# Activate a pairing session

**POST** `/v1/private/pairing/sessions/{sessionId}/activate`

Verify the activation HMAC and flip the runner row to CONNECTED

Base URL: `https://www.comet.com/opik/api`

Tags: `Pairing`

## Authorization

This operation requires no authorization.

## Path parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `sessionId` | `string` (uuid) | Yes | — |

## Request body

Optional. Media type: `application/json`

### Example request body

```json
{
  "hmac": "string",
  "runner_name": "string"
}
```

## Responses

| Status | Description | Media type |
| --- | --- | --- |
| `201` | Session activated | — |
| `403` | Invalid HMAC | `application/json` |
| `404` | Session not found | `application/json` |
| `409` | Session already activated | `application/json` |
| `422` | Unprocessable entity | `application/json` |
| `429` | Too many requests | `application/json` |

### Example response: 403 — Invalid HMAC

```json
{
  "code": 0,
  "details": "string",
  "message": "string"
}
```

### Example response: 404 — Session not found

```json
{
  "code": 0,
  "details": "string",
  "message": "string"
}
```

### Example response: 409 — Session already activated

```json
{
  "code": 0,
  "details": "string",
  "message": "string"
}
```

### Example response: 422 — Unprocessable entity

```json
{
  "code": 0,
  "details": "string",
  "message": "string"
}
```

### Example response: 429 — Too many requests

```json
{
  "code": 0,
  "details": "string",
  "message": "string"
}
```

## Related pages

- [Add blueprint to existing config](./updateagentconfig.md)
- [Add items to annotation queue](./additemstoannotationqueue.md)
- [Add span comment](./addspancomment.md)
- [Add span feedback score](./addspanfeedbackscore.md)
- [Add thread comment](./addthreadcomment.md)
- [Add trace comment](./addtracecomment.md)
- [Add trace feedback score](./addtracefeedbackscore.md)
- [Agent Configs](./tags/agent-configs.md)
- [Agent Insights](./tags/agent-insights.md)
- [Agent Insights Jobs](./tags/agent-insights-jobs.md)

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