diff --git a/ra_aid/output/interface/base.py b/ra_aid/output/interface/base.py
new file mode 100644
index 0000000..114e3e6
--- /dev/null
+++ b/ra_aid/output/interface/base.py
@@ -0,0 +1,8 @@
+from typing import Protocol
+from .models import MarkdownPanel, StageHeader, TaskHeader, StatusMessage
+
+class OutputRenderer(Protocol):
+    def render_panel(self, panel: MarkdownPanel) -> None: ...
+    def render_stage(self, header: StageHeader) -> None: ...
+    def render_task(self, header: TaskHeader) -> None: ...
+    def render_status(self, message: StatusMessage) -> None: ...
diff --git a/ra_aid/output/interface/models.py b/ra_aid/output/interface/models.py
new file mode 100644
index 0000000..644a01a
--- /dev/null
+++ b/ra_aid/output/interface/models.py
@@ -0,0 +1,24 @@
+from dataclasses import dataclass
+from typing import Optional
+
+@dataclass
+class MarkdownPanel:
+    content: str
+    title: Optional[str] = None
+    icon: Optional[str] = None
+    border_style: Optional[str] = None
+
+@dataclass
+class StageHeader:
+    text: str
+    icon: Optional[str] = None
+
+@dataclass
+class TaskHeader:
+    text: str
+    icon: Optional[str] = None
+
+@dataclass
+class StatusMessage:
+    text: str
+    style: Optional[str] = None