rowChecked.hasAttribute('data-latest');
         if (!summary) return;
         if (rowChecked) summary.textContent = `v${rowChecked.dataset.version}` + (rowChecked.hasAttribute('data-latest') ? ' · latest' : ' · older version');
         else { const latest = rs.find(r => 'latest' in r.dataset); summary.textContent = latest ? `v${latest.dataset.version} · latest` : ''; }
       });
+      const checked = allRadios().find(r => r.checked);
       if (checked && ta.value !== checked.dataset.content) ta.value = checked.dataset.content || '';
     }
     allRadios().forEach(r => r.addEventListener('change', syncAll));

templates/partials/run_settings_js.html

@@ -16,18 +16,23 @@
   const allRadios = () => [...fieldset.querySelectorAll('input[name="system_prompt_version"]')];
 
   function syncAll() {
-    const checked = allRadios().find(r => r.checked);
     fieldset.querySelectorAll('[data-prompt-row]').forEach(row => {
       const rs = [...row.querySelectorAll('input[name="system_prompt_version"]')];
       const rowChecked = rs.find(r => r.checked);
+      const nameRadio = row.querySelector('[data-row-radio]');
       const summary = row.querySelector('[data-prompt-summary]');
+      if (!rs.length) return;
+      // The name radio means "latest". It stays checked whenever the row's pick
+      // is the latest version, regardless of which element the browser marked.
+      if (nameRadio) nameRadio.checked = !!rowChecked && rowChecked.hasAttribute('data-latest');
       if (!summary) return;
       if (rowChecked) summary.textContent = `v${rowChecked.dataset.version}` + (rowChecked.hasAttribute('data-latest') ? ' · latest' : ' · older version');
       else {
         const latest = rs.find(r => 'latest' in r.dataset);
         summary.textContent = latest ? `v${latest.dataset.version} · latest` : '';
       }
     });
+    const checked = allRadios().find(r => r.checked);
     if (checked && ta.value !== checked.dataset.content) ta.value = checked.dataset.content || '';
   }