> ## Documentation Index > Fetch the complete documentation index at: https://docs.tryreplicas.com/llms.txt > Use this file to discover all available pages before exploring further. # Send Workspace Chat Message > Accepts a message immediately. Messages sent while a workspace is preparing or sleeping are queued server-side and delivered in order after startup completes. Archived and error workspaces return 409. ## OpenAPI ````yaml /openapi.json post /v1/workspaces/{workspaceId}/chats/{chatId}/messages openapi: 3.1.0 info: title: Replica API version: 2.0.0 description: >- The Replica API allows you to programmatically manage cloud workspaces for AI agents. Use this API to manage environments (the org-scoped primitive workspaces are created from — including variables, files, skills, MCPs, warm hooks, start hooks, and warm pools), create and manage replicas, send messages, manage chats, stream events, read connected repositories and repository sets, and configure automations. servers: - url: https://api.tryreplicas.com description: Production API security: - apiKey: [] tags: - name: Environments description: >- Manage environments — the primitive that workspaces are created from. Variables, files, skills, MCPs, warm-hooks, and warm-pools are all scoped to an environment. Every organization has a singleton Global environment whose values apply to every workspace. Personal environments are scoped to the authenticated user and can be standalone or source-backed by a team environment. - name: Repository description: >- Read repositories and repository sets connected to your organization. Repositories are the underlying GitHub-connection layer; bind them to an environment to use them in workspaces. - name: Replica description: Manage replicas (workspaces) for AI agents - name: Terminal description: Manage interactive terminal sessions in active workspaces - name: Preview description: Manage public preview URLs for workspace ports - name: Profile description: Read and update the authenticated user's profile - name: Credentials description: >- Manage coding-agent credentials for an organization or the authenticated user - name: Google Search Console description: >- Read Search Console properties, performance, sitemaps, and URL inspection results through a connected Google account - name: Slack description: Route Slack threads to Replicas workspaces - name: Automation description: >- Create and manage automations that trigger replicas on a schedule or in response to events - name: Downloads description: Download Replicas applications - name: Analytics description: >- Read aggregated activity and usage metrics for your organization: compute minutes, workspaces created by source, and pull request throughput over a time range. paths: /v1/workspaces/{workspaceId}/chats/{chatId}/messages: post: tags: - Replica summary: Send Workspace Chat Message description: >- Accepts a message immediately. Messages sent while a workspace is preparing or sleeping are queued server-side and delivered in order after startup completes. Archived and error workspaces return 409. operationId: sendWorkspaceChatMessage parameters: - name: workspaceId in: path required: true schema: type: string format: uuid - name: chatId in: path required: true schema: type: string format: uuid requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SendWorkspaceChatMessageRequest' responses: '200': description: Message accepted by an active workspace content: application/json: schema: $ref: '#/components/schemas/SendWorkspaceChatMessageResponse' '202': description: Message queued while the workspace starts content: application/json: schema: $ref: '#/components/schemas/SendWorkspaceChatMessageResponse' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' '409': $ref: '#/components/responses/Conflict' '500': $ref: '#/components/responses/InternalServerError' components: schemas: SendWorkspaceChatMessageRequest: type: object properties: message: type: string messageId: type: string submittedAt: type: string format: date-time model: type: string images: type: array items: $ref: '#/components/schemas/ImageContent' planMode: type: boolean goalMode: type: boolean fastMode: type: boolean thinkingLevel: type: string enum: - low - medium - high - xhigh - max - ultra - ultracode required: - message SendWorkspaceChatMessageResponse: type: object properties: messageId: type: string queued: type: boolean position: type: integer required: - messageId - queued - position ImageContent: type: object description: An image attachment for messages properties: type: type: string const: image description: Content type, always 'image' source: type: object description: Image source data oneOf: - type: object properties: type: type: string const: base64 media_type: type: string enum: - image/png - image/jpeg - image/gif - image/webp description: MIME type of the image data: type: string description: Base64-encoded image data required: - type - media_type - data - type: object properties: type: type: string const: url url: type: string format: uri description: URL to the image required: - type - url required: - type - source Error: type: object properties: error: type: string description: Error message details: type: - string - 'null' description: Additional error details required: - error responses: BadRequest: description: Bad request - Missing or invalid parameters content: application/json: schema: $ref: '#/components/schemas/Error' Unauthorized: description: Unauthorized - Invalid or missing API key content: application/json: schema: $ref: '#/components/schemas/Error' NotFound: description: Resource not found content: application/json: schema: $ref: '#/components/schemas/Error' Conflict: description: >- Conflict - Resource already exists or operation conflicts with current state content: application/json: schema: $ref: '#/components/schemas/Error' InternalServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: apiKey: type: http scheme: bearer description: >- API key authentication. Obtain your API key from the Replicas dashboard under Organization → Settings → API Keys. ````