> ## Documentation Index > Fetch the complete documentation index at: https://docs.labelbox.com/llms.txt > Use this file to discover all available pages before exploring further. # Interrupt a session and send a replacement instruction > Stops active work and durably accepts a replacement instruction in one ordered operation. The session starts a fresh turn automatically. A session started before replacement instructions were available still honors the interrupt and keeps the replacement for its next resume. ## OpenAPI ````yaml /managed-agents/openapi.yaml post /managed-agents/v1/sessions/{session_id}/interrupt-and-send openapi: 3.1.0 info: title: Managed Agents API version: 0.14.0 description: >- The Recursion Managed Agents REST API. Authenticate with a Recursion API key as a bearer token. An organization-scoped key acts in its own organization and needs nothing else; a tenant-scoped key must also send `x-organization-id` with an organization id or `default`. Field names follow each operation's published schema. servers: - url: https://api.recursion.labelbox.com security: - bearerAuth: [] paths: /managed-agents/v1/sessions/{session_id}/interrupt-and-send: post: tags: - Sessions summary: Interrupt a session and send a replacement instruction description: >- Stops active work and durably accepts a replacement instruction in one ordered operation. The session starts a fresh turn automatically. A session started before replacement instructions were available still honors the interrupt and keeps the replacement for its next resume. operationId: managedAgentsInterruptAndSendSessionMessage parameters: - description: Session id (UUID) as returned by startSession or listSessions. in: path name: session_id required: true schema: description: Session id (UUID) as returned by startSession or listSessions. format: uuid type: string requestBody: content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsInterruptAndSendRequest' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsEventsAcceptedResponse' description: >- Shared response body of POST /v1/sessions/{session_id}/events and POST /v1/sessions/{session_id}/interrupt-and-send. It acknowledges durable acceptance of the turn, never the agent's reply: read the reply by listing events or streaming. Compare events_accepted against what was sent to detect silently dropped entries, and read delivery_state to learn whether an agent is actually going to act on them. events_accepted counts canonical events rather than requests, so interrupt-and-send reports 2 for its single instruction: the stop and the message that follows it. '400': description: The request was rejected by schema or semantic validation. content: application/json: schema: oneOf: - $ref: '#/components/schemas/ManagedAgentsApiErrorInvalidJson' - $ref: '#/components/schemas/ManagedAgentsApiErrorInvalidRequest' discriminator: propertyName: code mapping: invalid_json: $ref: '#/components/schemas/ManagedAgentsApiErrorInvalidJson' invalid_request: $ref: '#/components/schemas/ManagedAgentsApiErrorInvalidRequest' '401': description: The caller is unauthenticated. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorUnauthorized' '403': description: The caller lacks a required permission or capability. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorForbidden' '404': description: No such resource is reachable for this caller. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorNotFound' '409': description: >- The request conflicts with the resource state, or with an in-flight idempotent replay. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorConflict' '413': description: The request exceeds a size or transaction budget. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorPayloadTooLarge' '415': description: The request body uses a media type this operation does not accept. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorUnsupportedMediaType' '429': headers: Retry-After: description: When to retry, as delay seconds or an HTTP date. schema: type: string description: A rate limit is exhausted. Honor `Retry-After`. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorRateLimitExceeded' '500': description: An unexpected server-side failure. content: application/json: schema: oneOf: - $ref: '#/components/schemas/ManagedAgentsApiErrorInternalError' - $ref: >- #/components/schemas/ManagedAgentsApiErrorInvariantViolation discriminator: propertyName: code mapping: internal_error: $ref: '#/components/schemas/ManagedAgentsApiErrorInternalError' invariant_violation: $ref: >- #/components/schemas/ManagedAgentsApiErrorInvariantViolation '502': description: The service returned an invalid response. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorBadGateway' '503': description: >- A dependency is unavailable. Consult details.retryable and Retry-After when present before retrying. content: application/json: schema: oneOf: - $ref: >- #/components/schemas/ManagedAgentsApiErrorContentStoreUnavailable - $ref: >- #/components/schemas/ManagedAgentsApiErrorContentStoreUnconfigured - $ref: >- #/components/schemas/ManagedAgentsApiErrorFileStorageUnconfigured - $ref: >- #/components/schemas/ManagedAgentsApiErrorManagedAgentsUnavailable - $ref: '#/components/schemas/ManagedAgentsApiErrorPersistenceBusy' - $ref: >- #/components/schemas/ManagedAgentsApiErrorServiceUnavailable discriminator: propertyName: code mapping: content_store_unavailable: $ref: >- #/components/schemas/ManagedAgentsApiErrorContentStoreUnavailable content_store_unconfigured: $ref: >- #/components/schemas/ManagedAgentsApiErrorContentStoreUnconfigured file_storage_unconfigured: $ref: >- #/components/schemas/ManagedAgentsApiErrorFileStorageUnconfigured managed_agents_unavailable: $ref: >- #/components/schemas/ManagedAgentsApiErrorManagedAgentsUnavailable persistence_busy: $ref: >- #/components/schemas/ManagedAgentsApiErrorPersistenceBusy service_unavailable: $ref: >- #/components/schemas/ManagedAgentsApiErrorServiceUnavailable '504': description: The service did not respond before the timeout. content: application/json: schema: $ref: '#/components/schemas/ManagedAgentsApiErrorGatewayTimeout' components: schemas: ManagedAgentsInterruptAndSendRequest: description: >- Request body for interrupting the active operation and starting a fresh turn with one replacement instruction. properties: content: description: >- Provider-shaped replacement instruction blocks, passed through verbatim, except that a top-level image or document block may name a file from the organization's catalog with source {type: file, file_id}, resolved exactly as