make ai follow-up suggestions optional (#3591)

backend/packages/harness/deerflow/config/app_config.py

@@ -28,6 +28,7 @@ from deerflow.config.skill_evolution_config import SkillEvolutionConfig
 from deerflow.config.skills_config import SkillsConfig
 from deerflow.config.stream_bridge_config import StreamBridgeConfig, load_stream_bridge_config_from_dict
 from deerflow.config.subagents_config import SubagentsAppConfig, load_subagents_config_from_dict
+from deerflow.config.suggestions_config import SuggestionsConfig
 from deerflow.config.summarization_config import SummarizationConfig, load_summarization_config_from_dict
 from deerflow.config.title_config import TitleConfig, load_title_config_from_dict
 from deerflow.config.token_usage_config import TokenUsageConfig
@@ -116,6 +117,7 @@ class AppConfig(BaseModel):
     acp_agents: dict[str, ACPAgentConfig] = Field(default_factory=dict, description="ACP-compatible agent configuration")
     subagents: SubagentsAppConfig = Field(default_factory=SubagentsAppConfig, description="Subagent runtime configuration")
     guardrails: GuardrailsConfig = Field(default_factory=GuardrailsConfig, description="Guardrail middleware configuration")
+    suggestions: SuggestionsConfig = Field(default_factory=SuggestionsConfig, description="Follow-up suggestions configuration.")
     circuit_breaker: CircuitBreakerConfig = Field(default_factory=CircuitBreakerConfig, description="LLM circuit breaker configuration")
     channel_connections: ChannelConnectionsConfig = Field(
         default_factory=ChannelConnectionsConfig,

backend/packages/harness/deerflow/config/suggestions_config.py

@@ -0,0 +1,7 @@
+from pydantic import BaseModel, Field
+
+
+class SuggestionsConfig(BaseModel):
+    """Configuration for automatic follow-up suggestions."""
+
+    enabled: bool = Field(default=True, description="Whether to enable follow-up question suggestions at the end of an AI response")