{
  "fixture_id": "FX_AgentChat.Handler.NullContext",
  "verifies": "AgentChat.LangGraph.Handler",
  "edge": "null_uicontext",
  "input": {
    "message": {"text": "Show capabilities"},
    "history": [],
    "conversation_id": "test-conv-001",
    "uicontext_str": null,
    "user_id": "user-001",
    "user_jwt": "valid-jwt",
    "env_id": "ss-dev"
  },
  "expected": {
    "tool_count": 22,
    "uicontext_injected": false,
    "streaming": true
  }
}