---
title: "Turn emulator events into checkpoints, rewinds, notes, and a timeline."
method: POST
path: "/api/replay"
---

# Turn emulator events into checkpoints, rewinds, notes, and a timeline.

`POST /api/replay`

## Request

- Base URL: `https://whetstone.cyberelf.link`
- URL: `https://whetstone.cyberelf.link/api/replay`
- Auth: none declared

## Request body

- object: Reconstruct checkpoints, rewinds, branches, and verifier outcomes from control events.
  - `events` object[], required: Ordered reasoning-emulator events.
    - `detail` string, required
    - `kind` string, required: Event class such as control, verifier, model, or observation.
    - `source` string
    - `step` integer
  - `notes` string[]: Optional analyst notes.

## Response `200`

Deterministic receipt with item-level decision path and SHA-256 hashes.

## Other responses

- `400`: Input error (a hint points at /api/examples).
- `429`: Rate limited.

---

[API](https://skmtc.dev/cyberelf/apis/whetstone-tools.md) · [All operations](https://skmtc.dev/cyberelf/apis/whetstone-tools/llms.txt) · [OpenAPI document](https://skmtc.dev/cyberelf/apis/whetstone-tools/revisions/4c656180ee4d?raw)