refactor: implement token-based context compression mechanism

Major changes:
- Replace message-count-based memory window with token-budget-based compression
- Add max_tokens_input, compression_start_ratio, compression_target_ratio config
- Implement _maybe_compress_history() that triggers based on prompt token usage
- Use _build_compressed_history_view() to provide compressed history to LLM
- Refactor MemoryStore.consolidate() -> consolidate_chunk() for chunk-based compression
- Remove last_consolidated from Session, use _compressed_until metadata instead
- Add background compression scheduling to avoid blocking message processing

Key improvements:
- Compression now based on actual token usage, not arbitrary message counts
- Better handling of long conversations with large context windows
- Non-destructive compression: old messages remain in session, but excluded from prompt
- Automatic compression when history exceeds configured token thresholds

nanobot/agent/loop.py

@@ -5,19 +5,24 @@ from __future__ import annotations
 import asyncio
 import json
 import re
-import weakref
 from contextlib import AsyncExitStack
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Awaitable, Callable
 
 from loguru import logger
 
+try:
+    import tiktoken  # type: ignore
+except Exception:  # pragma: no cover - optional dependency
+    tiktoken = None
+
 from nanobot.agent.context import ContextBuilder
-from nanobot.agent.memory import MemoryStore
 from nanobot.agent.subagent import SubagentManager
 from nanobot.agent.tools.cron import CronTool
 from nanobot.agent.tools.filesystem import EditFileTool, ListDirTool, ReadFileTool, WriteFileTool
+from nanobot.agent.tools.huggingface import HuggingFaceModelSearchTool
 from nanobot.agent.tools.message import MessageTool
+from nanobot.agent.tools.model_config import ValidateDeployJSONTool, ValidateUsageYAMLTool
 from nanobot.agent.tools.registry import ToolRegistry
 from nanobot.agent.tools.shell import ExecTool
 from nanobot.agent.tools.spawn import SpawnTool
@@ -55,8 +60,11 @@ class AgentLoop:
         max_iterations: int = 40,
         temperature: float = 0.1,
         max_tokens: int = 4096,
-        memory_window: int = 100,
+        memory_window: int | None = None,  # backward-compat only (unused)
         reasoning_effort: str | None = None,
+        max_tokens_input: int = 128_000,
+        compression_start_ratio: float = 0.7,
+        compression_target_ratio: float = 0.4,
         brave_api_key: str | None = None,
         web_proxy: str | None = None,
         exec_config: ExecToolConfig | None = None,
@@ -74,9 +82,18 @@ class AgentLoop:
         self.model = model or provider.get_default_model()
         self.max_iterations = max_iterations
         self.temperature = temperature
+        # max_tokens: per-call output token cap (maxTokensOutput in config)
         self.max_tokens = max_tokens
+        # Keep legacy attribute for older call sites/tests; compression no longer uses it.
         self.memory_window = memory_window
         self.reasoning_effort = reasoning_effort
+        # max_tokens_input: model native context window (maxTokensInput in config)
+        self.max_tokens_input = max_tokens_input
+        # Token-based compression watermarks (fractions of available input budget)
+        self.compression_start_ratio = compression_start_ratio
+        self.compression_target_ratio = compression_target_ratio
+        # Reserve tokens for safety margin
+        self._reserve_tokens = 1000
         self.brave_api_key = brave_api_key
         self.web_proxy = web_proxy
         self.exec_config = exec_config or ExecToolConfig()
@@ -105,18 +122,373 @@ class AgentLoop:
         self._mcp_stack: AsyncExitStack | None = None
         self._mcp_connected = False
         self._mcp_connecting = False
-        self._consolidating: set[str] = set()  # Session keys with consolidation in progress
-        self._consolidation_tasks: set[asyncio.Task] = set()  # Strong refs to in-flight tasks
-        self._consolidation_locks: weakref.WeakValueDictionary[str, asyncio.Lock] = weakref.WeakValueDictionary()
         self._active_tasks: dict[str, list[asyncio.Task]] = {}  # session_key -> tasks
+        self._compression_tasks: dict[str, asyncio.Task] = {}  # session_key -> task
         self._processing_lock = asyncio.Lock()
         self._register_default_tools()
 
