{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/octen-ai/main/json-schema/octen-ai-deep-research-chunk-schema.json",
  "title": "DeepResearchChunk",
  "description": "A streaming chunk of a Deep Research response.",
  "x-generated": "2026-10-07",
  "x-method": "derived",
  "x-generator": "derive-json-schema.py",
  "x-source": "openapi/octen-ai-openapi.yml#/components/schemas/DeepResearchChunk",
  "type": "object",
  "required": [
    "request_id",
    "created"
  ],
  "properties": {
    "type": {
      "type": "string",
      "enum": [
        "status",
        "plan",
        "queries",
        "search_done",
        "analysis",
        "brief",
        "content",
        "visual",
        "html_delta",
        "html",
        "finish",
        "usage",
        "error"
      ],
      "description": "The type of this streaming chunk. On the `pro-visual` tier, `html_delta` chunks stream an HTML version of the report after the report content completes, and a final `html` chunk marks the end of that stream."
    },
    "request_id": {
      "type": "string",
      "description": "The unique identifier for this request."
    },
    "object": {
      "type": "string",
      "enum": [
        "research.chunk"
      ],
      "description": "The object type, always `research.chunk`."
    },
    "created": {
      "type": "number",
      "description": "Unix timestamp (in seconds) of when the chunk was created."
    },
    "round": {
      "type": "integer",
      "description": "Current research round. Present only in `queries`, `search_done`, and `analysis` chunks."
    },
    "latency": {
      "type": "integer",
      "description": "Latency in milliseconds for the stage represented by this chunk."
    },
    "status": {
      "type": "string",
      "description": "Pipeline progress copy. Present only in `status` chunks."
    },
    "plan": {
      "$ref": "#/$defs/DeepResearchPlan"
    },
    "plan_id": {
      "type": "string",
      "description": "Plan ID carried by `plan` chunks. The client must echo this back as `plan_id` when entering Phase 2."
    },
    "queries": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Sub-queries generated for this round. Present only in `queries` chunks."
    },
    "search_result_count": {
      "type": "integer",
      "description": "Total number of search results returned this round. Present only in `search_done` chunks."
    },
    "search_results": {
      "type": "array",
      "description": "Search results for this round, one group per sub-query. Present only in `search_done` chunks.",
      "items": {
        "$ref": "#/$defs/SearchResultGroup"
      }
    },
    "analysis": {
      "$ref": "#/$defs/DeepResearchAnalysis"
    },
    "brief": {
      "$ref": "#/$defs/DeepResearchBrief"
    },
    "choices": {
      "type": "array",
      "description": "Incremental choices for the final report. Present in `content` and `finish` chunks.",
      "items": {
        "$ref": "#/$defs/DeepResearchChunkChoice"
      }
    },
    "visual": {
      "allOf": [
        {
          "$ref": "#/$defs/DeepResearchVisual"
        }
      ],
      "description": "Visual material for one report section. Present only in `visual` chunks, emitted on the `pro-visual` tier."
    },
    "html_delta": {
      "type": "object",
      "description": "An incremental fragment of the HTML report. Present only in `html_delta` chunks. Concatenate the fragments in order to rebuild the full page.",
      "properties": {
        "delta": {
          "type": "string",
          "description": "The next fragment of the HTML page."
        }
      }
    },
    "meta": {
      "$ref": "#/$defs/DeepResearchMeta"
    }
  },
  "$defs": {
    "DeepResearchAnalysis": {
      "type": "object",
      "description": "Analysis output for one research round. Carried by `analysis` chunks.",
      "properties": {
        "findings": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Key findings extracted from this round."
        },
        "should_continue": {
          "type": "boolean",
          "description": "Whether the pipeline should run another research round."
        },
        "follow_up_suggestions": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Suggested research directions for the next round."
        }
      }
    },
    "DeepResearchAngle": {
      "type": "object",
      "description": "A single research angle within the plan.",
      "properties": {
        "focus": {
          "type": "string",
          "description": "Angle name."
        },
        "focus_desc": {
          "type": "string",
          "description": "Angle description."
        },
        "interpretation_id": {
          "type": "string",
          "description": "The meaning ID this angle serves. `\"general\"` denotes a cross-interpretation angle."
        },
        "queries": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Search queries planned for this angle."
        },
        "sub_question_ids": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Sub-question IDs covered by this angle."
