{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/tale-dev/main/json-schema/tale-dev-message-schema.json",
  "title": "Message",
  "x-generated": "2026-10-09",
  "x-method": "derived",
  "x-generator": "derive-json-schema.py",
  "x-source": "openapi/tale-dev-openapi.yml#/components/schemas/Message",
  "type": "object",
  "required": [
    "id",
    "role",
    "parts",
    "sequence",
    "status",
    "createdAt"
  ],
  "properties": {
    "id": {
      "type": "string"
    },
    "role": {
      "type": "string",
      "enum": [
        "user",
        "assistant"
      ]
    },
    "parts": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/MessagePart"
      },
      "description": "The message parts, in order"
    },
    "sequence": {
      "type": "integer",
      "description": "The paging key"
    },
    "status": {
      "type": "string",
      "enum": [
        "pending",
        "complete",
        "failed",
        "cancelled"
      ],
      "description": "`pending` is the placeholder a running turn fills in (the row GET …/generation names as messageId); `complete` is a settled reply — a reply the output cap cut short included, so read `finishReason` for that; `cancelled` is a turn stopped through DELETE …/generation — `parts` and `usage` hold what had streamed; `failed` carries `error`, and `usage` when the turn had consumed any."
    },
    "finishReason": {
      "type": "string",
      "enum": [
        "stop",
        "length",
        "tool-calls",
        "content-filter",
        "cancelled",
        "other"
      ],
      "description": "Why the turn stopped, on a settled assistant message, in one vocabulary over every provider: `stop` (a natural end), `length` (the `maxOutputTokens` cap or the model’s own ceiling cut a round of this reply short — the final text, or, in a tool-calling turn, the tool calls of an earlier round: every call of that round is withheld, its tool-result reads `status: \"invalid_args\"` — the message saying whether its arguments were cut or complete — and the final text may be whole; the status still reads `complete`), `tool-calls` (the final round ended on tool calls), `content-filter` (the provider’s or the platform’s filter), `cancelled` (stopped through DELETE …/generation), `other` (a reason the provider named that has no bucket here). Absent when the provider reported none."
    },
    "model": {
      "type": "string"
    },
    "providerSlug": {
      "type": "string"
    },
    "blockedReason": {
      "type": "string"
    },
    "error": {
      "type": "string",
      "description": "Why a failed turn produced no reply"
    },
    "errorCode": {
      "type": "string",
      "enum": [
        "missing_api_key",
        "credit_exhausted",
        "model_not_entitled",
        "auth_error",
        "model_not_found",
        "unsupported_parameter",
        "output_cap_too_high",
        "token_limit",
        "rate_limited",
        "content_filter",
        "context_length",
        "tool_failure",
        "provider_unreachable",
        "provider_error",
        "thread_busy",
        "budget_exceeded",
        "generic"
      ],
      "description": "Stable chat error classification when available. `credit_exhausted` and `model_not_entitled` mean the provider account, not the request; neither is `rate_limited`. `budget_exceeded` means a budget cap that binds the key holder was reached after the send was accepted, so the turn never ran; a send made once a cap is reached is refused up front with 429 `BUDGET_EXCEEDED`."
    },
    "usage": {
      "type": "object",
      "additionalProperties": false,
      "description": "The token counters the finished turn recorded and the catalog cost estimate stamped beside them; absent until the turn settles. A failed turn carries what it consumed — its finished model rounds and, if the provider had already accepted the request, the round that failed; a round the provider refused (an HTTP error status, or a refusal such as a rate limit reported before any answer or positive reported usage) adds nothing, so a turn refused on its first round carries none. Counts are the provider’s own unless `estimated` is present.",
      "properties": {
        "inputTokens": {
          "type": "integer",
          "description": "Prompt tokens — the assistant’s instructions and tool schemas included"
        },
        "outputTokens": {
          "type": "integer",
          "description": "Reply tokens, the reasoning share included"
        },
        "cachedInputTokens": {
          "type": "integer",
          "description": "The share of `inputTokens` the provider served from its prompt cache"
        },
        "reasoningTokens": {
          "type": "integer",
          "description": "The share of `outputTokens` spent thinking before the reply — absent when the provider reported no count (a `0` is a reported zero)"
        },
        "costEstimateCents": {
          "type": "number",
          "minimum": 0,
          "description": "The turn’s cost in US cents (fractional) from the catalog price the organization ledger also books — the same figure as the ledger; absent when the catalog publishes no price for the model. Cached input is priced at the input rate, so on a cached turn the figure is an upper bound; estimated when the provider’s count was lost (`estimated`)."