+    @staticmethod
+    def _estimate_prompt_tokens(
+        messages: list[dict[str, Any]],
+        tools: list[dict[str, Any]] | None = None,
+    ) -> int:
+        """Estimate prompt tokens with tiktoken (fallback only)."""
+        if tiktoken is None:
+            return 0
+
+        try:
+            enc = tiktoken.get_encoding("cl100k_base")
+            parts: list[str] = []
+            for msg in messages:
+                content = msg.get("content")
+                if isinstance(content, str):
+                    parts.append(content)
+                elif isinstance(content, list):
+                    for part in content:
+                        if isinstance(part, dict) and part.get("type") == "text":
+                            txt = part.get("text", "")
+                            if txt:
+                                parts.append(txt)
+            if tools:
+                parts.append(json.dumps(tools, ensure_ascii=False))
+            return len(enc.encode("\n".join(parts)))
+        except Exception:
+            return 0
+
+    def _estimate_prompt_tokens_chain(
+        self,
+        messages: list[dict[str, Any]],
+        tools: list[dict[str, Any]] | None = None,
+    ) -> tuple[int, str]:
+        """Unified prompt-token estimation: provider counter -> tiktoken."""
+        provider_counter = getattr(self.provider, "estimate_prompt_tokens", None)
+        if callable(provider_counter):
+            try:
+                tokens, source = provider_counter(messages, tools, self.model)
+                if isinstance(tokens, (int, float)) and tokens > 0:
+                    return int(tokens), str(source or "provider_counter")
+            except Exception:
+                logger.debug("Provider token counter failed; fallback to tiktoken")
+
+        estimated = self._estimate_prompt_tokens(messages, tools)
+        if estimated > 0:
+            return int(estimated), "tiktoken"
+        return 0, "none"
+
+    @staticmethod
+    def _estimate_completion_tokens(content: str) -> int:
+        """Estimate completion tokens with tiktoken (fallback only)."""
+        if tiktoken is None:
+            return 0
+        try:
+            enc = tiktoken.get_encoding("cl100k_base")
+            return len(enc.encode(content or ""))
+        except Exception:
+            return 0
+
+    def _get_compressed_until(self, session: Session) -> int:
+        """Read/normalize compressed boundary and migrate old metadata format."""
+        raw = session.metadata.get("_compressed_until", 0)
+        try:
+            compressed_until = int(raw)
+        except (TypeError, ValueError):
+            compressed_until = 0
+
+        if compressed_until <= 0:
+            ranges = session.metadata.get("_compressed_ranges")
+            if isinstance(ranges, list):
+                inferred = 0
+                for item in ranges:
+                    if not isinstance(item, (list, tuple)) or len(item) != 2:
+                        continue
+                    try:
+                        inferred = max(inferred, int(item[1]))
+                    except (TypeError, ValueError):
+                        continue
+                compressed_until = inferred
+
+        compressed_until = max(0, min(compressed_until, len(session.messages)))
+        session.metadata["_compressed_until"] = compressed_until
+        # 兼容旧版本：一旦迁移出连续边界，就可以清理旧字段
+        session.metadata.pop("_compressed_ranges", None)
+        session.metadata.pop("_cumulative_tokens", None)
+        return compressed_until
+
+    def _set_compressed_until(self, session: Session, idx: int) -> None:
+        """Persist a contiguous compressed boundary."""
+        session.metadata["_compressed_until"] = max(0, min(int(idx), len(session.messages)))
+        session.metadata.pop("_compressed_ranges", None)
+        session.metadata.pop("_cumulative_tokens", None)
+
+    @staticmethod
+    def _estimate_message_tokens(message: dict[str, Any]) -> int:
+        """Rough token estimate for a single persisted message."""
+        content = message.get("content")
+        parts: list[str] = []
+        if isinstance(content, str):
+            parts.append(content)
+        elif isinstance(content, list):
+            for part in content:
+                if isinstance(part, dict) and part.get("type") == "text":
+                    txt = part.get("text", "")
+                    if txt:
+                        parts.append(txt)
+                else:
+                    parts.append(json.dumps(part, ensure_ascii=False))
+        elif content is not None:
+            parts.append(json.dumps(content, ensure_ascii=False))
+
+        for key in ("name", "tool_call_id"):
+            val = message.get(key)
+            if isinstance(val, str) and val:
+                parts.append(val)
+        if message.get("tool_calls"):
+            parts.append(json.dumps(message["tool_calls"], ensure_ascii=False))
+
+        payload = "\n".join(parts)
+        if not payload:
+            return 1
+        if tiktoken is not None:
+            try:
+                enc = tiktoken.get_encoding("cl100k_base")
