> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.loreos.app/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.loreos.app/_mcp/server.

# Session Trace

GET https://api.loreos.app/v1/sessions/{session_id}/trace

Unified per-event trace for one session (newest first): each event with its
latest push-delivery status and the turn's settled usage credits — so
inbound -> reply -> cost -> delivery is ONE read instead of stitching the events,
usage, and delivery logs by hand. App-scoped (404 if the session isn't this app's).

Reference: https://docs.loreos.app/api-reference/observability/session-trace

## Authentication

- `Authorization` header (bearer token, required) — LoreOS runtime API key (`ck_...`), sent as `Authorization: Bearer <key>`.

## Servers

- `https://api.loreos.app` (Production, default)
- `http://127.0.0.1:8000` (Local development)

## Request

### Path parameters

- `session_id` (string, required)

### Query parameters

- `limit` (integer, optional, default: 100)

## Response

### 200

Successful Response

- `schema_version` ("v0", required) — LoreOS success-envelope version.
- `data` (SessionTraceData, required)
- `next_actions` (list of V1NextAction, required) — Concrete follow-up API actions; empty when no action is required.

## Errors

### 401 Unauthorized Error

Runtime API key is missing, invalid, expired, or revoked.

- `detail` (V1ErrorDetail, required) — Stable public error core; domain-specific fields may be added alongside it.

### 404 Not Found Error

Session not found in the caller's app.

- `detail` (V1ErrorDetail, required) — Stable public error core; domain-specific fields may be added alongside it.

### 422 Unprocessable Entity Error

Bounded trace limit validation failed.

- `detail` (V1ErrorDetail, required) — Stable public error core; domain-specific fields may be added alongside it.

## Types

### SessionTraceData

- `session_id` (string, required)
- `trace` (list of SessionTraceEvent, required)

### V1NextAction

- `command` (string, required) — The next API command an agent can execute.
- `description` (string, required) — Why or when to execute the command.

### V1ErrorDetail

Stable public error core; domain-specific fields may be added alongside it.

- `code` (string, required)
- `message` (string, required)
- `fix` (string, required)

### SessionTraceEvent

- `seq` (integer, required)
- `event_id` (string, required)
- `run_ref` (string, required, nullable) — Opaque per-run correlator; may be a UUID or a `trace_<hex>` identifier.
- `type` (string, required)
- `role` (string, required, nullable)
- `created_at` (datetime, required, nullable)
- `text` (string, required, nullable)
- `image_url` (string, required, nullable)
- `delivery_status` (string, required, nullable)
- `delivery_attempts` (integer, required, nullable)
- `delivery_error` (string, required, nullable)
- `usage_credits` (double, required)

## Examples

**Response**

```json
{
  "schema_version": "v0",
  "data": {
    "session_id": "00000000-0000-0000-0000-000000000000",
    "trace": [
      {
        "seq": 4,
        "event_id": "77777777-7777-7777-7777-777777777777",
        "run_ref": "trace_0000000000000000",
        "type": "message.created",
        "role": "character",
        "created_at": "2026-06-19T09:04:10Z",
        "text": "It works.",
        "image_url": null,
        "delivery_status": null,
        "delivery_attempts": null,
        "delivery_error": null,
        "usage_credits": 0.0034
      }
    ]
  },
  "next_actions": []
}
```

**SDK Code**

```python
import requests

url = "https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace"

querystring = {"limit":"100"}

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers, params=querystring)

print(response.json())
```

```javascript
const url = 'https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace?limit=100';
const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace?limit=100"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace?limit=100")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace?limit=100")
  .header("Authorization", "Bearer <token>")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace?limit=100', [
  'headers' => [
    'Authorization' => 'Bearer <token>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace?limit=100");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <token>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Authorization": "Bearer <token>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.loreos.app/v1/sessions/00000000-0000-0000-0000-000000000000/trace?limit=100")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```