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Core concept · measured evidence

# Measurement evidence

Postdom preserves platform values, observation time, availability state, and evidence limits without converting missing data into zero.

Evidence distinction

## Value semantics

 NUMERIC ZERO  **0**

### Measured nothing

A platform supplied numeric evidence whose value is zero. Keep the zero.

 NULL VALUE  **—**

### No supported value

No evidence-backed numeric value was returned. Preserve null and inspect availability.

Modeled evidence

## Availability states

Every modeled field has one availability state. A reason is guaranteed only for `never` and `unverified`.

 Expected value

`available`

The platform is expected to expose the field. A null may still have no reason.

 Expected later

`delayed(2-3d)`

The platform may expose the field after the stated delay.

 Derivable evidence

`estimable`

Evidence could support a derived value. Postdom does not promise that computation exists.

 Platform absence

`never`

The platform does not expose the field. Null includes an explicit reason.

 Evidence pending

`unverified`

Availability lacks verification. Null includes an explicit reason.

Labeled example

## Example snapshot

This excerpt shows a real zero beside an unverified null. The post ID, timestamp, and values are synthetic.

_EXAMPLE READ · CONFIGURED TOOL SCHEMA_

```
get_performance({
  post_id: "post_example_08"
})

// Example response excerpt
{
  "post_id": "post_example_08",
  "performance": [{
    "platform": "tiktok",
    "captured_at": "2026-09-01T10:00:00Z",
    "views": 0,
    "saves": null,
    "availability": {
      "views": {
        "state": "available",
        "reason": null
      },
      "saves": {
        "state": "unverified",
        "reason": "tiktok.saves is unverified; no evidence-backed value is available yet."
      }
    }
  }]
}
```

Agent response

## Measurement handoff

`available`

### Preserve evidence

Return the supplied number and observation time. Preserve a null when no value arrives.

`delayed(2-3d)`

### Retry later

Keep null distinct from zero, then retry after the evidence window.

`estimable`

### Avoid invention

Do not calculate a value unless a supported computation and required evidence exist.

`never · unverified`

### Explain absence

Return null with the supplied availability state and reason.

### Publish eligibility

A post that failed before any measurable destination publish is ineligible for performance. Return `publish_failed` instead of inventing a snapshot.

 VERIFIED · 26 AUGUST 2026  **Normalization rules · Modeled availability baseline**

The baseline covers nine fields across nine destinations. It does not guarantee a value for every non-never field.