diff --git a/examples/multi-agent-chat/.env.example b/examples/multi-agent-chat/.env.example
new file mode 100644
index 000000000..ed6ed73ba
--- /dev/null
+++ b/examples/multi-agent-chat/.env.example
@@ -0,0 +1 @@
+OPENAI_API_KEY=sk-...
diff --git a/examples/supabase-chat/.env.local.example b/examples/supabase-chat/.env.local.example
new file mode 100644
index 000000000..9fe1d19c7
--- /dev/null
+++ b/examples/supabase-chat/.env.local.example
@@ -0,0 +1,5 @@
+NEXT_PUBLIC_SUPABASE_URL=https://your-project-id.supabase.co
+NEXT_PUBLIC_SUPABASE_ANON_KEY=your-anon-key
+OPENROUTER_API_KEY=sk-or-v1-...
+# Optional: defaults to openai/gpt-5.5
+# OPENROUTER_MODEL=openai/gpt-5.5
diff --git a/examples/vercel-ai-chat/.env.example b/examples/vercel-ai-chat/.env.example
new file mode 100644
index 000000000..ed6ed73ba
--- /dev/null
+++ b/examples/vercel-ai-chat/.env.example
@@ -0,0 +1 @@
+OPENAI_API_KEY=sk-...