on sendSessionEvents; a refusal names the block as content[j]. Takes precedence over message. items: $ref: '#/components/schemas/ManagedAgentsContentBlockRequest' type: - array - 'null' message: description: >- Replacement instruction for the fresh turn. Ignored when content is present. type: string referenced_session_ids: description: >- Prior sessions this session may read from the fresh turn on, by session id, added to any it already has. Authorized and recorded before the interrupt is signaled, so redirecting the agent at an earlier run is one request rather than two. items: type: string maxItems: 10 type: array type: object example: content: - byte_size: 1 content: [] context: example data: example encrypted_content: example height: 1 id: 9f8b1c2d-3e4f-5a6b-7c8d-9e0f1a2b3c4d input: key: example is_error: true media_type: example name: example-name omitted_bytes: 1 payload: example provider: example provider_payload: example redacted: true semantic_hint: example sha256: example signature: example source: file_id: 9f8b1c2d-3e4f-5a6b-7c8d-9e0f1a2b3c4d type: file summary: [] text: example title: example tool_use_id: 9f8b1c2d-3e4f-5a6b-7c8d-9e0f1a2b3c4d type: example uri: example url: https://example.com url_expires_at: '2026-02-18T09:30:00.000Z' width: 1 message: example referenced_session_ids: - example ManagedAgentsEventsAcceptedResponse: description: >- Shared response body of POST /v1/sessions/{session_id}/events and POST /v1/sessions/{session_id}/interrupt-and-send. It acknowledges durable acceptance of the turn, never the agent's reply: read the reply by listing events or streaming. Compare events_accepted against what was sent to detect silently dropped entries, and read delivery_state to learn whether an agent is actually going to act on them. events_accepted counts canonical events rather than requests, so interrupt-and-send reports 2 for its single instruction: the stop and the message that follows it. properties: delivery_state: description: >- How the accepted events reached a reader. queued: the agent was mid-turn, so the input is waiting outside the transcript and the next turn boundary will read it; interrupt to bring that forward. signaled: the running session was woken and will act on them. resumed: the session had already finished, so it resumed to act on them. stored: appended to the timeline with nothing running to act on them yet. enum: - stored - signaled - resumed - queued type: string events_accepted: description: >- How many canonical events were written or queued. This counts the inputs actually derived from the body, not its length: a plain message body yields 1, and a typed event with an unrecognised type or no content is dropped, so this can be lower than the events array sent. type: integer ok: description: >- Always true. Every event in the request was durably accepted; any partial or total failure is an HTTP error instead, so this field never reports false. type: boolean required: - ok - delivery_state - events_accepted type: object example: delivery_state: stored events_accepted: 1 ok: true ManagedAgentsApiErrorInvalidJson: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - invalid_json message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorInvalidRequest: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - invalid_request message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorUnauthorized: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - unauthorized message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorForbidden: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - forbidden message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorNotFound: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - not_found message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorConflict: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - conflict message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorPayloadTooLarge: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - payload_too_large message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorUnsupportedMediaType: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - unsupported_media_type message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorRateLimitExceeded: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - rate_limit_exceeded message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorInternalError: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - internal_error message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorInvariantViolation: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - invariant_violation message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorBadGateway: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - bad_gateway message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorContentStoreUnavailable: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - content_store_unavailable message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorContentStoreUnconfigured: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - content_store_unconfigured message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorFileStorageUnconfigured: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - file_storage_unconfigured message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorManagedAgentsUnavailable: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - managed_agents_unavailable message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorPersistenceBusy: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - persistence_busy message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorServiceUnavailable: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - service_unavailable message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsApiErrorGatewayTimeout: type: object properties: code: type: string minLength: 1 description: Stable machine-readable error code. enum: - gateway_timeout message: type: string minLength: 1 description: Human-readable error message. details: $ref: '#/components/schemas/ManagedAgentsApiErrorDetails' description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. required: - code - message additionalProperties: false description: Standard flat error response. ManagedAgentsContentBlockRequest: description: >- One block of message content: text, image, tool_use, tool_result, thinking, or a provider passthrough. The type field says which fields apply, and provider-native payloads are carried through verbatim. properties: byte_size: description: Decoded image byte size. format: int64 