> ## Documentation Index > Fetch the complete documentation index at: https://docs.summation.com/llms.txt > Use this file to discover all available pages before exploring further. # Withdraw queued message > Withdraw a message that is still waiting, before it runs. Requires ``confirm=true``. If the message already started, this returns a ``queued_message_already_dispatched`` conflict carrying its ``messageId`` so you can read the reply instead. Withdrawing an already-withdrawn message is a no-op success. ## OpenAPI ````yaml https://api.summation.com/openapi.json delete /v1/projects/{project_id}/conversations/{chat_id}/queue/{queued_message_id} openapi: 3.1.0 info: title: summation-api public API version: 0.1.0 servers: [] security: [] tags: - name: Auth description: Machine authentication for API clients. - name: Tenant description: Organization and tenant context resolved by summation-api. - name: Projects description: Project resources. - name: Conversations description: Conversation and message resources. - name: Reports description: Report resources and report operations. - name: Runs description: Project run history and execution status. - name: Playbooks description: Playbook resources. - name: Files description: Project file resources. - name: Catalog Entries description: Project-scoped data asset attachments. - name: Data Connectors description: Reusable external data source connections. - name: App Connectors description: External app connectors whose tools the agent can use during chat. - name: Tables description: Canonical table metadata and catalog. - name: Views description: Canonical Summation view metadata and catalog. - name: Query Executions description: Read-only SQL query execution. - name: Grid description: Materialized grid status, sync, and lineage. - name: Schedules description: Schedule and schedule run inspection. - name: Workflows description: >- Workflows: what they run, when they run, and where their output is delivered. - name: Verification Tests description: >- Administrative custom verification-test definitions, overlays, and effective-set previews. paths: /v1/projects/{project_id}/conversations/{chat_id}/queue/{queued_message_id}: delete: tags: - Conversations summary: Withdraw queued message description: >- Withdraw a message that is still waiting, before it runs. Requires ``confirm=true``. If the message already started, this returns a ``queued_message_already_dispatched`` conflict carrying its ``messageId`` so you can read the reply instead. Withdrawing an already-withdrawn message is a no-op success. operationId: withdraw_queued_message parameters: - name: project_id in: path required: true schema: type: string title: Project Id - name: chat_id in: path required: true schema: type: string title: Chat Id - name: queued_message_id in: path required: true schema: type: string title: Queued Message Id - name: confirm in: query required: false schema: type: boolean description: Set confirm=true to withdraw the queued message. Required. default: false title: Confirm description: Set confirm=true to withdraw the queued message. Required. responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/WithdrawQueuedMessageResponse' '400': description: Invalid request or unsupported option. content: application/problem+json: schema: $ref: '#/components/schemas/ProblemError' '401': description: Missing, invalid, or expired credentials. content: application/problem+json: schema: $ref: '#/components/schemas/ProblemError' '403': description: Authenticated but missing the required scope. content: application/problem+json: schema: $ref: '#/components/schemas/ProblemError' '404': description: Resource not found or not accessible. content: application/problem+json: schema: $ref: '#/components/schemas/ProblemError' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' '429': description: Rate limit exceeded. content: application/problem+json: schema: $ref: '#/components/schemas/ProblemError' '500': description: Internal server error. content: application/problem+json: schema: $ref: '#/components/schemas/ProblemError' security: - SummationMachineAuth: - agent:write components: schemas: WithdrawQueuedMessageResponse: properties: data: $ref: '#/components/schemas/WithdrawQueuedMessageData' type: object required: - data title: WithdrawQueuedMessageResponse ProblemError: description: >- Public error envelope (RFC 7807 ``application/problem+json``). Mirrors the body produced by :func:`api_error`. Declaring it in the contract lets generated clients type error handling instead of guessing. properties: type: description: URI reference identifying the problem type. title: Type type: string title: description: Short, human-readable summary of the problem type. title: Title type: string status: description: HTTP status code. title: Status type: integer detail: description: Human-readable explanation specific to this occurrence. title: Detail type: string code: description: Stable, machine-readable error code. title: Code type: string request_id: description: Correlation id, echoed in the x-request-id header. title: Request Id type: string required: - type - title - status - detail - code - request_id title: ProblemError type: object HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError WithdrawQueuedMessageData: properties: id: type: string title: Id description: The withdrawn queued message id. state: type: string title: State description: Terminal state after withdrawal (withdrawn). revision: type: integer title: Revision description: Queue version after the withdrawal. type: object required: - id - state - revision title: WithdrawQueuedMessageData ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError securitySchemes: SummationMachineAuth: type: oauth2 flows: clientCredentials: scopes: agent:read: agent:read agent:write: agent:write tokenUrl: /v1/auth/m2m/token ````