+                return max(1, len(enc.encode(payload)))
+            except Exception:
+                pass
+        return max(1, len(payload) // 4)
+
+    def _pick_compression_chunk_by_tokens(
+        self,
+        session: Session,
+        reduction_tokens: int,
+        *,
+        tail_keep: int = 12,
+    ) -> tuple[int, int, int] | None:
+        """
+        Pick one contiguous old chunk so its estimated size is roughly enough
+        to reduce `reduction_tokens`.
+        """
+        messages = session.messages
+        start = self._get_compressed_until(session)
+        if len(messages) - start <= tail_keep + 2:
+            return None
+
+        end_limit = len(messages) - tail_keep
+        if end_limit - start < 2:
+            return None
+
+        target = max(1, reduction_tokens)
+        end = start
+        collected = 0
+        while end < end_limit and collected < target:
+            collected += self._estimate_message_tokens(messages[end])
+            end += 1
+
+        if end - start < 2:
+            end = min(end_limit, start + 2)
+            collected = sum(self._estimate_message_tokens(m) for m in messages[start:end])
+        if end - start < 2:
+            return None
+        return start, end, collected
+
+    def _estimate_session_prompt_tokens(self, session: Session) -> tuple[int, str]:
+        """
+        Estimate current full prompt tokens for this session view
+        (system + compressed history view + runtime/user placeholder + tools).
+        """
+        history = self._build_compressed_history_view(session)
+        channel, chat_id = (session.key.split(":", 1) if ":" in session.key else (None, None))
+        probe_messages = self.context.build_messages(
+            history=history,
+            current_message="[token-probe]",
+            channel=channel,
+            chat_id=chat_id,
+        )
+        return self._estimate_prompt_tokens_chain(probe_messages, self.tools.get_definitions())
+
+    async def _maybe_compress_history(
+        self,
+        session: Session,
+    ) -> None:
+        """
+        End-of-turn policy:
+        - Estimate current prompt usage from persisted session view.
+        - If above start ratio, perform one best-effort compression chunk.
+        """
+        if not session.messages:
+            self._set_compressed_until(session, 0)
+            return
+
+        budget = max(1, self.max_tokens_input - self.max_tokens - self._reserve_tokens)
+        start_threshold = int(budget * self.compression_start_ratio)
+        target_threshold = int(budget * self.compression_target_ratio)
+        if target_threshold >= start_threshold:
+            target_threshold = max(0, start_threshold - 1)
+
+        current_tokens, token_source = self._estimate_session_prompt_tokens(session)
+        current_ratio = current_tokens / budget if budget else 0.0
+        if current_tokens <= 0:
+            logger.debug("Compression skip {}: token estimate unavailable", session.key)
+            return
+        if current_tokens < start_threshold:
+            logger.debug(
+                "Compression idle {}: {}/{} ({:.1%}) via {}",
+                session.key,
+                current_tokens,
+                budget,
+                current_ratio,
+                token_source,
+            )
+            return
+        logger.info(
+            "Compression trigger {}: {}/{} ({:.1%}) via {}",
+            session.key,
+            current_tokens,
+            budget,
+            current_ratio,
+            token_source,
+        )
+
+        reduction_by_target = max(0, current_tokens - target_threshold)
+        reduction_by_delta = max(1, start_threshold - target_threshold)
+        reduction_need = max(reduction_by_target, reduction_by_delta)
+
+        chunk_range = self._pick_compression_chunk_by_tokens(session, reduction_need, tail_keep=10)
+        if chunk_range is None:
+            logger.info("Compression skipped for {}: no compressible chunk", session.key)
+            return
+
+        start_idx, end_idx, estimated_chunk_tokens = chunk_range
+        chunk = session.messages[start_idx:end_idx]
+        if len(chunk) < 2:
+            return
+
+        logger.info(
+            "Compression chunk {}: msgs {}-{} (count={}, est~{}, need~{})",
+            session.key,
+            start_idx,
+            end_idx - 1,
+            len(chunk),
+            estimated_chunk_tokens,
+            reduction_need,
+        )
+        success, _ = await self.context.memory.consolidate_chunk(
+            chunk,
+            self.provider,
+            self.model,
+        )
+        if not success:
+            logger.warning("Compression aborted for {}: consolidation failed", session.key)
+            return
+
+        self._set_compressed_until(session, end_idx)
+        self.sessions.save(session)
+
+        after_tokens, after_source = self._estimate_session_prompt_tokens(session)
+        after_ratio = after_tokens / budget if budget else 0.0
+        reduced = max(0, current_tokens - after_tokens)
+        reduced_ratio = (reduced / current_tokens) if current_tokens > 0 else 0.0