        }
      }
    },
    "DeepResearchBrief": {
      "type": "object",
      "description": "Report outline and evidence set. Carried by `brief` chunks.",
      "properties": {
        "report_type": {
          "type": "string",
          "enum": [
            "general",
            "comparison",
            "trend",
            "how-to",
            "evaluation",
            "framework",
            "deep_explainer",
            "theoretical_analysis",
            "landscape_mapping",
            "multi_part"
          ],
          "description": "Report type, classified by the LLM from the question. `general`: general synthesis; `comparison`: cross-entity comparison; `trend`: time-axis trend analysis; `how-to`: step-by-step guide; `evaluation`: ranked or scored evaluation; `framework`: methodology or scoring framework; `deep_explainer`: deep explanation of a single topic; `theoretical_analysis`: scholarly analysis across multiple theoretical lenses; `landscape_mapping`: taxonomy and players in a domain; `multi_part`: composite question with explicit sub-questions."
        },
        "secondary_report_types": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Secondary type tags for hybrid reports, combined with `report_type`."
        },
        "total_word_budget": {
          "type": "integer",
          "description": "Total word budget for the report."
        },
        "assertiveness_required": {
          "type": "boolean",
          "description": "Whether the report must deliver a clear verdict."
        },
        "verdict_scaffold": {
          "$ref": "#/$defs/DeepResearchVerdictScaffold"
        },
        "tables": {
          "type": "array",
          "description": "Table metadata to render in the report. Mutually exclusive with `presentation_notes`.",
          "items": {
            "$ref": "#/$defs/DeepResearchTable"
          }
        },
        "presentation_notes": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Presentation notes for reports that do not use tables. Mutually exclusive with `tables`."
        },
        "outline": {
          "type": "array",
          "description": "Report outline in section order.",
          "items": {
            "$ref": "#/$defs/DeepResearchOutlineSection"
          }
        },
        "sub_question_to_section_map": {
          "type": "object",
          "additionalProperties": {
            "type": "string"
          },
          "description": "Mapping from sub-question ID to section ID."
        },
        "unresolved": {
          "$ref": "#/$defs/DeepResearchUnresolved"
        },
        "suggested_title": {
          "type": "string",
          "description": "Suggested title for the report."
        },
        "references": {
          "type": "array",
          "description": "List of cited references.",
          "items": {
            "$ref": "#/$defs/DeepResearchReference"
          }
        }
      }
    },
    "DeepResearchChunkChoice": {
      "type": "object",
      "description": "A single choice in a Deep Research streaming chunk. Carried by `content` and `finish` chunks.",
      "properties": {
        "index": {
          "type": "number",
          "description": "The index of this choice. Usually `0`."
        },
        "delta": {
          "$ref": "#/$defs/DeepResearchChunkDelta"
        },
        "finish_reason": {
          "type": [
            "string",
            "null"
          ],
          "enum": [
            "stop",
            "length",
            "content_filter",
            "error"
          ],
          "description": "The reason generation stopped. `null` in `content` chunks; populated in the `finish` chunk."
        }
      }
    },
    "DeepResearchChunkDelta": {
      "type": "object",
      "description": "Incremental content in a Deep Research streaming chunk.",
      "properties": {
        "content": {
          "type": "string",
          "description": "Incremental report text. Concatenate across `content` chunks to build the final report."
        }
      }
    },
    "DeepResearchEvidence": {
      "type": "object",
      "description": "A single piece of evidence within a section.",
      "properties": {
        "content": {
          "type": "string",
          "description": "Evidence content."
        },
        "source_indices": {
          "type": "array",
          "items": {
            "type": "integer"
          },
          "description": "Source indices cited by this evidence (matching `brief.references[].index`)."
        },
        "confidence": {
          "type": "string",
          "enum": [
            "strong",
            "moderate",
            "weak",
            "conflicting"
          ],
          "description": "Confidence level of the evidence."
        },
        "layer": {
          "type": "string",
          "enum": [
            "phenomenon",
            "mechanism",
            "evidence",
            "implication"
          ],
          "description": "Depth layer of the evidence."
        }
      }
    },
    "DeepResearchInterpretation": {
      "type": "object",
      "description": "An ambiguous term and its candidate meanings.",
      "properties": {
        "term": {
          "type": "string",
          "description": "The ambiguous term."
        },
        "meanings": {
          "type": "array",
          "description": "All candidate meanings for this term.",
          "items": {
            "$ref": "#/$defs/DeepResearchMeaning"
          }
        },
        "chosen": {
          "type": "string",
          "description": "The meaning ID the LLM picked by default."
        },
        "reasoning": {
          "type": "string",
          "description": "The LLM's rationale for the chosen meaning."
