> ## Documentation Index > Fetch the complete documentation index at: https://docs.lusor.ai/llms.txt > Use this file to discover all available pages before exploring further. # Send a follow-up message to a session > Continues the session with a new prompt on the same transcript. The follow-up runs on the session's phone (for an agent's session, the phone the agent has now). If the session is still running, the follow-up is queued behind it (`queued: true`) and runs when the current run ends. Continuing a finished session is allowed. Send an `Idempotency-Key` header to make retries safe: the same key attaches to the original follow-up instead of sending a second one. Workspace scope: `workspaceId` in the body, otherwise the workspace bound to the API key. ## OpenAPI ````yaml /api-reference/openapi.yaml post /v1/sessions/{id}/continue openapi: 3.1.0 info: title: Lusor API version: 0.1.0 description: | Run AI agents on real phones, or drive a phone directly with deterministic actions. ## Authentication Every `/v1/*` endpoint except `GET /v1/health` requires an API key. Create one in the Lusor dashboard under **Settings → API Keys**. A key is shown once and is bound to one workspace. Revoking it there stops it working immediately. Send it in either header: - `X-Api-Key: ` - `Authorization: Bearer ` Because a key is bound to its workspace, `workspaceId` query and body parameters are optional for API-key callers. A request that names a different workspace returns an opaque `404`. ## Runs Use `POST /v1/agents/{id}/turns` to start or continue an agent run. Read the run under `/v1/sessions/{id}`; poll `GET /v1/sessions/{id}/status` or `GET /v1/sessions/{id}/events` for progress. ## Errors Errors are JSON: `{ "error": "", "message": "" }`. A request that fails validation returns `400` in one of two shapes, depending on the endpoint: `{ "error": "validation_error", "details": { ... } }` (direct phone control actions, for example), or `{ "error": "bad_request", "message": "" }` (agent endpoints, for example). Branch on `error`. contact: name: Lusor url: https://lusor.ai license: name: Proprietary url: https://lusor.ai/terms servers: - url: https://api.lusor.ai description: Production security: - ApiKey: [] - BearerAuth: [] tags: - name: Agents description: Persistent agents, the phone each one uses, and their turns (runs). - name: Secrets description: | Secrets saved in a workspace (passwords, sign-in details). A run uses them by name through `secrets`; values never travel in a request. - name: Sessions description: | Run records: list, inspect, stop, and read events and artifacts. Start a run with `POST /v1/agents/{id}/turns`, or without an agent through `POST /v1/workspaces/{workspaceId}/devices/{deviceId}/sessions`. - name: LiveView description: | View-only WebRTC live view of a session's phone: signaling, ICE servers, and stream control. API keys get live view only on the customer's own phone, not on a Lusor Phone. - name: Devices description: | The phones in your workspace, and reads of their current screen and UI tree. - name: DeviceVerbs description: | Direct phone control: deterministic actions (tap, swipe, type, key, clear, back, home, recent, screenshot, apps/start, apps/stop) and chains of them. On a Lusor Phone, API-key calls meter phone minutes. - name: Shell description: | Restricted shell escape hatch. Commands are checked against a denylist and audit-logged. No command output is returned. - name: Datasets description: Lists a run produced, saved as reusable Datasets. - name: Skills description: Reusable automation skills (Markdown documents). - name: PhoneNumbers description: | Workspace phone numbers and their stored SMS messages. Read-only for API keys. - name: Emails description: | Workspace Agent Mail addresses and stored inbound mail. Read-only: there is no compose, reply, or send endpoint, and message bodies are returned as raw plain text without HTML execution, remote asset fetches, or code extraction. - name: Workspaces description: The workspace an API key is bound to. - name: Catalog description: The catalog of apps that can be installed on a Lusor Phone. - name: Health description: Service health check. paths: /v1/sessions/{id}/continue: post: tags: - Sessions summary: Send a follow-up message to a session description: | Continues the session with a new prompt on the same transcript. The follow-up runs on the session's phone (for an agent's session, the phone the agent has now). If the session is still running, the follow-up is queued behind it (`queued: true`) and runs when the current run ends. Continuing a finished session is allowed. Send an `Idempotency-Key` header to make retries safe: the same key attaches to the original follow-up instead of sending a second one. Workspace scope: `workspaceId` in the body, otherwise the workspace bound to the API key. operationId: continueSession parameters: - $ref: '#/components/parameters/SessionId' - $ref: '#/components/parameters/IdempotencyKey' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ContinueSessionInput' responses: '202': description: Follow-up accepted, dispatched or queued content: application/json: schema: $ref: '#/components/schemas/ContinueSessionResult' '400': description: | `bad_request`: `prompt` is missing or empty, `maxDurationSecs` is not a positive integer, no workspace could be resolved, or the session is not bound to a device. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': $ref: '#/components/responses/Unauthorized' '402': description: | `credits_exhausted`: the workspace is out of credits. `billing_required`: the session's Lusor Phone is not covered by an active paid plan. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': $ref: '#/components/responses/NotFound' '409': description: | The follow-up cannot run now. `agent_needs_device`: the session's agent has no phone attached. `recording_required`: the agent session started without recording; start a new turn instead. `device_busy`: the phone is being reset or updated. `trial_phone_unavailable`: the trial phone this session ran on is no longer available. `internet_route_inactive`: the Lusor Phone's Internet connection is not active yet. `device_releasing`: the phone is being removed from the Phone plan. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: >- `device_busy`: the phone is running a different session; stop it first. content: application/json: schema: $ref: '#/components/schemas/Busy' '502': description: | `upstream_error` or `dispatch_outcome_unknown`. With `dispatch_outcome_unknown` the follow-up may have been accepted; retry with the same `Idempotency-Key`. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: parameters: SessionId: name: id in: path required: true schema: type: string description: Session ID. IdempotencyKey: name: Idempotency-Key in: header schema: type: string maxLength: 256 description: | Caller-provided key for safe retries. The same key in the same workspace yields the same run id, and a duplicate POST within the retention window returns the original run instead of starting a second one. schemas: ContinueSessionInput: type: object required: - prompt properties: prompt: type: string minLength: 1 description: The follow-up message. maxDurationSecs: type: integer minimum: 1 description: >- Optional cap on the follow-up run's duration, in seconds. The server applies its own upper bound. workspaceId: type: string format: uuid description: Optional for workspace-scoped API keys. ContinueSessionResult: type: object required: - id - status - deviceId - workspaceId properties: id: type: string description: The session id (unchanged). status: type: string enum: - queued deviceId: type: string workspaceId: type: string format: uuid invocationId: type: string description: | The follow-up's invocation. Absent when an `Idempotency-Key` matched a follow-up that has already run. queued: type: boolean description: | `true` when the follow-up waits behind the session's current run. Cancel it with `DELETE /v1/sessions/{id}/queue/{invocationId}`. queuedEventId: type: string description: Id of the `followup_queued` event, when `queued` is true. ErrorResponse: type: object required: - error - message properties: error: type: string message: type: string Busy: type: object description: | A `429` refusal. `device_busy` carries `currentSessionId` (the run holding the phone); `cap_busy` does not. Any authenticated request can also get `rate_limit_exceeded` when the API's request rate limit is exceeded; it comes with a `Retry-After` header in seconds. required: - error properties: error: type: string enum: - device_busy - cap_busy - rate_limit_exceeded currentSessionId: type: - string - 'null' message: type: string responses: Unauthorized: description: Authentication required or invalid credentials. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' NotFound: description: Resource not found. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' securitySchemes: ApiKey: type: apiKey in: header name: X-Api-Key description: Workspace API key, created in the dashboard under Settings → API Keys. BearerAuth: type: http scheme: bearer description: >- The same workspace API key, sent as `Authorization: Bearer `. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.