+        logger.info(
+            "Compression done {}: {}/{} ({:.1%}) via {}, reduced={} ({:.1%})",
+            session.key,
+            after_tokens,
+            budget,
+            after_ratio,
+            after_source,
+            reduced,
+            reduced_ratio,
+        )
+
+    def _schedule_background_compression(self, session_key: str) -> None:
+        """Schedule best-effort background compression for a session."""
+        existing = self._compression_tasks.get(session_key)
+        if existing is not None and not existing.done():
+            return
+
+        async def _runner() -> None:
+            session = self.sessions.get_or_create(session_key)
+            try:
+                await self._maybe_compress_history(session)
+            except Exception:
+                logger.exception("Background compression failed for {}", session_key)
+
+        task = asyncio.create_task(_runner())
+        self._compression_tasks[session_key] = task
+
+        def _cleanup(t: asyncio.Task) -> None:
+            cur = self._compression_tasks.get(session_key)
+            if cur is t:
+                self._compression_tasks.pop(session_key, None)
+            try:
+                t.result()
+            except BaseException:
+                pass
+
+        task.add_done_callback(_cleanup)
+
+    async def wait_for_background_compression(self, timeout_s: float | None = None) -> None:
+        """Wait for currently scheduled compression tasks."""
+        pending = [t for t in self._compression_tasks.values() if not t.done()]
+        if not pending:
+            return
+
+        logger.info("Waiting for {} background compression task(s)", len(pending))
+        waiter = asyncio.gather(*pending, return_exceptions=True)
+        if timeout_s is None:
+            await waiter
+            return
+
+        try:
+            await asyncio.wait_for(waiter, timeout=timeout_s)
+        except asyncio.TimeoutError:
+            logger.warning(
+                "Background compression wait timed out after {}s ({} task(s) still running)",
+                timeout_s,
+                len([t for t in self._compression_tasks.values() if not t.done()]),
+            )
+
+    def _build_compressed_history_view(
+        self,
+        session: Session,
+    ) -> list[dict]:
+        """Build non-destructive history view using the compressed boundary."""
+        compressed_until = self._get_compressed_until(session)
+        if compressed_until <= 0:
+            return session.get_history(max_messages=0)
+
+        notice_msg: dict[str, Any] = {
+            "role": "assistant",
+            "content": (
+                "As your assistant, I have compressed earlier context. "
+                "If you need details, please check memory/HISTORY.md."
+            ),
+        }
+
+        tail: list[dict[str, Any]] = []
+        for msg in session.messages[compressed_until:]:
+            entry: dict[str, Any] = {"role": msg["role"], "content": msg.get("content", "")}
+            for k in ("tool_calls", "tool_call_id", "name"):
+                if k in msg:
+                    entry[k] = msg[k]
+            tail.append(entry)
+
+        # Drop leading non-user entries from tail to avoid orphan tool blocks.
+        for i, m in enumerate(tail):
+            if m.get("role") == "user":
+                tail = tail[i:]
+                break
+        else:
+            tail = []
+
+        return [notice_msg, *tail]
+
     def _register_default_tools(self) -> None:
         """Register the default set of tools."""
         allowed_dir = self.workspace if self.restrict_to_workspace else None
         for cls in (ReadFileTool, WriteFileTool, EditFileTool, ListDirTool):
             self.tools.register(cls(workspace=self.workspace, allowed_dir=allowed_dir))
+        self.tools.register(ValidateDeployJSONTool())
+        self.tools.register(ValidateUsageYAMLTool())
+        self.tools.register(HuggingFaceModelSearchTool())
         self.tools.register(ExecTool(
             working_dir=str(self.workspace),
             timeout=self.exec_config.timeout,
@@ -181,25 +553,78 @@ class AgentLoop:
         self,
         initial_messages: list[dict],
         on_progress: Callable[..., Awaitable[None]] | None = None,
-    ) -> tuple[str | None, list[str], list[dict]]:
-        """Run the agent iteration loop. Returns (final_content, tools_used, messages)."""
+    ) -> tuple[str | None, list[str], list[dict], int, str]:
+        """
+        Run the agent iteration loop.
+
+        Returns:
+            (final_content, tools_used, messages, total_tokens_this_turn, token_source)
+            total_tokens_this_turn: total tokens (prompt + completion) for this turn
+            token_source: provider_total / provider_sum / provider_prompt /
+                          provider_counter+tiktoken_completion / tiktoken / none
+        """
         messages = initial_messages
         iteration = 0
         final_content = None
         tools_used: list[str] = []
+        total_tokens_this_turn = 0
+        token_source = "none"
 
