Support tool config in yaml

app/config.py

@@ -95,6 +95,7 @@ _AGENT_SETTING_KEYS = {
     "duplex_system_prompt",
     "barge_in_min_duration_ms",
     "barge_in_silence_tolerance_ms",
+    "tools",
 }
 _BASE_REQUIRED_AGENT_SETTING_KEYS = {
     "vad_type",
@@ -239,6 +240,11 @@ def _normalize_agent_overrides(raw: Dict[str, Any]) -> Dict[str, Any]:
                 "Section 'siliconflow' is no longer supported. "
                 "Move provider-specific fields into agent.llm / agent.asr / agent.tts."
             )
+        if key == "tools":
+            if not isinstance(value, list):
+                raise ValueError("Agent config key 'tools' must be a list")
+            normalized["tools"] = value
+            continue
         section_map = _AGENT_SECTION_KEY_MAP.get(key)
         if section_map is None:
             normalized[key] = value
@@ -444,6 +450,10 @@ class Settings(BaseSettings):
         description="How much silence (ms) is tolerated during potential barge-in before reset"
     )
 
+    # Optional tool declarations from agent YAML.
+    # Supports OpenAI function schema style entries and/or shorthand string names.
+    tools: List[Any] = Field(default_factory=list, description="Default tool definitions for runtime")
+
     # Logging
     log_level: str = Field(default="INFO", description="Logging level")
     log_format: str = Field(default="json", description="Log format (json or text)")