type: integer content: description: >- Nested blocks carrying a tool_result payload, so a tool can return both text and images. items: $ref: '#/components/schemas/ManagedAgentsContentBlockRequest' type: array context: description: >- A document block's context: what the model should know about the document before reading it, disclosed as its first paragraph. type: string data: description: >- Base64 image bytes. Omitted from default reads and present only for legacy storage or explicit hydrate=images responses. type: string encrypted_content: description: >- Sealed reasoning payload for providers that return reasoning encrypted. Opaque to clients; replay it verbatim. type: string height: description: Validated image height in pixels. type: integer id: description: >- Provider-assigned id of a tool_use block. Echo it back as tool_use_id on the matching tool_result. type: string input: additionalProperties: {} description: >- Tool arguments the model produced for a tool_use block, matching that tool's input schema. type: object is_error: description: >- True when a tool_result reports that the tool call failed; the nested content then carries the error detail. type: boolean media_type: description: >- Declared media type; inline computer-use images allow image/jpeg, image/png, and image/webp. type: string name: description: Name of the tool the model is invoking, on a tool_use block. type: string omitted_bytes: description: Original byte count reported by a redacted image placeholder. format: int64 type: integer payload: description: >- Provider-native block body, stored verbatim for block types this schema does not model. Passed through unchanged. provider: description: >- Provider that emitted a passthrough block, e.g. anthropic or openai, telling readers how to interpret payload. type: string provider_payload: description: >- Original provider block exactly as received, kept alongside the normalized fields for lossless replay. redacted: description: >- True when the block's content was withheld (redacted thinking, or an image dropped by redaction); the remaining fields describe what was removed. type: boolean semantic_hint: description: >- Coarse hint about what an unmodeled provider block represents, so a reader can render it without provider-specific logic. type: string sha256: description: Lowercase SHA-256 digest of decoded image bytes. type: string signature: description: >- Provider-issued signature over a thinking block, or the thought signature a Gemini tool_use block was issued with, required for the provider to accept that block on a later turn. Opaque; replay it verbatim. type: string source: $ref: '#/components/schemas/ManagedAgentsContentBlockSource' description: >- Where a user-sent image or document block's bytes came from when they were named rather than sent inline: {type: "file", file_id}. Kept on the stored block as provenance after the bytes were copied into the session; an image block then also carries the session's own uri. summary: description: >- Readable summary blocks a provider returns alongside sealed or long-form reasoning. items: $ref: '#/components/schemas/ManagedAgentsContentBlockRequest' type: array text: description: Text of a text block, or the reasoning text of a thinking block. type: string title: description: >- A document block's title, disclosed to the model beside the document. type: string tool_use_id: description: Id of the tool_use block that this tool_result answers. type: string type: description: >- Block discriminator: text, image, document (a user-sent block naming a file by id, inlined as text when the message is accepted), tool_use, tool_result, thinking, redacted_thinking, or a provider passthrough type. Which of the other fields apply depends on this value. type: string uri: description: >- Private typed content reference. Fetch it through getSessionImage; clients cannot read this URI directly. type: string url: description: >- Short-lived HTTPS URL for the image bytes. Present only when the read asked for image_urls=signed and the deployment has signing configured. Never stored; fetch a fresh read after url_expires_at. type: string url_expires_at: description: When url stops working. Absent whenever url is. format: date-time type: - 'null' - string width: description: Validated image width in pixels. type: integer type: object example: byte_size: 1 content: [] context: example data: example encrypted_content: example height: 1 id: 9f8b1c2d-3e4f-5a6b-7c8d-9e0f1a2b3c4d input: key: example is_error: true media_type: example name: example-name omitted_bytes: 1 payload: example provider: example provider_payload: example redacted: true semantic_hint: example sha256: example signature: example source: file_id: 9f8b1c2d-3e4f-5a6b-7c8d-9e0f1a2b3c4d type: file summary: [] text: example title: example tool_use_id: 9f8b1c2d-3e4f-5a6b-7c8d-9e0f1a2b3c4d type: example uri: example url: https://example.com url_expires_at: '2026-02-18T09:30:00.000Z' width: 1 ManagedAgentsApiErrorDetails: type: object properties: field: description: >- Request field or header responsible for the error, when one can be identified. type: string issues: description: >- Boundary-validation failures as path-prefixed human-readable messages. type: array items: type: string requestId: description: Request correlation identifier for support and log lookup. type: string retryable: description: >- Server advice about failure transience. `true` means transient, `false` means non-transient, and absence gives no advice. Automatic replay is allowed only when this field is not `false` and the operation-specific retry and idempotency contract permits replay. type: boolean additionalProperties: {} description: >- Optional structured error details. Reserved transport fields are typed; code-specific fields remain forward compatible. ManagedAgentsContentBlockSource: description: >- Where a user-sent image or document block takes its bytes from when the caller names a file instead of carrying them: a file from the organization's catalog, read and copied into the session when the message is accepted, so the block the transcript keeps names both the source and the copy. properties: file_id: description: >- The file whose bytes the block carries, from the caller's organization, unexpired. type: string type: description: Always file. enum: - file type: string required: - type - file_id type: object example: file_id: 9f8b1c2d-3e4f-5a6b-7c8d-9e0f1a2b3c4d type: file securitySchemes: bearerAuth: type: http scheme: bearer description: A Recursion API key, created in the console under API keys. ````