        }
      }
    },
    "DeepResearchMeaning": {
      "type": "object",
      "description": "A candidate meaning for an ambiguous term.",
      "properties": {
        "id": {
          "type": "string",
          "description": "Unique meaning ID."
        },
        "label": {
          "type": "string",
          "description": "Description of the meaning."
        }
      }
    },
    "DeepResearchMeta": {
      "type": "object",
      "description": "Usage and latency metadata for the Deep Research call. Carried by `usage` chunks.",
      "properties": {
        "usage": {
          "type": "object",
          "description": "Search usage.",
          "properties": {
            "num_search_queries": {
              "type": "integer",
              "description": "Total number of search queries executed across all rounds."
            }
          }
        },
        "latency": {
          "type": "integer",
          "description": "Total request latency in milliseconds."
        },
        "total_rounds": {
          "type": "integer",
          "description": "Total number of research rounds completed."
        },
        "total_search_count": {
          "type": "integer",
          "description": "Total search results accumulated across all rounds."
        },
        "billed_tier": {
          "type": "string",
          "description": "The tier actually billed for this request."
        }
      }
    },
    "DeepResearchOutlineSection": {
      "type": "object",
      "description": "A single section in the report outline.",
      "properties": {
        "section_id": {
          "type": "string",
          "description": "Unique section ID, referenced by `sub_question_to_section_map` and `table.placement`."
        },
        "section_title": {
          "type": "string",
          "description": "Section title."
        },
        "thesis": {
          "type": "string",
          "description": "Central claim of this section."
        },
        "table_ids": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Table IDs belonging to this section."
        },
        "covers_sub_questions": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Sub-question IDs covered by this section."
        },
        "target_words": {
          "type": "integer",
          "description": "Target word count for this section."
        },
        "evidence": {
          "type": "array",
          "description": "Evidence supporting this section.",
          "items": {
            "$ref": "#/$defs/DeepResearchEvidence"
          }
        }
      }
    },
    "DeepResearchPlan": {
      "type": "object",
      "description": "Research plan generated in Phase 1. Carried by `plan` chunks.",
      "properties": {
        "title": {
          "type": "string",
          "description": "Plan title."
        },
        "overview": {
          "type": "string",
          "description": "Plan overview."
        },
        "interpretations": {
          "type": "array",
          "description": "Ambiguous terms in the question along with their possible meanings. Empty when the question has no ambiguity.",
          "items": {
            "$ref": "#/$defs/DeepResearchInterpretation"
          }
        },
        "angles": {
          "type": "array",
          "description": "Research angles the plan will explore.",
          "items": {
            "$ref": "#/$defs/DeepResearchAngle"
          }
        },
        "requires_selection": {
          "type": "boolean",
          "description": "When `true`, the SSE stream ends at this `plan` chunk and waits for the client to continue via Phase 2 (`plan_id` + `selections`). When `false`, research continues automatically."
        }
      }
    },
    "DeepResearchReference": {
      "type": "object",
      "description": "A single cited reference.",
      "properties": {
        "index": {
          "type": "integer",
          "description": "Reference index; cited in the report body as `[^N]`."
        },
        "url": {
          "type": "string",
          "description": "Source URL."
        },
        "title": {
          "type": "string",
          "description": "Source title."
        }
      }
    },
    "DeepResearchTable": {
      "type": "object",
      "description": "Table metadata referenced from an outline section.",
      "properties": {
        "table_id": {
          "type": "string",
          "description": "Unique table ID, referenced by `outline.table_ids`."
        },
        "title": {
          "type": "string",
          "description": "Table title."
        },
        "columns": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Column names."
        },
        "description": {
          "type": "string",
          "description": "Description of the table contents, guiding how the report-writing stage should populate the cells."
        },
        "placement": {
          "type": "string",
          "description": "Section ID this table belongs to."
        }
      }
    },
    "DeepResearchUnresolved": {
      "type": "object",
      "description": "Items the brief stage flagged as unresolved.",
      "properties": {
        "contradictions": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Contradictions between sources."
        },
        "weak_claims": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Claims with thin evidence."
        },
        "depth_gaps": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Depth-layer gaps across sections."
        },
        "unanswered": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Sub-questions left unanswered."
        }
      }
    },
    "DeepResearchVerdictScaffold": {
      "type": "object",
      "description": "Structured scaffold for reports that need to deliver a verdict.",
      "properties": {
        "verdict_type": {
          "type": "string",
          "enum": [
            "ranked_list",
            "single_pick",
            "tiered_recommendation",
            "qualified_pick"
          ],
          "description": "Shape of the verdict. `ranked_list`: ordered ranking; `single_pick`: a single best answer; `tiered_recommendation`: tiered recommendation; `qualified_pick`: conditional recommendation."
