# JSON Output

This document is the durable JSON output file-format contract produced by the
implemented `json` output module and written by the CLI.

## Output Directory

The CLI writes logical output files under:

```text
<output-root>/<run-id>/
```

The default output root is `./notarius-output`. Operational behavior is covered
in [Operations](../operations.md).

## Files

The `json` output module writes:

- `index.json`
- `manifest.json`
- `artifacts/<artifact-type>.json`, one file per approved artifact type
- `rejected.json`
- `warnings.json`

Files are pretty-printed JSON with a trailing newline.

## `index.json`

Shape:

```json
{
  "manifest_file": "manifest.json",
  "artifact_files": [
    {
      "artifact_type": "dnd.spell_cast",
      "file": "artifacts/dnd.spell_cast.json"
    }
  ],
  "rejected_file": "rejected.json",
  "warnings_file": "warnings.json"
}
```

`artifact_files` is sorted by artifact type. It is empty when no artifacts are
approved.

## `manifest.json`

`manifest.json` contains a run manifest:

```json
{
  "run_id": "run-123",
  "pipeline_id": "dnd-session",
  "pipeline_digest": "sha256:...",
  "input_module": "seriatim",
  "chunker": "generic",
  "module_metadata": {
    "chunker": {
      "prompt_id": "dnd.scenes",
      "prompt_version": "v1",
      "prompt_sha256": "sha256:...",
      "response_schema_key": "dnd_scenes",
      "response_schema_id": "schema-dnd-scenes",
      "response_schema_name": "dnd_scenes",
      "response_schema_version": "v1",
      "response_schema_sha256": "sha256:..."
    }
  },
  "source_digests": ["sha256:..."],
  "extractors": ["dnd/spells"],
  "merger": "appendorder",
  "normalizer": "noop",
  "output_encoder": "json",
  "artifact_lanes": [
    {
      "id": "spells",
      "extractor": "dnd/spells",
      "merger": "appendorder",
      "normalizer": "noop"
    }
  ],
  "llm_profiles": [
    {
      "id": "default",
      "provider": "openai-compatible",
      "model": "configured-model"
    }
  ],
  "validation_status": "approved",
  "started_at": "2026-01-01T00:00:00Z",
  "completed_at": "2026-01-01T00:00:01Z"
}
```

Fields with empty values may be omitted by JSON encoding.

`validation_status` is `approved` when no candidates were rejected and
`rejected` when one or more candidates were rejected.

Top-level `module_metadata` is reserved for singleton pipeline modules
(`input`, `chunker`, and `output`). Lane-owned module metadata remains under
`artifact_lanes[].metadata`.

## Artifact Files

Each artifact file has this shape:

```json
{
  "artifact_type": "dnd.spell_cast",
  "artifacts": [
    {
      "extractor_key": "dnd/spells",
      "artifact_type": "dnd.spell_cast",
      "schema_version": "v1",
      "payload": {},
      "source_refs": [
        {
          "source_id": "session-alpha",
          "start_unit_id": "seg-001",
          "end_unit_id": "seg-001"
        }
      ]
    }
  ]
}
```

Artifact envelope fields:

- `extractor_key`: extractor module key.
- `artifact_type`: artifact type.
- `schema_version`: artifact schema version.
- `payload`: artifact-type-specific JSON payload.
- `source_refs`: optional generic source references.
- `metadata`: optional artifact metadata.

Artifact file names are produced by sanitizing the artifact type:

- characters outside `A-Z`, `a-z`, `0-9`, `.`, `_`, and `-` become `_`;
- repeated `..` sequences are replaced;
- leading and trailing `.`, `_`, and `-` are trimmed;
- empty sanitized names are rejected.

For current D&D spell-cast artifacts, the file is
`artifacts/dnd.spell_cast.json`.

## `rejected.json`

Shape:

```json
{
  "rejected": [
    {
      "candidate": {
        "index": 0,
        "extractor_key": "dnd/spells",
        "artifact_type": "dnd.spell_cast",
        "schema_version": "v1",
        "payload": {},
        "source_refs": []
      },
      "validator_name": "dnd/spells/source_refs",
      "reason_code": "missing_source_ref",
      "message": "spell cast candidate must include at least one source ref"
    }
  ]
}
```

`rejected` is an empty array when no candidates are rejected.

## `warnings.json`

Shape:

```json
{
  "warnings": [
    {
      "scope": "output",
      "reason_code": "example_warning",
      "message": "warning message"
    }
  ]
}
```

`warnings` is an empty array when no warnings are reported.

## Path Safety

The output module returns slash-separated logical paths. The CLI also validates
logical output names before writing:

- names must be non-empty;
- names must be relative;
- names must be clean;
- names must use `/`, not `\`;
- names must not contain `..`;
- resolved paths must stay under the run output directory.

Durable writes are atomic per file.