        },
        "estimated": {
          "type": "boolean",
          "enum": [
            true
          ],
          "description": "Present when the counts are the platform’s own estimate — the provider’s usage frame was lost (a cancelled turn, or one that failed mid-stream, typically) or never sent — so the cost is an estimate too"
        },
        "stepLimitHit": {
          "type": "boolean",
          "enum": [
            true
          ],
          "description": "Present when the tool loop spent its whole round budget and the final round had tools withheld — the answer may have been forced"
        }
      }
    },
    "createdAt": {
      "type": "integer",
      "minimum": 0,
      "description": "Epoch ms — when the row was created (for an assistant row, when its turn started)"
    }
  },
  "$defs": {
    "ApprovalPart": {
      "type": "object",
      "required": [
        "type",
        "approvalId",
        "question"
      ],
      "properties": {
        "type": {
          "type": "string",
          "enum": [
            "approval"
          ]
        },
        "approvalId": {
          "type": "string"
        },
        "question": {
          "type": "string"
        },
        "decision": {
          "type": "string",
          "enum": [
            "approved",
            "rejected"
          ]
        }
      }
    },
    "AttachmentPart": {
      "type": "object",
      "required": [
        "type",
        "name",
        "mediaType"
      ],
      "properties": {
        "type": {
          "type": "string",
          "enum": [
            "attachment"
          ]
        },
        "name": {
          "type": "string"
        },
        "mediaType": {
          "type": "string"
        },
        "fileId": {
          "type": "string"
        },
        "sizeBytes": {
          "type": "integer"
        },
        "url": {
          "type": "string"
        },
        "text": {
          "type": "string",
          "description": "Extracted text, when any"
        }
      }
    },
    "MessagePart": {
      "description": "One ordered piece of a message, discriminated by `type`: the `mapping` names the schema each kind validates against (`TextPart` … `ApprovalPart`), so a discriminator-honouring validator resolves every part. The kinds listed are the vocabulary as of this version; the set is additive, so a client renders a kind it does not know as opaque.",
      "oneOf": [
        {
          "$ref": "#/$defs/TextPart"
        },
        {
          "$ref": "#/$defs/ReasoningPart"
        },
        {
          "$ref": "#/$defs/AttachmentPart"
        },
        {
          "$ref": "#/$defs/ToolCallPart"
        },
        {
          "$ref": "#/$defs/ToolResultPart"
        },
        {
          "$ref": "#/$defs/ApprovalPart"
        }
      ]
    },
    "ReasoningPart": {
      "type": "object",
      "required": [
        "type",
        "text"
      ],
      "description": "The model’s reasoning ahead of its reply — display-only, never replayed to the model; it may quote the assistant’s own instructions verbatim, so it is not safe to render as the answer.",
      "properties": {
        "type": {
          "type": "string",
          "enum": [
            "reasoning"
          ]
        },
        "text": {
          "type": "string"
        }
      }
    },
    "TextPart": {
      "type": "object",
      "required": [
        "type",
        "text"
      ],
      "properties": {
        "type": {
          "type": "string",
          "enum": [
            "text"
          ]
        },
        "text": {
          "type": "string"
        }
      }
    },
    "ToolCallPart": {
      "type": "object",
      "required": [
        "type",
        "callId",
        "capabilityId",
        "input"
      ],
      "properties": {
        "type": {
          "type": "string",
          "enum": [
            "tool-call"
          ]
        },
        "callId": {
          "type": "string"
        },
        "capabilityId": {
          "type": "string"
        },
        "input": {}
      }
    },
    "ToolResultPart": {
      "type": "object",
      "required": [
        "type",
        "callId",
        "capabilityId",
        "output",
        "structured"
      ],
      "properties": {
        "type": {
          "type": "string",
          "enum": [
            "tool-result"
          ]
        },
        "callId": {
          "type": "string"
        },
        "capabilityId": {
          "type": "string"
        },
        "output": {},
        "structured": {
          "type": "boolean",
          "description": "False when the capability declares no output schema"
        }
      }
    }
  }
}