---
title: "Get the customer-readable trace for a simulation run"
method: GET
path: "/v1/simulation/runs/{sim_run_id}/trace"
tags: ["simulation_runs"]
---

# Get the customer-readable trace for a simulation run

`GET /v1/simulation/runs/{sim_run_id}/trace`

## Path parameters

- `sim_run_id` string, uuid, required

## Query parameters

- `turn_id` string, uuid, nullable
- `cursor` string, nullable
- `limit` integer
- `category` 'product' | 'engineering' | 'all'

## Response `200`

Successful Response

- SessionTraceResponse — Envelope returned by both trace read endpoints.
  - `steps` TraceStep[], required
    - `kind` string, required
    - `actor` 'Customer' | 'Agent' | 'System', required
    - `title` string, required
    - `summary` string, nullable
    - `status` 'Succeeded' | 'Failed' | 'Skipped' | 'In Progress', required
    - `started_at` string, date-time, required
    - `ended_at` string, date-time, nullable
    - `duration_ms` integer, nullable
    - `turn_id` string, nullable
    - `details` object
    - `observation_ids` string[]
    - `truncation` TraceTruncation[]
      - `path` string, required
      - `reason` string, nullable
      - `scope` string, nullable
      - `original_bytes` integer, nullable
      - `stored_bytes` integer, nullable
      - `original_chars` integer, nullable
      - `original_type` string, nullable
      - `original_leaves` integer, nullable
      - `stored_leaves` integer, nullable
      - `omitted_entries` integer, nullable
  - `next_cursor` string, nullable

## Other responses

- `400` — Bad request
- `401` — Authentication required
- `404` — Resource not found
- `422` — Validation Error

## Changes

- **2026-08-13** `9cd7291d4228` — 2 info
  - added the optional property `steps/items/observation_ids` to the response with the `200` status
  - added the optional property `steps/items/truncation` to the response with the `200` status
- **2026-08-12** `5a5597ebb2d6` — 6 info
  - added the optional property `retry_after` to the response with the `400` status
  - added the optional property `retry_after` to the response with the `401` status
  - added the optional property `retry_after` to the response with the `404` status
  - added the optional property `retryable` to the response with the `400` status
  - …2 more

[Change history](https://skmtc.dev/oneloop-hq/apis/feather-api/changes/v1/simulation/runs/:sim_run_id/trace/get.md)

---

[API](https://skmtc.dev/oneloop-hq/apis/feather-api.md) · [All operations](https://skmtc.dev/oneloop-hq/apis/feather-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/oneloop-hq/feather-api/revisions/9cd7291d4228/schema)