curl --request GET \
  --url https://api.braintrust.dev/v1/function/{function_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "_xact_id": "<string>",
  "project_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "log_id": "p",
  "org_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "slug": "<string>",
  "function_data": {
    "type": "prompt"
  },
  "description": "<string>",
  "created": "2023-11-07T05:31:56Z",
  "prompt_data": {
    "prompt": {
      "type": "chat",
      "messages": [
        {
          "role": "system",
          "content": "",
          "name": "<string>"
        }
      ],
      "tools": "<string>"
    },
    "options": {
      "model": "<string>",
      "params": {
        "use_cache": true,
        "reasoning_enabled": true,
        "reasoning_budget": 123,
        "temperature": 123,
        "top_p": 123,
        "max_tokens": 123,
        "max_completion_tokens": 123,
        "frequency_penalty": 123,
        "presence_penalty": 123,
        "response_format": {
          "type": "json_object"
        },
        "tool_choice": "auto",
        "function_call": "auto",
        "n": 123,
        "stop": [
          "<string>"
        ],
        "reasoning_effort": "none",
        "verbosity": "low"
      },
      "position": "<string>"
    },
    "parser": {
      "type": "llm_classifier",
      "use_cot": true,
      "choice_scores": {}
    },
    "tool_functions": [
      {
        "type": "function",
        "id": "<string>"
      }
    ],
    "mcp": {},
    "origin": {
      "prompt_id": "<string>",
      "project_id": "<string>",
      "prompt_version": "<string>"
    }
  },
  "tags": [
    "<string>"
  ],
  "metadata": {},
  "function_type": "llm",
  "origin": {
    "object_type": "organization",
    "object_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "internal": true
  },
  "function_schema": {
    "parameters": "<unknown>",
    "returns": "<unknown>"
  }
}