feat(v2 managed agents): add adapters package init

litellm/managed_agents/adapters/__init__.py

@@ -0,0 +1,44 @@
+"""Sandbox adapters for managed agents v2.
+
+Each adapter translates the sandbox-agnostic public API
+(`/v2/sessions/:id/messages`, `/v2/sessions/:id/events`, etc.) into the
+provider-specific HTTP calls described in contract §7. Today only
+`opencode` ships — additional providers register here without touching
+the public API surface.
+
+Public exports:
+  - `SandboxAdapter` — Protocol all adapters implement.
+  - `SandboxUnreachableError` — raised on connect/timeout failures
+    (handler maps to 504).
+  - `SandboxBadGatewayError` — raised on malformed sandbox responses
+    (handler maps to 502).
+  - `OpencodeAdapter` — the shipped adapter for `sandbox.type="opencode"`.
+  - `get_adapter` — registry lookup; raises `ValueError` for unknown
+    sandbox types.
+  - `normalize_opencode_message` / `normalize_opencode_event` — pure
+    helpers, exported for unit tests.
+"""
+
+from litellm.managed_agents.adapters.base import (
+    SandboxAdapter,
+    SandboxBadGatewayError,
+    SandboxUnreachableError,
+)
+from litellm.managed_agents.adapters.normalization import (
+    event_matches_session,
+    normalize_opencode_event,
+    normalize_opencode_message,
+)
+from litellm.managed_agents.adapters.opencode import OpencodeAdapter
+from litellm.managed_agents.adapters.registry import get_adapter
+
+__all__ = [
+    "SandboxAdapter",
+    "SandboxUnreachableError",
+    "SandboxBadGatewayError",
+    "OpencodeAdapter",
+    "get_adapter",
+    "normalize_opencode_message",
+    "normalize_opencode_event",
+    "event_matches_session",
+]