diff --git a/astrbot/core/agent/runners/tool_loop_agent_runner.py b/astrbot/core/agent/runners/tool_loop_agent_runner.py
index 89f5ff3ed..db26e37af 100644
--- a/astrbot/core/agent/runners/tool_loop_agent_runner.py
+++ b/astrbot/core/agent/runners/tool_loop_agent_runner.py
@@ -125,9 +125,9 @@ class ToolLoopAgentRunner(BaseAgentRunner[TContext]):
         # TODO: 2. after LLM output a tool call
         self.context_config = ContextConfig(
             # <=0 will never do compress
-            max_context_tokens=provider.provider_config.get("max_context_tokens", 0),
+            max_context_tokens=provider.provider_config.get("max_context_tokens", 4096),
             # enforce max turns before compression
-            enforce_max_turns=self.enforce_max_turns,
+            enforce_max_turns=self.enforce_max_turns if self.enforce_max_turns != -1 else 15,,
             truncate_turns=self.truncate_turns,
             llm_compress_instruction=self.llm_compress_instruction,
             llm_compress_keep_recent=self.llm_compress_keep_recent,