> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs-beta.getzep.com/v4/sdk-reference/thread/lookup/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs-beta.getzep.com/_mcp/server.

# Lookup thread by developer id

POST https://api.getzep.com/api/v4/threads/lookup
Content-Type: application/json

Reference: https://docs-beta.getzep.com/sdk-reference/thread/lookup

## Authentication

- `Authorization` header (required) (prefixed with ` Api-Key  `) — Type "Api-Key" followed by a space and the project API key.

## Request

### Body (application/json)

This endpoint expects a v4.LookupRequest.

- `graph_id` (string, optional) — The developer-assigned graph ID to resolve to a UUID. Mutually exclusive with user_id and thread_id.
- `thread_id` (string, optional) — The developer-assigned thread ID to resolve to a UUID. Mutually exclusive with user_id and graph_id.
- `user_id` (string, optional) — The developer-assigned user ID to resolve to a UUID. Mutually exclusive with thread_id and graph_id.

## Response

### 200

OK

- `created_at` (string, optional) — The time the thread was created.
- `graph_uuid` (string, optional) — The unique identifier of the owning user's graph.
- `thread_id` (string, optional) — The developer-assigned identifier of the thread.
- `updated_at` (string, optional) — The time the thread was last updated.
- `user_uuid` (string, optional) — The unique identifier of the user the thread belongs to.
- `uuid` (string, optional) — The unique identifier of the thread.

## Errors

### 400 Bad Request Error

Bad Request

- `error` (v4.ErrorBody, optional)

### 401 Unauthorized Error

Unauthorized

- `error` (v4.ErrorBody, optional)

### 404 Not Found Error

Not Found

- `error` (v4.ErrorBody, optional)

## Types

### v4.ErrorBody

- `code` (string, optional)
- `details` (map from string to any, optional)
- `message` (string, optional)
- `param` (string, optional)
- `request_id` (string, optional)

## Examples

**Request**

```json
{}
```

**Response**

```json
{
  "created_at": "string",
  "graph_uuid": "string",
  "thread_id": "string",
  "updated_at": "string",
  "user_uuid": "string",
  "uuid": "string"
}
```