         while iteration < self.max_iterations:
             iteration += 1
 
+            tool_defs = self.tools.get_definitions()
+
             response = await self.provider.chat(
                 messages=messages,
-                tools=self.tools.get_definitions(),
+                tools=tool_defs,
                 model=self.model,
                 temperature=self.temperature,
                 max_tokens=self.max_tokens,
                 reasoning_effort=self.reasoning_effort,
             )
 
+            # Prefer provider usage from the turn-ending model call; fallback to tiktoken.
+            # Calculate total tokens (prompt + completion) for this turn.
+            usage = response.usage or {}
+            t_tokens = usage.get("total_tokens")
+            p_tokens = usage.get("prompt_tokens")
+            c_tokens = usage.get("completion_tokens")
+            
+            if isinstance(t_tokens, (int, float)) and t_tokens > 0:
+                total_tokens_this_turn = int(t_tokens)
+                token_source = "provider_total"
+            elif isinstance(p_tokens, (int, float)) and isinstance(c_tokens, (int, float)):
+                # If we have both prompt and completion tokens, sum them
+                total_tokens_this_turn = int(p_tokens) + int(c_tokens)
+                token_source = "provider_sum"
+            elif isinstance(p_tokens, (int, float)) and p_tokens > 0:
+                # Fallback: use prompt tokens only (completion might be 0 for tool calls)
+                total_tokens_this_turn = int(p_tokens)
+                token_source = "provider_prompt"
+            else:
+                # Estimate with unified chain (provider counter -> tiktoken), plus completion tiktoken.
+                estimated_prompt, prompt_source = self._estimate_prompt_tokens_chain(messages, tool_defs)
+                estimated_completion = self._estimate_completion_tokens(response.content or "")
+                total_tokens_this_turn = estimated_prompt + estimated_completion
+                if total_tokens_this_turn > 0:
+                    token_source = (
+                        "tiktoken"
+                        if prompt_source == "tiktoken"
+                        else f"{prompt_source}+tiktoken_completion"
+                    )
+                if total_tokens_this_turn <= 0:
+                    total_tokens_this_turn = 0
+                    token_source = "none"
+
+            logger.debug(
+                "Turn token usage: source={}, total={}, prompt={}, completion={}",
+                token_source,
+                total_tokens_this_turn,
+                p_tokens if isinstance(p_tokens, (int, float)) else None,
+                c_tokens if isinstance(c_tokens, (int, float)) else None,
+            )
+
             if response.has_tool_calls:
                 if on_progress:
                     thought = self._strip_think(response.content)
@@ -254,7 +679,7 @@ class AgentLoop:
                 "without completing the task. You can try breaking the task into smaller steps."
             )
 
-        return final_content, tools_used, messages
+        return final_content, tools_used, messages, total_tokens_this_turn, token_source
 
     async def run(self) -> None:
         """Run the agent loop, dispatching messages as tasks to stay responsive to /stop."""
@@ -279,6 +704,9 @@ class AgentLoop:
         """Cancel all active tasks and subagents for the session."""
         tasks = self._active_tasks.pop(msg.session_key, [])
         cancelled = sum(1 for t in tasks if not t.done() and t.cancel())
+        comp = self._compression_tasks.get(msg.session_key)
+        if comp is not None and not comp.done() and comp.cancel():
+            cancelled += 1
         for t in tasks:
             try:
                 await t
@@ -325,6 +753,9 @@ class AgentLoop:
     def stop(self) -> None:
         """Stop the agent loop."""
         self._running = False
+        for task in list(self._compression_tasks.values()):
+            if not task.done():
+                task.cancel()
         logger.info("Agent loop stopping")
 
     async def _process_message(
@@ -342,14 +773,15 @@ class AgentLoop:
             key = f"{channel}:{chat_id}"
             session = self.sessions.get_or_create(key)
             self._set_tool_context(channel, chat_id, msg.metadata.get("message_id"))
-            history = session.get_history(max_messages=self.memory_window)
+            history = self._build_compressed_history_view(session)
             messages = self.context.build_messages(
                 history=history,
                 current_message=msg.content, channel=channel, chat_id=chat_id,
             )
-            final_content, _, all_msgs = await self._run_agent_loop(messages)
+            final_content, _, all_msgs, _, _ = await self._run_agent_loop(messages)
             self._save_turn(session, all_msgs, 1 + len(history))
             self.sessions.save(session)
+            self._schedule_background_compression(session.key)
             return OutboundMessage(channel=channel, chat_id=chat_id,
                                   content=final_content or "Background task completed.")
 
@@ -362,27 +794,27 @@ class AgentLoop:
         # Slash commands
         cmd = msg.content.strip().lower()
         if cmd == "/new":
-            lock = self._consolidation_locks.setdefault(session.key, asyncio.Lock())
-            self._consolidating.add(session.key)
             try:
-                async with lock:
-                    snapshot = session.messages[session.last_consolidated:]
-                    if snapshot:
-                        temp = Session(key=session.key)
-                        temp.messages = list(snapshot)
-                        if not await self._consolidate_memory(temp, archive_all=True):
-                            return OutboundMessage(
-                                channel=msg.channel, chat_id=msg.chat_id,
-                                content="Memory archival failed, session not cleared. Please try again.",
-                            )
+                # 在清空会话前，将当前完整对话做一次归档压缩到 MEMORY/HISTORY 中
+                if session.messages:
+                    ok, _ = await self.context.memory.consolidate_chunk(
+                        session.messages,
+                        self.provider,
+                        self.model,
+                    )
+                    if not ok:
+                        return OutboundMessage(
+                            channel=msg.channel,
+                            chat_id=msg.chat_id,
+                            content="Memory archival failed, session not cleared. Please try again.",
+                        )
             except Exception:
                 logger.exception("/new archival failed for {}", session.key)
                 return OutboundMessage(
-                    channel=msg.channel, chat_id=msg.chat_id,
+                    channel=msg.channel,
+                    chat_id=msg.chat_id,
                     content="Memory archival failed, session not cleared. Please try again.",
                 )
-            finally:
-                self._consolidating.discard(session.key)
 
