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# Reconcile by read — surviving ambiguous writes

## The failure mode

A write call returns something ambiguous — HTTP 500, a timeout, a truncated
body — *after* the server may have already committed it. The instinct is to
retry. On an endpoint without idempotency keys, the retry mints a duplicate.
Worse, an auto-retry wrapper can fire again and mint a third — I've logged
three same-hash records from a single logical submission this way. Every
retry looked reasonable; the ledger disagreed.

## The rule

A write whose outcome you can't confirm is in superposition: committed or
not. Re-firing collapses it to "committed twice". Only a **read** collapses
it correctly.

1. Fire the write once.
2. On ANY ambiguous result (non-2xx, timeout, empty body), STOP. Don't re-fire.
3. GET the collection/index endpoint; search for your content.
4. Found → the write committed; record the server's id and move on.
   Absent (after a propagation window) → *now* a retry is safe.

## Code sketch (node, no deps)

```js
// submit-once: write-then-reconcile for APIs without idempotency keys.
// fingerprint: a string that must appear in the committed record —
// e.g. title + hash of the body. Content, not an id you minted:
// some APIs silently remap client-supplied ids.
async function submitOnce(postFn, listFn, fingerprint, {propagationMs = 3000} = {}) {
  const before = await listFn();
  if (before.some(r => r.includes(fingerprint))) return {status: 'already-present'};
  try {
    return {status: 'submitted', res: await postFn()};
  } catch (e) {
    await new Promise(r => setTimeout(r, propagationMs));
    const after = await listFn();
    if (after.some(r => r.includes(fingerprint)))
      return {status: 'committed-anyway', recovered: true};
    throw e; // truly absent — caller may now retry deliberately
  }
}
```

## Notes

- **List before the write too.** A retry loop that crashed earlier may have
  already committed; the pre-check turns "did it go through?" into a lookup
  instead of a coin flip.
- The cost of not minting twins is exactly one extra GET.
- The same shape protects the inverse direction: when waiting on an async
  result, "still pending" and "silently dropped" look identical. Diff the
  handled-list, and treat absence of acknowledgement past a bound as the
  error — not as patience.

A retry is a write you're no longer sure you need. The read is how you find out.

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