implement session management in agent harness

agent-sessions/tools/memory.py

@@ -0,0 +1,60 @@
+from memory import MemoryStore
+
+
+store: MemoryStore | None = None
+session_id: str | None = None
+
+
+def configure_memory(memory_store: MemoryStore, active_session_id: str) -> None:
+    global store, session_id
+    store = memory_store
+    session_id = active_session_id
+
+
+def read_memory(scope: str) -> str:
+    return _get_store().read_notes(scope)
+
+
+def append_memory(scope: str, content: str) -> str:
+    return _get_store().append_notes(scope, content)
+
+
+def list_sessions() -> str:
+    sessions = _get_store().list_sessions()
+    if not sessions:
+        return "No saved sessions."
+    return "\n".join(
+        f"{item['id']} | {item['updated_at']} | {item['summary'][:160] or '(no summary)'}"
+        for item in sessions
+    )
+
+
+def search_sessions(query: str) -> str:
+    sessions = _get_store().search_sessions(query)
+    if not sessions:
+        return "No matching sessions."
+    return "\n".join(
+        f"{item['id']} | {item['updated_at']} | {item['summary'][:500] or '(no summary)'}"
+        for item in sessions
+    )
+
+
+def read_session(session_id: str) -> str:
+    session = _get_store().load_session(session_id)
+    transcript = "\n".join(
+        f"{message.get('role', 'unknown')}: {message.get('content') or '[tool call]'}"
+        for message in session.get("transcript", session.get("messages", []))
+    )
+    return f"Summary:\n{session.get('summary') or '(no summary)'}\n\nTranscript:\n{transcript[:12000]}"
+
+
+def write_session_summary(summary: str) -> str:
+    if session_id is None:
+        raise RuntimeError("Memory has not been configured.")
+    return _get_store().write_summary(session_id, summary)
+
+
+def _get_store() -> MemoryStore:
+    if store is None:
+        raise RuntimeError("Memory has not been configured.")
+    return store