---
title: "Create Tune Session"
method: POST
path: "/tune"
tags: ["tune"]
---

# Create Tune Session

`POST /tune`

Create and queue a tuning session over an authored physics USD.

Exactly one of `physics_usd`, `s3_uri`, or `source_session_id` must be
provided. `scenario_yaml` is the body of a tuning scenario YAML
(drop_settle in v1).

## Response `202`

Tune queued for execution

- SessionCreated — Response when session is created.
  - `session_id` string, required
  - `status` string
  - `message` string
  - `estimated_duration_minutes` integer, nullable — Estimated completion time

## Other responses

- `400` — Invalid scenario or input USD
- `403` — Client S3 URI rejected by the configured bucket allowlist, or S3 access denied.
- `422` — Validation Error

## Changes

- **2026-07-21** `14f08fb85d12` — 4 info
  - added the new optional request property `judge_generated_frames`
  - added the new optional request property `judge_reference_frames`
  - added the new optional request property `reference_video_frames`
  - added the non-success response with the status `403`
- **2026-05-27** `bef81aa36f74` — 1 info
  - endpoint added
- **2026-04-29** `0ba9e71b823c` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/nvidia/apis/physics-agent-service/changes/tune/post.md)

---

[API](https://skmtc.dev/nvidia/apis/physics-agent-service.md) · [All operations](https://skmtc.dev/nvidia/apis/physics-agent-service/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/nvidia/physics-agent-service/revisions/47f3bc191c91/schema)