diff --git a/config/config.env b/config/config.env
new file mode 100644
index 0000000..6bceba0
--- /dev/null
+++ b/config/config.env
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+# asandbox defaults (bash-compatible env file)
+# Uncomment and edit as needed.
+
+# ASANDBOX_IMAGE=asandbox:latest
+# ASANDBOX_NETWORK=bridge
+# ASANDBOX_MEMORY=4g
+# ASANDBOX_CPUS=4
+# ASANDBOX_MOUNT_SSH=0
+# ASANDBOX_MOUNT_GITCONFIG=1
+# ASANDBOX_QUIET=0
+
+# Extra env keys always forwarded when set on the host:
+# ASANDBOX_PASS_ENV="ANTHROPIC_API_KEY OPENAI_API_KEY GEMINI_API_KEY GOOGLE_API_KEY XAI_API_KEY"