---
name: tht-evidence-authoring
description: Restructure exactly one normalized Thoth Source Evidence request into strict, typed Evidence candidate JSON for deterministic host-side review.
---

# Evidence authoring response contract

You receive exactly one normalized Source Evidence request. Return one JSON object with
only a `candidates` array, without Markdown fences, comments, or explanatory text. The
host strictly rejects unknown or missing fields.

Candidate JSON uses response protocol version 1. The host renders accepted candidates
as editable Curated Evidence v4; supply the typed payload and exact excerpts in this
response, leaving file rendering and provenance metadata to the host.

Use only facts present in `normalized_text`. Never merge, cite, or infer facts from
another source. Reuse an `existing_id` only when it was supplied in `previous_units`;
otherwise omit it. Preserve prior reviewed wording when it is still supported. When a
prior unit is no longer supported, omit its `existing_id` and add a
`source_no_longer_supports_unit` review item to the related candidate when applicable.

Each candidate has exactly this shape:

```json
{
  "schema_version": 1,
  "existing_id": "evidence:optional-existing-id",
  "title": "Short human title",
  "kind": "glossary",
  "purposes": ["disambiguation"],
  "applies_to": {
    "concepts": ["concept"],
    "tables": ["schema.table"],
    "columns": ["schema.table.column"]
  },
  "language": "it",
  "supporting_excerpts": ["One short exact excerpt copied from normalized_text."],
  "review_items": [
    {"code": "specific_ambiguity", "message": "What a human must decide.", "field": "payload"}
  ],
  "payload": {"definition": "Typed payload described below.", "synonyms": [], "variants": []}
}
```

Omit `existing_id` for new candidates. `applies_to` must contain only `concepts`,
`tables`, and `columns`; use empty arrays when the source does not establish a value.
Every table identifier must be `schema.table`, and every column identifier must be
`schema.table.column`. Include a table or column identifier only when that fully
qualified literal already appears in `normalized_text`. Never qualify an unqualified
name yourself. If the source contains only names such as `fact_ilr` or `cod_paz`, leave
the corresponding `tables` or `columns` array empty, keep the names in prose, and add a
review item when qualification matters. `review_items` may be empty. A review item
contains only `code`, `message`, and optional `field`.

Allowed `purposes` are `disambiguation`, `rewriting`, `schema_linking`, and
`sql_generation`. Allowed `kind` values and their exact `payload` shapes are:

- `glossary`: `{"definition": string, "synonyms": [string], "variants": [string]}`
- `domain`: `{"rule": string}`
- `enum`: `{"column": "schema.table.column", "values": {"stored value": "meaning"}}`
- `example`: `{"question": string, "interpretation": string}`
- `mapping`: `{"concept": string, "tables": ["schema.table"], "columns": ["schema.table.column"]}`
- `normalization`: `{"input": string, "output": string, "rule": string}`
- `formula`: `{"concept": string, "columns": ["schema.table.column"], "sql": "one PostgreSQL expression"}`
- `reference`: `{"url": "https://...", "label": string, "description": string}`

Return exactly one candidate: the source's primary independent, reviewable Evidence
Unit. Preserve the source's secondary facts in that unit's typed rule, definition, or
interpretation instead of emitting extra candidates; do not atomize individual
sentences. The candidate must
include one to five nonempty exact `supporting_excerpts`, each at most 1000 characters.
Copy each excerpt as one continuous, character-for-character substring of
`normalized_text`, including its original Markdown punctuation. Prefer copying one
complete source line. Never paraphrase, normalize whitespace, remove backticks, or
change quotation marks inside an excerpt.

Before returning JSON, check every excerpt with the equivalent of
`excerpt in normalized_text`; replace any excerpt that would fail with an exact complete
line from the source. Also check that there is exactly one candidate, every object
has only the declared fields, every kind has the exact payload shape above, and stdout
contains only the JSON object. Add a review item whenever the source leaves a material
ambiguity; never silently guess a table, column, enum meaning, formula, or URL.

Use the source path as a kind hint: `00-glossario` normally yields `glossary` or
`domain`; `10-domini-clinici` normally yields `domain`; `20-valori-enum` normally yields
`enum`; `30-esempi-nlq` normally yields `example`; `40-mapping-semantico` normally yields
`mapping` or `domain`; and `50-metadati-normalizzazione` normally yields
`normalization`. Depart from the hinted kind only when the source explicitly provides
the complete typed payload for another kind. Emit `formula` only when the source states
one complete PostgreSQL expression and all referenced columns are fully qualified. If
an `enum`, `mapping`, or `formula` payload would require an identifier that is not
already fully qualified in the source, emit a `domain` candidate instead and record the
missing qualification as a review item.

Do not assign a new canonical ID; the host does that deterministically. Do not use tools
or alter any repository state.