> ## 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. # Create verification-test overlay > Create an add or removal overlay. Creating an op=remove overlay requires confirm=true. ## OpenAPI ````yaml https://api.summation.com/openapi.json post /v1/verification-tests/attachments 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/verification-tests/attachments: post: tags: - Verification Tests summary: Create verification-test overlay description: >- Create an add or removal overlay. Creating an op=remove overlay requires confirm=true. operationId: create_verification_test_attachment parameters: - name: confirm in: query required: false schema: type: boolean description: Set confirm=true when op=remove suppresses a resolved test ref. default: false title: Confirm description: Set confirm=true when op=remove suppresses a resolved test ref. requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VerificationTestAttachmentCreateRequest' responses: '201': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/VerificationTestAttachmentResponse' '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: VerificationTestAttachmentCreateRequest: properties: scope: type: string enum: - tenant - project - artifact title: Scope description: 'Overlay scope: tenant, project, or artifact.' scope_id: anyOf: - type: string minLength: 1 - type: 'null' title: Scope Id description: >- Project or artifact id. Omit for tenant scope, which derives the authenticated organization. subject_type: type: string enum: - html - document - deck - workbook title: Subject Type description: Artifact family this overlay affects. op: type: string enum: - add - remove title: Op description: Add a custom definition, or remove a test ref from the resolved set. custom_test_id: anyOf: - type: string minLength: 1 - type: 'null' title: Custom Test Id description: Custom definition id. Required only for op=add. target_ref: anyOf: - type: string maxLength: 255 minLength: 1 - type: 'null' title: Target Ref description: Resolved test ref to suppress. Required only for op=remove. additionalProperties: false type: object required: - scope - subject_type - op title: VerificationTestAttachmentCreateRequest VerificationTestAttachmentResponse: properties: data: $ref: '#/components/schemas/VerificationTestAttachment' type: object required: - data title: VerificationTestAttachmentResponse 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 VerificationTestAttachment: properties: id: type: string title: Id scope: type: string enum: - tenant - project - artifact title: Scope description: Scope at which this overlay is attached. scopeId: type: string title: Scopeid subjectType: type: string enum: - html - document - deck - workbook title: Subjecttype op: type: string enum: - add - remove title: Op customTestId: anyOf: - type: string - type: 'null' title: Customtestid targetRef: anyOf: - type: string - type: 'null' title: Targetref status: type: string title: Status type: object required: - id - scope - scopeId - subjectType - op - status title: VerificationTestAttachment 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 ````