{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://sediment.so/schemas/facts/inference-message/v1.json",
  "title": "InferenceMessage",
  "description": "One ordered message in an inference call.",
  "type": "object",
  "properties": {
    "role": {
      "type": "string",
      "description": "The message author role, such as `system`, `user`, `assistant`, or `tool`."
    },
    "parts": {
      "type": "array",
      "items": {
        "anyOf": [
          {
            "$ref": "#/$defs/TextPart"
          },
          {
            "$ref": "#/$defs/ReasoningPart"
          },
          {
            "$ref": "#/$defs/ToolCallPart"
          },
          {
            "$ref": "#/$defs/ToolCallResponsePart"
          }
        ]
      },
      "description": "Ordered text, reasoning, tool-call, or tool-response parts."
    },
    "finish_reason": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "description": "The model service's finish reason when reported."
    }
  },
  "additionalProperties": false,
  "required": [
    "role",
    "parts",
    "finish_reason"
  ],
  "$defs": {
    "TextPart": {
      "type": "object",
      "properties": {
        "type": {
          "const": "text",
          "type": "string",
          "description": "The message-part discriminator."
        },
        "content": {
          "type": "string",
          "description": "Plain text, without JSON encoding around it."
        }
      },
      "additionalProperties": false,
      "required": [
        "type",
        "content"
      ]
    },
    "ReasoningPart": {
      "type": "object",
      "properties": {
        "type": {
          "const": "reasoning",
          "type": "string",
          "description": "The message-part discriminator."
        },
        "content": {
          "type": "string",
          "description": "Readable model reasoning. Opaque provider state remains on the fact's `raw` payload."
        }
      },
      "additionalProperties": false,
      "required": [
        "type",
        "content"
      ]
    },
    "ToolCallPart": {
      "type": "object",
      "properties": {
        "type": {
          "const": "tool_call",
          "type": "string",
          "description": "The message-part discriminator."
        },
        "id": {
          "type": "string",
          "description": "The agent-visible tool-call id. It is separate from `model_call_id`."
        },
        "name": {
          "type": "string",
          "description": "The tool the model requested."
        },
        "arguments": {
          "type": "object",
          "additionalProperties": {},
          "description": "The parsed argument object. Malformed wire arguments become `{}`; the original stays on `InferenceCall.raw`."
        }
      },
      "additionalProperties": false,
      "required": [
        "type",
        "id",
        "name",
        "arguments"
      ]
    },
    "ToolCallResponsePart": {
      "type": "object",
      "properties": {
        "type": {
          "const": "tool_call_response",
          "type": "string",
          "description": "The message-part discriminator."
        },
        "id": {
          "type": "string",
          "description": "The tool-call id this result answers."
        },
        "result": {
          "description": "The structured tool result supplied to the model."
        }
      },
      "additionalProperties": false,
      "required": [
        "type",
        "id",
        "result"
      ]
    }
  }
}