fix(dream): restore cursor with memory state

Track the Dream cursor in memory versioning so restores do not skip history after rolling back Dream commits.

Co-authored-by: Cursor <cursoragent@cursor.com>

nanobot/agent/memory.py

@@ -8,19 +8,24 @@ import os
 import re
 import weakref
 from contextlib import suppress
-import tiktoken
 from datetime import datetime
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Callable, Iterator
 
+import tiktoken
 from loguru import logger
 
-from nanobot.utils.prompt_templates import render_template
-from nanobot.utils.helpers import ensure_dir, estimate_message_tokens, estimate_prompt_tokens_chain, strip_think, truncate_text
-
-from nanobot.agent.runner import AgentRunSpec, AgentRunner
+from nanobot.agent.runner import AgentRunner, AgentRunSpec
 from nanobot.agent.tools.registry import ToolRegistry
 from nanobot.utils.gitstore import GitStore
+from nanobot.utils.helpers import (
+    ensure_dir,
+    estimate_message_tokens,
+    estimate_prompt_tokens_chain,
+    strip_think,
+    truncate_text,
+)
+from nanobot.utils.prompt_templates import render_template
 
 if TYPE_CHECKING:
     from nanobot.providers.base import LLMProvider
@@ -55,7 +60,7 @@ class MemoryStore:
         self._corruption_logged = False  # rate-limit non-int cursor warning
         self._oversize_logged = False  # rate-limit oversized-entry warning
         self._git = GitStore(workspace, tracked_files=[
-            "SOUL.md", "USER.md", "memory/MEMORY.md",
+            "SOUL.md", "USER.md", "memory/MEMORY.md", "memory/.dream_cursor",
         ])
         self._maybe_migrate_legacy_history()
 
@@ -350,7 +355,7 @@ class MemoryStore:
                 read_size = min(size, 4096)
                 f.seek(size - read_size)
                 data = f.read().decode("utf-8")
-                lines = [l for l in data.split("\n") if l.strip()]
+                lines = [line for line in data.split("\n") if line.strip()]
                 if not lines:
                     return None
                 return json.loads(lines[-1])
@@ -780,7 +785,7 @@ class Dream:
 
         from nanobot.agent.skills import BUILTIN_SKILLS_DIR
 
-        _DESC_RE = _re.compile(r"^description:\s*(.+)$", _re.MULTILINE | _re.IGNORECASE)
+        desc_re = _re.compile(r"^description:\s*(.+)$", _re.MULTILINE | _re.IGNORECASE)
         entries: dict[str, str] = {}
         for base in (self.store.workspace / "skills", BUILTIN_SKILLS_DIR):
             if not base.exists():
@@ -795,7 +800,7 @@ class Dream:
                 if d.name in entries and base == BUILTIN_SKILLS_DIR:
                     continue
                 content = skill_md.read_text(encoding="utf-8")[:500]
-                m = _DESC_RE.search(content)
+                m = desc_re.search(content)
                 desc = m.group(1).strip() if m else "(no description)"
                 entries[d.name] = desc
         return [f"{name} — {desc}" for name, desc in sorted(entries.items())]

tests/agent/test_memory_store.py

@@ -5,7 +5,7 @@ from datetime import datetime
 
 import pytest
 
-from nanobot.agent.memory import MemoryStore, _HISTORY_ENTRY_HARD_CAP
+from nanobot.agent.memory import _HISTORY_ENTRY_HARD_CAP, MemoryStore
 
 
 @pytest.fixture
@@ -241,6 +241,26 @@ class TestDreamCursor:
         store2 = MemoryStore(store.workspace)
         assert store2.get_last_dream_cursor() == 3
 
+    def test_git_restore_rolls_back_dream_cursor(self, tmp_path):
+        store = MemoryStore(tmp_path)
+        store.write_memory("before")
+        store.set_last_dream_cursor(1)
+        assert store.git.init() is True
+
+        store.write_memory("after")
+        store.set_last_dream_cursor(2)
+        dream_sha = store.git.auto_commit("dream: update")
+        assert dream_sha is not None
+
+        store.write_memory("newer")
+        store.set_last_dream_cursor(3)
+
+        restore_sha = store.git.revert(dream_sha)
+
+        assert restore_sha is not None
+        assert store.read_memory() == "before"
+        assert store.get_last_dream_cursor() == 1
+
 
 class TestLegacyHistoryMigration:
     def test_read_unprocessed_history_handles_entries_without_cursor(self, store):