             session.clear()
             self.sessions.save(session)
@@ -393,36 +825,23 @@ class AgentLoop:
             return OutboundMessage(channel=msg.channel, chat_id=msg.chat_id,
                                   content="🐈 nanobot commands:\n/new — Start a new conversation\n/stop — Stop the current task\n/help — Show available commands")
 
-        unconsolidated = len(session.messages) - session.last_consolidated
-        if (unconsolidated >= self.memory_window and session.key not in self._consolidating):
-            self._consolidating.add(session.key)
-            lock = self._consolidation_locks.setdefault(session.key, asyncio.Lock())
-
-            async def _consolidate_and_unlock():
-                try:
-                    async with lock:
-                        await self._consolidate_memory(session)
-                finally:
-                    self._consolidating.discard(session.key)
-                    _task = asyncio.current_task()
-                    if _task is not None:
-                        self._consolidation_tasks.discard(_task)
-
-            _task = asyncio.create_task(_consolidate_and_unlock())
-            self._consolidation_tasks.add(_task)
-
         self._set_tool_context(msg.channel, msg.chat_id, msg.metadata.get("message_id"))
         if message_tool := self.tools.get("message"):
             if isinstance(message_tool, MessageTool):
                 message_tool.start_turn()
 
-        history = session.get_history(max_messages=self.memory_window)
+        # 正常对话：使用压缩后的历史视图（压缩在回合结束后进行）
+        history = self._build_compressed_history_view(session)
         initial_messages = self.context.build_messages(
             history=history,
             current_message=msg.content,
             media=msg.media if msg.media else None,
             channel=msg.channel, chat_id=msg.chat_id,
         )
+        # Add [CRON JOB] identifier for cron sessions (session_key starts with "cron:")
+        if session_key and session_key.startswith("cron:"):
+            if initial_messages and initial_messages[0].get("role") == "system":
+                initial_messages[0]["content"] = f"[CRON JOB] {initial_messages[0]['content']}"
 
         async def _bus_progress(content: str, *, tool_hint: bool = False) -> None:
             meta = dict(msg.metadata or {})
@@ -432,7 +851,7 @@ class AgentLoop:
                 channel=msg.channel, chat_id=msg.chat_id, content=content, metadata=meta,
             ))
 
-        final_content, _, all_msgs = await self._run_agent_loop(
+        final_content, _, all_msgs, _, _ = await self._run_agent_loop(
             initial_messages, on_progress=on_progress or _bus_progress,
         )
 
@@ -441,6 +860,7 @@ class AgentLoop:
 
         self._save_turn(session, all_msgs, 1 + len(history))
         self.sessions.save(session)
+        self._schedule_background_compression(session.key)
 
         if (mt := self.tools.get("message")) and isinstance(mt, MessageTool) and mt._sent_in_turn:
             return None
@@ -487,13 +907,6 @@ class AgentLoop:
             session.messages.append(entry)
         session.updated_at = datetime.now()
 
-    async def _consolidate_memory(self, session, archive_all: bool = False) -> bool:
-        """Delegate to MemoryStore.consolidate(). Returns True on success."""
-        return await MemoryStore(self.workspace).consolidate(
-            session, self.provider, self.model,
-            archive_all=archive_all, memory_window=self.memory_window,
-        )
-
     async def process_direct(
         self,
         content: str,

nanobot/agent/memory.py

@@ -66,36 +66,25 @@ class MemoryStore:
         long_term = self.read_long_term()
         return f"## Long-term Memory\n{long_term}" if long_term else ""
 
-    async def consolidate(
+    async def consolidate_chunk(
         self,
-        session: Session,
+        messages: list[dict],
         provider: LLMProvider,
         model: str,
-        *,
-        archive_all: bool = False,
-        memory_window: int = 50,
-    ) -> bool:
-        """Consolidate old messages into MEMORY.md + HISTORY.md via LLM tool call.
+    ) -> tuple[bool, str | None]:
+        """Consolidate a chunk of messages into MEMORY.md + HISTORY.md via LLM tool call.
 
