refactor: convert AgentDef from dataclass to Pydantic BaseModel

agents/definitions.py

@@ -4,12 +4,12 @@ Agent data is loaded from config.yaml. The AGENTS dict, AGENT_COLORS,
 AGENT_NAMES, and AGENT_AVATARS are kept for backward compatibility.
 """
 
-from dataclasses import dataclass
+from pydantic import BaseModel
+
 from config.settings import settings
 
 
-@dataclass
-class AgentDef:
+class AgentDef(BaseModel):
     """Definition of a chat agent."""
     id: str
     name: str

tests/test_types.py

@@ -1,5 +1,6 @@
 """Tests for core/types.py — enums, dataclasses, ABC."""
 import pytest
+from agents.definitions import AgentDef
 from core.types import BackendName, AgentId, AgentResponse, ChatResult, LLMBackend
 
 
@@ -86,3 +87,16 @@ class TestLLMBackendABC:
         system, rest = LLMBackend.split_system_message(msgs)
         assert system == ""
         assert len(rest) == 1
+
+
+class TestAgentDefModel:
+    def test_create(self):
+        ad = AgentDef(id="design", name="Design", role="Designer", color="#fff", avatar="D", goal="g", backstory="b")
+        assert ad.id == "design"
+        assert ad.name == "Design"
+
+    def test_model_dump(self):
+        ad = AgentDef(id="cad", name="CAD", role="Coder", color="#000", avatar="C", goal="g", backstory="b")
+        d = ad.model_dump()
+        assert d["id"] == "cad"
+        assert "role" in d