feat: more functionality for obsidian plugin

src/beaver_gateway/frontends/markdown/frontend.py

@@ -134,6 +134,11 @@ class MarkdownFrontend(Frontend):
         async def healthz() -> dict[str, str]:
             return {"status": "ok"}
 
+        @app.get("/agents")
+        async def list_agents(request: Request) -> dict[str, Any]:
+            await require_token(request, runtime, scope="messages")
+            return {"agents": [{"name": a.name} for a in runtime.agents]}
+
         @app.post("/chat")
         async def chat(request: Request) -> Any:
             token_name = await require_token(request, runtime, scope="messages")
@@ -218,10 +223,18 @@ class MarkdownFrontend(Frontend):
             # When the parser produced no messages (file empty / only
             # frontmatter), there's nothing to dispatch.
         if not parsed.messages:
-            return {"status": "nothing_to_do", "reason": "empty file"}
+            return {
+                "status": "nothing_to_do",
+                "reason": "empty file",
+                "new_content": file_text,
+            }
 
         if parser.last_role(parsed.messages) == "assistant":
-            return {"status": "nothing_to_do", "reason": "last turn is assistant"}
+            return {
+                "status": "nothing_to_do",
+                "reason": "last turn is assistant",
+                "new_content": file_text,
+            }
 
         agent = runtime.agents.get(agent_name)
         if agent is None:
@@ -281,9 +294,8 @@ class MarkdownFrontend(Frontend):
         updated_metadata = dict(parsed.metadata)
         updated_metadata["agent"] = agent.name
         updated_metadata["fingerprint"] = fingerprint_messages(updated_messages)
-        await _write_atomic(
-            file_path, _reattach_frontmatter(updated_metadata, new_body)
-        )
+        new_content = _reattach_frontmatter(updated_metadata, new_body)
+        await _write_atomic(file_path, new_content)
 
         # Broadcast our own turn so other handlers (none today, but the
         # symmetry is worth keeping) see what happened. ``source`` marks
@@ -301,7 +313,12 @@ class MarkdownFrontend(Frontend):
             except Exception:  # noqa: BLE001
                 _log.exception("turn_log_handler raised; continuing")
 
-        return {"status": "ok", "turns_appended": 1, "agent": agent.name}
+        return {
+            "status": "ok",
+            "turns_appended": 1,
+            "agent": agent.name,
+            "new_content": new_content,
+        }
 
     # ---- helpers -------------------------------------------------------