-        Returns True on success (including no-op), False on failure.
+        Returns (success, None).
+
+        - success: True on success (including no-op), False on failure.
+        - The second return value is reserved for future use (e.g. RAG-style summaries) and is
+          always None in the current implementation.
         """
-        if archive_all:
-            old_messages = session.messages
-            keep_count = 0
-            logger.info("Memory consolidation (archive_all): {} messages", len(session.messages))
-        else:
-            keep_count = memory_window // 2
-            if len(session.messages) <= keep_count:
-                return True
-            if len(session.messages) - session.last_consolidated <= 0:
-                return True
-            old_messages = session.messages[session.last_consolidated:-keep_count]
-            if not old_messages:
-                return True
-            logger.info("Memory consolidation: {} to consolidate, {} keep", len(old_messages), keep_count)
+        if not messages:
+            return True, None
 
         lines = []
-        for m in old_messages:
+        for m in messages:
             if not m.get("content"):
                 continue
             tools = f" [tools: {', '.join(m['tools_used'])}]" if m.get("tools_used") else ""
@@ -113,7 +102,19 @@ class MemoryStore:
         try:
             response = await provider.chat(
                 messages=[
-                    {"role": "system", "content": "You are a memory consolidation agent. Call the save_memory tool with your consolidation of the conversation."},
+                    {
+                        "role": "system",
+                        "content": (
+                            "You are a memory consolidation agent.\n"
+                            "Your job is to:\n"
+                            "1) Append a concise but grep-friendly entry to HISTORY.md summarizing key events, decisions and topics.\n"
+                            "   - Write 1 paragraph of 2–5 sentences that starts with [YYYY-MM-DD HH:MM].\n"
+                            "   - Include concrete names, IDs and numbers so it is easy to search with grep.\n"
+                            "2) Update long-term MEMORY.md with stable facts and user preferences as markdown, including all existing facts plus new ones.\n"
+                            "3) Optionally return a short context_summary (1–3 sentences) that will replace the raw messages in future dialogue history.\n\n"
+                            "Always call the save_memory tool with history_entry, memory_update and (optionally) context_summary."
+                        ),
+                    },
                     {"role": "user", "content": prompt},
                 ],
                 tools=_SAVE_MEMORY_TOOL,
@@ -122,7 +123,7 @@ class MemoryStore:
 
             if not response.has_tool_calls:
                 logger.warning("Memory consolidation: LLM did not call save_memory, skipping")
-                return False
+                return False, None
 
             args = response.tool_calls[0].arguments
             # Some providers return arguments as a JSON string instead of dict
@@ -134,10 +135,10 @@ class MemoryStore:
                     args = args[0]
                 else:
                     logger.warning("Memory consolidation: unexpected arguments as empty or non-dict list")
-                    return False
+                    return False, None
             if not isinstance(args, dict):
                 logger.warning("Memory consolidation: unexpected arguments type {}", type(args).__name__)
-                return False
+                return False, None
 
             if entry := args.get("history_entry"):
                 if not isinstance(entry, str):
@@ -149,9 +150,8 @@ class MemoryStore:
                 if update != current_memory:
                     self.write_long_term(update)
 
-            session.last_consolidated = 0 if archive_all else len(session.messages) - keep_count
-            logger.info("Memory consolidation done: {} messages, last_consolidated={}", len(session.messages), session.last_consolidated)
-            return True
+            logger.info("Memory consolidation done for {} messages", len(messages))
+            return True, None
         except Exception:
             logger.exception("Memory consolidation failed")
-            return False
+            return False, None

nanobot/config/schema.py

@@ -189,11 +189,22 @@ class SlackConfig(Base):
 
 
 class QQConfig(Base):
-    """QQ channel configuration using botpy SDK."""
+    """QQ channel configuration.
+    
+    Supports two implementations:
+    1. Official botpy SDK: requires app_id and secret
+    2. OneBot protocol: requires api_url (and optionally ws_reverse_url, bot_qq, access_token)
+    """
 