        },
        "items_expected": {
          "type": "integer",
          "description": "Expected number of items in the verdict."
        },
        "justification_dimensions": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Data dimensions supporting the verdict."
        }
      }
    },
    "DeepResearchVisual": {
      "type": "object",
      "description": "Visual material for one report section. Carried by `visual` chunks on the `pro-visual` tier.",
      "properties": {
        "section_id": {
          "type": "string",
          "description": "The report section this material belongs to, matching `brief.outline[].section_id`."
        },
        "images": {
          "type": "array",
          "description": "Images selected for this section.",
          "items": {
            "$ref": "#/$defs/DeepResearchVisualImage"
          }
        },
        "videos": {
          "type": "array",
          "description": "Videos selected for this section.",
          "items": {
            "$ref": "#/$defs/DeepResearchVisualVideo"
          }
        }
      }
    },
    "DeepResearchVisualImage": {
      "type": "object",
      "description": "An image selected for a report section.",
      "properties": {
        "url": {
          "type": "string",
          "description": "The image URL."
        },
        "thumbnail": {
          "type": "string",
          "description": "Thumbnail URL."
        },
        "caption": {
          "type": "string",
          "description": "A short caption for the image."
        },
        "visual_evidence": {
          "type": "string",
          "description": "Why this image supports the section's content."
        },
        "source_page": {
          "type": "string",
          "description": "URL of the page the image was found on."
        },
        "width": {
          "type": "integer",
          "description": "Image width in pixels."
        },
        "height": {
          "type": "integer",
          "description": "Image height in pixels."
        },
        "confidence": {
          "type": "number",
          "description": "Relevance confidence score."
        }
      }
    },
    "DeepResearchVisualVideo": {
      "type": "object",
      "description": "A video selected for a report section.",
      "properties": {
        "url": {
          "type": "string",
          "description": "The video URL."
        },
        "cover_url": {
          "type": "string",
          "description": "Video cover image URL."
        },
        "title": {
          "type": "string",
          "description": "The video title."
        },
        "duration_seconds": {
          "type": "integer",
          "description": "Video duration in seconds."
        },
        "source_page": {
          "type": "string",
          "description": "URL of the page the video was found on."
        },
        "time_published": {
          "type": "string",
          "description": "Publish time in ISO 8601."
        }
      }
    },
    "SearchResult": {
      "type": "object",
      "description": "A single search result.",
      "properties": {
        "title": {
          "type": "string",
          "description": "The title of the result page."
        },
        "url": {
          "type": "string",
          "description": "The URL of the result page."
        },
        "highlight": {
          "type": "string",
          "description": "Query-relevant highlight snippets. Returned only if highlight.enable is true."
        },
        "full_content": {
          "type": "string",
          "description": "Full raw page content. Returned only if full_content.enable is true."
        },
        "authors": {
          "type": "string",
          "description": "Website name or author."
        },
        "time_published": {
          "type": "string",
          "format": "date-time",
          "description": "Publish time in ISO 8601."
        },
        "time_last_crawled": {
          "type": "string",
          "format": "date-time",
          "description": "Last crawl time in ISO 8601."
        },
        "favicon": {
          "type": "string",
          "description": "The favicon URL of the result site."
        },
        "cover_image": {
          "type": "object",
          "description": "The page cover image. Returned only when `include_images` is true and the page has a cover image.",
          "properties": {
            "url": {
              "type": "string",
              "description": "The cover image URL."
            },
            "description": {
              "type": "string",
              "description": "Text description of the cover image."
            }
          }
        },
        "images": {
          "type": "array",
          "description": "In-body images of the page, in order of appearance. Returned only when `include_images` is true.",
          "items": {
            "type": "object",
            "properties": {
              "url": {
                "type": "string",
                "description": "The image URL."
              },
              "description": {
                "type": "string",
                "description": "Text description of the image."
              }
            }
          }
        }
      }
    },
    "SearchResultGroup": {
      "type": "object",
      "description": "A group of search results for a single sub-query.",
      "properties": {
        "query": {
          "type": "string",
          "description": "The sub-query that produced these results."
        },
        "results": {
          "type": "array",
          "description": "The search results for this sub-query.",
          "items": {
            "$ref": "#/$defs/SearchResult"
          }
        },
        "latency": {
          "type": "integer",
          "description": "Search latency for this query in milliseconds."
        }
      }
    }
  }
}