环境信息

• msAgent版本：0.1.3
• deepagents版本：latest
• LangChain版本：latest
• OS：Linux（WSL2）

🐛 问题描述

问题描述

environments.md 提示词后缀包含了 {...} 占位符变量，例如 {working_dir}、{platform}、{os_version}、{current_date_time_zoned} 和 {local_environment_context}。这些占位符本应用 AgentContext.template_vars 中的运行时值替换。

然而，在主Agent流程中，这些占位符以字面量形式直接发送给了LLM，没有经过替换。LLM收到的是原始的占位符字符串（如 {current_date_time_zoned}），而不是实际的值（如 2026-05-23 22:31:27 CST）。

问题日志

在src/msagent/agents/factory.py中添加调试中间件：

class _DebugModelMiddleware(AgentMiddleware[Any, Any, Any]):
    """Debug middleware that prints the full model request before sending to the LLM."""

    def _print_request(self, request):
        print("\n" + "=" * 80)
        print("🔍 DEBUG: Model Request (before LLM call)")
        print("=" * 80)

        # System message
        sys_msg = getattr(request, "system_message", None)
        if sys_msg is not None:
            content = sys_msg.content if hasattr(sys_msg, "content") else str(sys_msg)
            print(f"\n📋 System Message ({len(content)} chars):")
            print("-" * 60)
            print(content)
            print("-" * 60)
        else:
            print("\n📋 System Message: None")

        # Messages
        messages = getattr(request, "messages", []) or []
        print(f"\n💬 Messages ({len(messages)} total):")
        for i, msg in enumerate(messages):
            role = getattr(msg, "type", type(msg).__name__)
            content = getattr(msg, "content", str(msg))
            content_str = str(content) if content else ""
            trunc = content_str[:300] + "..." if len(content_str) > 300 else content_str
            # Replace newlines for compact display
            trunc_one_line = trunc.replace("\n", "\\n")
            print(f"  [{i}] {role}: {trunc_one_line}")

        # Runtime context
        runtime = getattr(request, "runtime", None)
        if runtime is not None:
            ctx = getattr(runtime, "context", None)
            if ctx is not None:
                print(f"\n🔧 Runtime Context type: {type(ctx).__name__}")
                if hasattr(ctx, "template_vars"):
                    print(f"   template_vars: {ctx.template_vars}")

        # Tools
        tools = getattr(request, "tools", []) or []
        print(f"\n🛠️  Tools ({len(tools)}): {[getattr(t, 'name', str(t)) for t in tools[:10]]}")

        print("=" * 80 + "\n")

    def wrap_model_call(self, request, handler):
        self._print_request(request)
        return handler(request)

    async def awrap_model_call(self, request, handler):
        self._print_request(request)
        return await handler(request)

然后middleware.append(_DebugModelMiddleware())进行临时调试，采集到日志：
35b46d526fd548299ea0ce79dd3ca6ef.log

预期行为

系统提示中的占位符变量应在发送给LLM之前，被AgentContext.template_vars中的实际运行时值替换：