     enabled: bool = False
+    # Official botpy SDK fields
     app_id: str = ""  # 机器人 ID (AppID) from q.qq.com
     secret: str = ""  # 机器人密钥 (AppSecret) from q.qq.com
+    # OneBot protocol fields
+    api_url: str = ""  # OneBot HTTP API URL (e.g. "http://localhost:5700")
+    ws_reverse_url: str = ""  # OneBot WebSocket reverse URL (e.g. "ws://localhost:8080/ws/reverse")
+    bot_qq: int | None = None  # Bot's QQ number (for filtering self messages)
+    access_token: str = ""  # Optional access token for OneBot API
     allow_from: list[str] = Field(
         default_factory=list
     )  # Allowed user openids (empty = public access)
@@ -226,10 +237,18 @@ class AgentDefaults(Base):
     provider: str = (
         "auto"  # Provider name (e.g. "anthropic", "openrouter") or "auto" for auto-detection
     )
-    max_tokens: int = 8192
+    # 原生上下文最大窗口（通常对应模型的 max_input_tokens / max_context_tokens）
+    # 默认按照主流大模型（如 GPT-4o、Claude 3.x 等）的 128k 上下文给一个宽松上限，实际应根据所选模型文档手动调整。
+    max_tokens_input: int = 128_000
+    # 默认单次回复的最大输出 token 上限（调用时可按需要再做截断或比例分配）
+    # 8192 足以覆盖大多数实际对话/工具使用场景，同样可按需手动调整。
+    max_tokens_output: int = 8192
+    # 会话历史压缩触发比例：当估算的输入 token 使用量 >= maxTokensInput * compressionStartRatio 时开始压缩。
+    compression_start_ratio: float = 0.7
+    # 会话历史压缩目标比例：每轮压缩后尽量把估算的输入 token 使用量压到 maxTokensInput * compressionTargetRatio 附近。
+    compression_target_ratio: float = 0.4
     temperature: float = 0.1
     max_tool_iterations: int = 40
-    memory_window: int = 100
     reasoning_effort: str | None = None  # low / medium / high — enables LLM thinking mode
 
 

nanobot/session/manager.py

@@ -9,7 +9,6 @@ from typing import Any
 
 from loguru import logger
 
-from nanobot.config.paths import get_legacy_sessions_dir
 from nanobot.utils.helpers import ensure_dir, safe_filename
 
 
@@ -30,7 +29,6 @@ class Session:
     created_at: datetime = field(default_factory=datetime.now)
     updated_at: datetime = field(default_factory=datetime.now)
     metadata: dict[str, Any] = field(default_factory=dict)
-    last_consolidated: int = 0  # Number of messages already consolidated to files
 
     def add_message(self, role: str, content: str, **kwargs: Any) -> None:
         """Add a message to the session."""
@@ -44,9 +42,13 @@ class Session:
         self.updated_at = datetime.now()
 
     def get_history(self, max_messages: int = 500) -> list[dict[str, Any]]:
-        """Return unconsolidated messages for LLM input, aligned to a user turn."""
-        unconsolidated = self.messages[self.last_consolidated:]
-        sliced = unconsolidated[-max_messages:]
+        """
+        Return messages for LLM input, aligned to a user turn.
+
+        - max_messages > 0 时只保留最近 max_messages 条；
+        - max_messages <= 0 时不做条数截断，返回全部消息。
+        """
+        sliced = self.messages if max_messages <= 0 else self.messages[-max_messages:]
 
         # Drop leading non-user messages to avoid orphaned tool_result blocks
         for i, m in enumerate(sliced):
@@ -66,7 +68,7 @@ class Session:
     def clear(self) -> None:
         """Clear all messages and reset session to initial state."""
         self.messages = []
-        self.last_consolidated = 0
+        self.metadata = {}
         self.updated_at = datetime.now()
 
 
@@ -80,7 +82,7 @@ class SessionManager:
     def __init__(self, workspace: Path):
         self.workspace = workspace
         self.sessions_dir = ensure_dir(self.workspace / "sessions")
-        self.legacy_sessions_dir = get_legacy_sessions_dir()
+        self.legacy_sessions_dir = Path.home() / ".nanobot" / "sessions"
         self._cache: dict[str, Session] = {}
 
     def _get_session_path(self, key: str) -> Path:
@@ -132,7 +134,6 @@ class SessionManager:
             messages = []
             metadata = {}
             created_at = None
-            last_consolidated = 0
 
             with open(path, encoding="utf-8") as f:
                 for line in f:
@@ -145,7 +146,6 @@ class SessionManager:
                     if data.get("_type") == "metadata":
                         metadata = data.get("metadata", {})
                         created_at = datetime.fromisoformat(data["created_at"]) if data.get("created_at") else None
-                        last_consolidated = data.get("last_consolidated", 0)
                     else:
                         messages.append(data)
 
@@ -154,7 +154,6 @@ class SessionManager:
                 messages=messages,
                 created_at=created_at or datetime.now(),
                 metadata=metadata,
-                last_consolidated=last_consolidated
             )
         except Exception as e:
             logger.warning("Failed to load session {}: {}", key, e)
@@ -171,7 +170,6 @@ class SessionManager:
                 "created_at": session.created_at.isoformat(),
                 "updated_at": session.updated_at.isoformat(),
                 "metadata": session.metadata,
-                "last_consolidated": session.last_consolidated
             }
             f.write(json.dumps(metadata_line, ensure_ascii=False) + "\n")
             for msg in session.messages: