Modal backend stubs

atropos/backends/__init__.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from typing import Any
+
+from .base import ToolBackend
+from .modal_backend import ModalBackendConfig, ModalToolBackend
+from .nomad_backend import NomadBackendConfig, NomadToolBackend
+
+
+def create_tool_backend(cfg: Any) -> ToolBackend:
+    mode = str(getattr(cfg, "tool_pool_mode", "nomad")).strip().lower()
+    if mode == "nomad":
+        return NomadToolBackend(NomadBackendConfig.from_agent_env_config(cfg))
+    if mode == "modal":
+        return ModalToolBackend(ModalBackendConfig.from_agent_env_config(cfg))
+    raise ValueError(f"Unknown tool_pool_mode: {mode}")
+
+
+__all__ = [
+    "ToolBackend",
+    "create_tool_backend",
+    "NomadBackendConfig",
+    "NomadToolBackend",
+    "ModalBackendConfig",
+    "ModalToolBackend",
+]
+