> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xpertai.cn/llms.txt
> Use this file to discover all available pages before exploring further.

# Read thread state

> Read an existing checkpoint after a run has produced state. This is current or selected checkpoint state, not complete conversation history. Thread history and state-write APIs are not implemented in the current handler.



## OpenAPI

````yaml /api/openapi.sdk.json get /api/ai/threads/{thread_id}/state
openapi: 3.0.3
info:
  title: XpertAI SDK HTTP API
  version: 1.0.0
  description: >-
    Current HTTP endpoints used by the SDK guide. Authenticate with a
    server-side API Key using Authorization: Bearer <API_KEY> or x-api-key.
    These endpoints do not require ChatKit. The reference covers the guide
    examples, not every method exported by the SDK. Check deployment support
    before using additional fields.
servers:
  - url: https://api.xpertai.cn
    description: XpertAI API. Replace with your own API origin for private deployments.
security:
  - ApiKeyBearer: []
  - ApiKeyHeader: []
tags:
  - name: Assistants
  - name: Threads
  - name: Runs
  - name: Contexts
  - name: Store
paths:
  /api/ai/threads/{thread_id}/state:
    get:
      tags:
        - Threads
      summary: Read thread state
      description: >-
        Read an existing checkpoint after a run has produced state. This is
        current or selected checkpoint state, not complete conversation history.
        Thread history and state-write APIs are not implemented in the current
        handler.
      operationId: get_thread_state
      parameters:
        - name: thread_id
          in: path
          required: true
          schema:
            type: string
        - name: checkpoint_id
          in: query
          required: false
          schema:
            type: string
      responses:
        '200':
          description: Successful response.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ThreadState'
              example:
                values: {}
                checkpoint:
                  thread_id: 11111111-1111-4111-8111-111111111111
        '400':
          description: Invalid input, identifier mismatch or invalid operation state.
        '401':
          description: Missing or invalid API Key.
        '403':
          description: The caller cannot access the requested resource.
        '404':
          description: Resource not found or unavailable to the caller.
components:
  schemas:
    ThreadState:
      type: object
      properties:
        values:
          type: object
          additionalProperties: true
        checkpoint:
          type: object
          additionalProperties: true
        parent_checkpoint:
          type: object
          additionalProperties: true
        metadata:
          type: object
          additionalProperties: true
        created_at:
          type: string
          format: date-time
      required:
        - values
        - checkpoint
  securitySchemes:
    ApiKeyBearer:
      type: http
      scheme: bearer
      description: Server-side API Key; do not expose it in browser code.
    ApiKeyHeader:
      type: apiKey
      in: header
      name: x-api-key

````

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