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# Explain a run using retained trace evidence

POST https://api.runtype.com/v1/logs/trace/execution/{executionId}/explain

Runs a bounded, tool-free analysis in the caller account. Model usage is metered. Requires ANALYTICS:READ and FLOWS:EXECUTE for API keys. Does not assess business quality or modify the source run.

Reference: https://docs.runtype.com/api-reference/runtype-api/logs/explain-a-run-using-retained-trace-evidence

## Authentication

- `Authorization` header (bearer token, required) — API key or Clerk session token

## Servers

- `https://api.runtype.com` (Production, default)
- `https://api.runtype-staging.com` (Staging)

## Request

### Path parameters

- `executionId` (string, required)

## Response

### 200

Evidence-linked run explanation

- `data` (V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaData, required)
- `success` (boolean, required)

## Errors

### 400 Bad Request Error

Invalid execution ID

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 401 Unauthorized Error

Unauthorized

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 402 Payment Required Error

Execution spend limit reached

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 403 Forbidden Error

Required permission or account verification missing

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 404 Not Found Error

No retained trace evidence

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 408 Request Timeout Error

Request cancelled

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 429 Too Many Requests Error

Execution rate limit reached

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 502 Bad Gateway Error

Analysis failed or invalid evidence citations

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

### 503 Service Unavailable Error

Trace service unavailable

- `error` (string, required)
- `details` (list of ErrorDetailsItems, optional)

## Types

### V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaData

- `analysis` (V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysis, required)
- `analysisExecutionId` (string, required)
- `analyzerVersion` (integer, required)
- `coverageWarnings` (list of string, required)
- `evidenceCount` (integer, required)
- `executionId` (string, required)
- `generatedAt` (string, required)
- `qualityAssessment` (enum, required)
  - Allowed values: `not_assessed`

### ErrorDetailsItems

- `message` (string, required)
- `code` (string, optional) — Stable Runtype validation code (e.g. MISSING_REQUIRED_FIELD, INVALID_ENUM).
- `path` (string, optional) — Dotted JSON path to the offending field.
- `suggestion` (string, optional) — Actionable hint (allowed values, accepted range, …).

### V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysis

- `hypotheses` (list of V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisHypothesesItems, required)
- `limitations` (list of string, required)
- `nextSteps` (list of V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisNextStepsItems, required)
- `observations` (list of V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisObservationsItems, required)
- `overview` (V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisOverview, required)

### V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisHypothesesItems

- `eventIds` (list of string, required)
- `text` (string, required)

### V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisNextStepsItems

- `eventIds` (list of string, required)
- `text` (string, required)

### V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisObservationsItems

- `eventIds` (list of string, required)
- `text` (string, required)

### V1LogsTraceExecutionExecutionIdExplainPostResponsesContentApplicationJsonSchemaDataAnalysisOverview

- `eventIds` (list of string, required)
- `text` (string, required)

## Examples

**Response**

```json
{
  "data": {
    "analysis": {
      "hypotheses": [
        {
          "eventIds": [
            "string"
          ],
          "text": "string"
        }
      ],
      "limitations": [
        "string"
      ],
      "nextSteps": [
        {
          "eventIds": [
            "string"
          ],
          "text": "string"
        }
      ],
      "observations": [
        {
          "eventIds": [
            "string"
          ],
          "text": "string"
        }
      ],
      "overview": {
        "eventIds": [
          "string"
        ],
        "text": "string"
      }
    },
    "analysisExecutionId": "string",
    "analyzerVersion": 1,
    "coverageWarnings": [
      "string"
    ],
    "evidenceCount": 1,
    "executionId": "string",
    "generatedAt": "string",
    "qualityAssessment": "not_assessed"
  },
  "success": true
}
```

**SDK Code**

```python
import requests

url = "https://api.runtype.com/v1/logs/trace/execution/executionId/explain"

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

response = requests.post(url, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.runtype.com/v1/logs/trace/execution/executionId/explain';
const options = {method: 'POST', 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.runtype.com/v1/logs/trace/execution/executionId/explain"

	req, _ := http.NewRequest("POST", 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.runtype.com/v1/logs/trace/execution/executionId/explain")

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

request = Net::HTTP::Post.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.post("https://api.runtype.com/v1/logs/trace/execution/executionId/explain")
  .header("Authorization", "Bearer <token>")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.runtype.com/v1/logs/trace/execution/executionId/explain', [
  'headers' => [
    'Authorization' => 'Bearer <token>',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://api.runtype.com/v1/logs/trace/execution/executionId/explain");
var request = new RestRequest(Method.POST);
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.runtype.com/v1/logs/trace/execution/executionId/explain")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
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()
```