diff --git a/harness/tests/test_session_mutations.py b/harness/tests/test_session_mutations.py
new file mode 100644
index 00000000..4d34e7d7
--- /dev/null
+++ b/harness/tests/test_session_mutations.py
@@ -0,0 +1,69 @@
+"""Tests for session manifest mutations (rename, group, archive, delete)."""
+import pytest
+
+from tht.config import DatabaseConfig
+from tht.session.store import (
+    SessionError,
+    create_session,
+    delete_session,
+    load_session,
+    set_archived,
+    set_group,
+    set_name,
+)
+
+
+def _db():
+    return DatabaseConfig(
+        database="testdb", user="u", password="p",  # noqa: S106
+        **{"schema": "public"},
+    )
+
+
+def test_manifest_defaults(tmp_path):
+    m = create_session("domanda", _db(), tmp_path)
+    assert m.archived is False
+    assert m.group is None
+    assert m.name is None
+
+
+def test_set_name(tmp_path):
+    m = create_session("domanda", _db(), tmp_path)
+    set_name(m.id, "Pazienti 2024", tmp_path)
+    assert load_session(m.id, tmp_path).name == "Pazienti 2024"
+
+
+def test_set_name_empty_clears(tmp_path):
+    m = create_session("domanda", _db(), tmp_path)
+    set_name(m.id, "x", tmp_path)
+    set_name(m.id, "", tmp_path)
+    assert load_session(m.id, tmp_path).name is None
+
+
+def test_set_group_and_clear(tmp_path):
+    m = create_session("domanda", _db(), tmp_path)
+    set_group(m.id, "Aritmologia", tmp_path)
+    assert load_session(m.id, tmp_path).group == "Aritmologia"
+    set_group(m.id, "", tmp_path)
+    assert load_session(m.id, tmp_path).group is None
+
+
+def test_set_archived(tmp_path):
+    m = create_session("domanda", _db(), tmp_path)
+    set_archived(m.id, True, tmp_path)
+    assert load_session(m.id, tmp_path).archived is True
+    set_archived(m.id, False, tmp_path)
+    assert load_session(m.id, tmp_path).archived is False
+
+
+def test_delete_session(tmp_path):
+    m = create_session("domanda", _db(), tmp_path)
+    delete_session(m.id, tmp_path)
+    assert not (tmp_path / m.id).exists()
+    with pytest.raises(SessionError):
+        load_session(m.id, tmp_path)
+
+
+def test_delete_missing_raises(tmp_path):
+    with pytest.raises(SessionError):
+        delete_session("nope", tmp_path)
diff --git a/harness/tht/cli/session_cmd.py b/harness/tht/cli/session_cmd.py
index 95f60962..a5372372 100644
--- a/harness/tht/cli/session_cmd.py
+++ b/harness/tht/cli/session_cmd.py
@@ -44,6 +44,9 @@ def _list_sessions(sessions_root: Path) -> list[dict]:
             "created_at": m.created_at.isoformat(),
             "updated_at": m.updated_at.isoformat() if m.updated_at else None,
             "author": m.author,
+            "name": m.name,
+            "group": m.group,
+            "archived": m.archived,
         })
     out.sort(key=lambda r: r["created_at"], reverse=True)
     return out
diff --git a/harness/tht/session/models.py b/harness/tht/session/models.py
index 6f4107f7..cf25a5f5 100644
--- a/harness/tht/session/models.py
+++ b/harness/tht/session/models.py
@@ -43,6 +43,8 @@ class SessionManifest(_YamlModel):
     model: str | None = None
     thinking: str | None = None
     name: str | None = None
+    archived: bool = False
+    group: str | None = None
 
 
 class Candidate(BaseModel):
diff --git a/harness/tht/session/store.py b/harness/tht/session/store.py
index 33a1f0df..4cbb635c 100644
--- a/harness/tht/session/store.py
+++ b/harness/tht/session/store.py
@@ -1,4 +1,5 @@
 import os
+import shutil
 from datetime import UTC, datetime
 from pathlib import Path
 
@@ -127,3 +128,39 @@ def close_session(session_id: str, sessions_root: Path) -> SessionManifest:
     manifest.updated_by = current_author()
     manifest.to_yaml(sessions_root / session_id / MANIFEST)
     return manifest
+
+
+def _save_touched(manifest: SessionManifest, sessions_root: Path) -> SessionManifest:
+    """Persist `manifest` updating updated_at/updated_by (single save path for mutations)."""
+    manifest.updated_at = datetime.now(UTC)
+    manifest.updated_by = current_author()
+    manifest.to_yaml(sessions_root / manifest.id / MANIFEST)
+    return manifest
+
+
+def set_name(session_id: str, name: str | None, sessions_root: Path) -> SessionManifest:
+    """Set the descriptive name (empty/blank clears it back to None)."""
+    manifest = load_session(session_id, sessions_root)
+    manifest.name = (name or "").strip() or None
+    return _save_touched(manifest, sessions_root)
+
+
+def set_group(session_id: str, group: str | None, sessions_root: Path) -> SessionManifest:
+    """Set the group (empty/blank clears it back to None)."""
+    manifest = load_session(session_id, sessions_root)
+    manifest.group = (group or "").strip() or None
+    return _save_touched(manifest, sessions_root)
+
+
+def set_archived(session_id: str, archived: bool, sessions_root: Path) -> SessionManifest:
+    """Flip the archived flag. Archiving does NOT change resumability (a finalized
+    session stays read-only); unarchive only moves it back to the active list."""
+    manifest = load_session(session_id, sessions_root)
+    manifest.archived = archived
+    return _save_touched(manifest, sessions_root)
+
+
+def delete_session(session_id: str, sessions_root: Path) -> None:
+    """Hard-delete the session directory. SessionError if it does not exist."""
+    load_session(session_id, sessions_root)  # raises SessionError if absent
+    shutil.rmtree(sessions_root / session_id)